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Archive 1 |
What does it mean ? What evidence is available than they are older than bacteria ? (not to mention that this word has much meaning in evolutionary biology than people use to assume based on their false vision of evolution) --Taw
They aren't any adapted bacteria. They were initially. Nowadays 95% of their structure is coded by cell nucleus, and they lost many other functions. --Taw
That's not that way. Some of them live in such environments, but many others don't.
And this sentence is sugesting that such an environment is in some way inferior to Eucaryotic environment. It would be as silly to say that fish can only survive by adopting to extreme (underwater) environment. --Taw
And it's also misleading in that some researchers theorize that those particular "extreme conditions" (hydrothermal vents) may be where life arose in the first place. In which case, non-Archaea life could only survive by adopting to extreme environments, eg. dry land and open ocean.
If i recall correctly the current picture of the tree of life (which is wobbly) has prokaryotes as the progenitors, with archaea and eukaryotes branching off at some later point. Of course, there's so much horizontal gene transfer amongst archaea/prokaryotes that it's really damn hard to say anything definitively... at any rate, I've NEVER heard that archaea came first, or that eukaryotes descended from archaea. Graft 04:53 Sep 27, 2002 (UTC)
I came here to complain about the article, and Taw wrote everything down already! Somebody needs to fix this. AxelBoldt 04:45 Sep 27, 2002 (UTC)
I came to check the original english article for somebody wanted to translate it in french, and I also came here to complain :-))
Anthere 00:06 Nov 25, 2002 (UTC)
I suspect this article is infelicitously named just as "mathematical group" was an exceedingly bad name for an article on its topic. The latter is now fortunately redirected to "group (mathematics)". No mathematician calls a group a "mathematical group", but it is within mathematics that the word "group" is used in the sense that that article contemplates. Would the same reasoning lead to the conclusion that this article should be redirected in the same way? (If so, the number of links to fix would be fairly large.) Michael Hardy 21:39 Mar 15, 2003 (UTC)
I agree that "Biological cell" is not what a biologist would name the page, but I think it makes very clear what is on the page, particularly for anyone who first goes to the "Cell" page. Why not put a brief statement near the top of the "Biological cell" page similar to what Michael Hardy wrote above? JWSchmidt 01:36 Mar 16, 2003 (UTC)
My vote would be for cell (biology). It's a little less natural to use in a sentence, but at the same time, I would expect people to use it more often regardless. Accidental links are important. There would indeed be a lot of pages to change - but surely by now someone capable has written a script for that? --Josh Grosse
Why the thumbnail near the top of the page? It's the same as the diagram lower down, but without the context that gives sense to its labels and explains what it's an example of. If we wanted to have pictures of various types of cells, I'm all for it, but I don't get this. -- Josh
Article says: humans have an estimated 100,000 billion cells? What does that mean? Billion have two meanings and I am not sure which is it. Could someone, please, correct it to the format specified in the Wikipedia:Manual of Style (dates and numbers)? Or perhaps explain if 100,000 billion = 1017 or 1014? Przepla 18:28, 4 Nov 2004 (UTC)
I just moved the article back to its original. Discuss before making a move of a large page with all those re-directs to fix. No, leave it here. Cell formation is not a good name anyway. Cell biology w/out the parens would be better, but if it is moved there is a lot of link changes to make. I vote to leave as is unless someone gives some very good reasons. Vsmith 21:36, 9 Feb 2005 (UTC)
While I was reading through the article, I fixed things that I knew were wrong, but I also found a few things that don't seem to fit with what I know about cells, where I was too unsure to change them. I thought maybe you'd know:
I'll put up more questions when I finish the article. Thanks in advance for your help. Dave (talk) 12:01, Jun 17, 2005 (UTC)
To anwser the questions so far:
--nixie 05:51, 18 Jun 2005 (UTC)
Thanks for your help. Note to self: I still need to deal with the transcription one, the "this could be clearer" one, aand the "architectural regions" one. Dave (talk) 12:27, Jun 18, 2005 (UTC)
All organisms use vesicles to transport proteins etc from the ER to the membrane and other compartments. Prokaryotes don't have an ER. Josh Cherry 12:46, 18 Jun 2005 (UTC)
I read recently a theory suggesting that the first cells evolved from the bubbles of crashing waves on the shores of the ancient ocean. If I can provide the source, and perhaps a more detailed account of the theory, would it be worth mentioning in the 'cell origins' section? - R Lee E (talk, contribs) 21:15, August 22, 2005 (UTC)
....proteinoids are observed by heating amino acids with phosphoric acid as a catalyst. They bear much of the basic features provided by cell membranes. Proteinoid-based protocells enclosing RNA molecules could (but not necessarily should) have been the first cellular life forms on Earth.
Another theory holds that the turbulent shores of the ancient costal waters may have served as a mammoth labratory, aiding in the countless experiments necessary to bring about the first cell. Waves breaking on the shore create a delicate foam composed of bubbles. Winds sweeping across the ocean have a tendancy to drive things to shore, much like driftwood collecting on the beach. It is possible that organic molecules were concentrated on the shorelines in much the same way. Shallow coastal waters also tend to be warmer, further concentrating the molecules through evaporation. While bubbles comprised of mostly water tend to burst quickly, oily bubbles happen to be much more stable, lending more time to the particular bubble to perform these crucial experiments. The Phospholipid is a good example of a common oily compound prevalent in the prebiotic seas. Phospholipids can be constructed in ones mind as a hydrophilic head on one end, and a hydrophobic tail on the other. Phospholipids also possess an important characteristic, that is being able to link together to form either a monolayer, or a bilayer bubble membrane. A lipid monolayer bubble can only contain oil, and is therefore not conducive to harbouring water-soluble organic molecules. On the other hand, a lipid bilayer bubble [1] can contain water, and was a likely precursor to the modern cell membrane. If a protein came along that increased the integrity of its oily bubble, then that bubble had an advantage, and was placed at the top of the natural selection waiting list. Primitive reproduction can be envisioned when the bubbles burst, releasing the results of the experiment into the surrounding medium. Once enough of the 'right stuff' was released into the medium, the development of the first prokaryotes, eukaryotes, and multi-celluar organisms could be acheived. This theory is expanded upon in the book, "The Cell: Evolution of the First Organism" by Joseph Panno Ph.D.
Your contributions are welcome ofcourse. - R Lee E (talk, contribs) 07:36, August 24, 2005 (UTC)
It sounds quite speculative, but I'll let the other editors decide whether it merits inclusion. I've made some general language edits to improve NPOV, though.
Another theory holds that the turbulent shores of the ancient costal waters may have served as a mammoth labratory, aiding in the countless experiments necessary to bring about the first cell. Waves breaking on the shore create a delicate foam composed of bubbles. Winds sweeping across the ocean have a tendancy to drive things to shore. It is possible that organic molecules were concentrated on the shorelines in much the same way. Shallow coastal waters also tend to be warmer, further concentrating the molecules through evaporation. While bubbles comprised of mostly water tend to burst quickly, oily bubbles happen to be much more stable, lending more time to the particular bubble to perform these crucial experiments. The Phospholipid is an example of a common oily compound prevalent in the prebiotic seas. Phospholipids can be constructed in ones mind as a hydrophilic head on one end, and a hydrophobic tail on the other. Phospholipids also possess an important characteristic, that is being able to link together to form either a monolayer, or a bilayer bubble membrane. A lipid monolayer bubble can only contain oil, and is therefore not conducive to harbouring water-soluble organic molecules. On the other hand, a lipid bilayer bubble [2] can contain water, and was a likely precursor to the modern cell membrane. If a protein came along that increased the integrity of its oily bubble, then that bubble had an advantage, and was placed at the top of the natural selection waiting list. Primitive reproduction can be envisioned when the bubbles burst, releasing the results of the experiment into the surrounding medium.
--causa sui talk 18:08, 25 August 2005 (UTC)
While we are talking about theories, I have one for everybody: Cells were created by God only about 6,000 years ago when the first multicellular organism (plants) were created. I can see people already criticizing me for bringing this up, but what better explanation can there be? How do you get inorganic chemicals to turn into a form of life? Not even organic chemicals help out since most are actually lethal to life! How would a bubble help create a cell? Even if this bubble has all of the necessary requirements to create a cell, how would you be able to have all of the parts (including the nucleus) put into a working order without a single mistake? I do not think chance is going to help at all with that. Another thing, how does DNA fit into a cell's nucleus if chance took place? A single strand of DNA from one cell inside a human's body is said to be about 6 feet long while the cell itself cannot even be seen as a microscope. I know I am not yet a scientist and I still need to do more research, but seriouly, the ideas that were given in your origin sections have many complicated issues. Why can you not also add the theory of God creating cells as another theory (yes, some scientists do hold this as not only a theory but a fact)? You should not just hold an evolutionist's theory and hide a creationist's theory. That is being biased against a certain group. I do not want you to reply back that creationists are not scientists because there are actually a lot of scientists who are actually abandoning the evolution theory and going with creation (and I am talking about professional scientists). If you need sources on those scientists, I am willing to link them. Please do not just show one side of the argument, but show both. Thank you.
LOAP —Preceding unsigned comment added by 71.245.58.82 (talk) 21:53, 9 June 2009 (UTC)
"It [linked video] is not intended as a sacrilege of the poetic beauty of Genesis:rather it is a mere extension of what the creationists have already done to Genesis in their insistence that it be read not as mythic saga but as scientific prose". David D. (Talk) 05:22, 11 June 2009 (UTC)
Just to let you know, that guy has no real basic reason to interpret Genesis like that. First thing you have to realize about that guy is that he is an athiest and will of course try to downplay the reliabilty of Genesis. Second, to do any translation of the Bible, you must start with the original Greek, Hebrew, and Aramic language (which can be found in concordences). Third, Genesis is not a myth; it is written history of God about the creation, man's fall, the first promise of the redeemer, the catastrophic flood, the confusion of languages at the tower of Babel, the choosing of the Jewish nation to preserve the promised seed, etc. Genesis is more important than that guy makes it, and it sickens me to see some so called "expert" or "scientist" try to attack it. But to be honest, I am not surprised, because if you look at certain texts of the Bible, God tells us there will be people who scoff at the beginnings and claim that everything we see now always took place (look in 2 Peter 3). It is no surprise that that guy is trying to refute Scripture and is no surprise if you criticize me even in the future because God prophecied that would happened at least over 1,500 years ago when 2 Peter was written.
Please, if you want to against Genesis, I suggest you take your time READING it using a concordence to find the meaning of certian Hebrew words (like day which is always a word that gets hit hard by progressive creationists and evolutionists). Do not rely on some athiest who has all intention to turn everybody away from the Bible. Study it yourself! I pray that God's Spirit will help you understand the meaning of the text. The text itself is writeen so that anyone can understand it and to be taken literally. I really do not see how hard it is to understand Scripture when it says God created the earth in 6 literal days.
As for the cells, if you believe that God created everything in 6 days, than it is no problem to consider when cells came about. The earliest record of any living organism recorded in Genesis is on day three when land was made and plants were created. Now I understand that Genesis does not record when microbes and single celled organisms were made, but you must realize that when Genesis was first written to the Jews, they did not have microscopes to see single celled organisms nor did it really matter since humanity spent most of its time not knowing of bacteria. I myself believe single celled organisms were made on day three with plants (and these organisms were not harmful, but beneficail), but that is my own opinion and not actual fact in Scripture. If you have more questions on these topics, please try looking at www.icr.org or www.answersingenesis.org or www.godandscience.org
These websites were created by people who are both scientists and born again Christians who dedicate their time to answer questions such as cells. Please look them up before asking any other questions. Now let us see if I get any nasty comments this time. LOAP
what stores the energy in cells. If the mitochondria creats the energy where does it go to awate use. is it used otomaticaly or is it stored somewhere. This was unclear to me. If you can answer my question thak you. Oh and people stop conplaining.(69.154.246.64 04:06, 13 December 2005 (UTC)) Benerally, it is stored in the form of glicoe. When the energy is needed, glicose is used to produce ATP, and the ATP is used "power-up" some quemical reactions. while that, I think that ATP os free on the citoplasm, like the NaCl in a solution. I THINK that's how it work's, but I'm not shure. algumacoisaqq 13:27, 13 December 2005 (UTC)
This --> ATP is a link to the specific ATP article you want. There are some other "energy rich" chemicals that also act to store the chemical energy from mitochondria. Wikipedia needs a better article on bioenergetics. text book --JWSchmidt 13:53, 13 December 2005 (UTC)
Dictionary. 142.59.172.187 20:15, 29 May 2007 (UTC)
This was todo question. Can be confirmed from various sources, e.g. [3] [4] [5] [6] Lejean2000 13:11, 10 February 2006 (UTC)
We should make an effort to provide up-to-date references at Cytoskeleton#The prokaryotic cytoskeleton and related pages. --JWSchmidt 16:00, 10 February 2006 (UTC)
Would somone who knows more biology than please check this table for accuracy. It has vacuoles in the animal cell section. I'm pretty sure they should be in the plant cell section. Theresa Knott | Taste the Korn 16:10, 23 February 2006 (UTC)
I think some description of how the cell works in the ECM should be added here, or at least a link to ECM. 128.139.226.37 15:48, 31 May 2006 (UTC)
I don't like this section. It only covers cancer, while arguably, most diseases are diseases of the cell... Extracellular parasites are the only exception that comes to mind at the moment. For example, any virus-mediated disease is a disease of the cell, as viruses replicate inside cells. Would anyone mourn this section's passing? Peter Z.Talk 21:21, 16 June 2006 (UTC)
For an article of this length and about a scientific subject there should be a mass of references; instead there's only one. Some work needed! Would it be useful to go through the article indicating useful points to insert them??GiollaUidir 23:12, 18 June 2006 (UTC)
The peer review of this article is a little old and stale, so I'll post here that I posted there in case nobody's reading the peer review subpage anymore. Opabinia regalis 08:35, 1 July 2006 (UTC)
I have removed this section, as havng a whole section for one statistic that was already in the intro was pointless Jnb 11:17, 7 August 2006 (UTC)
Somehow the German version of the picture below has no vacuole but calls it Microbody and 10 an 12 are mixed.
. I am no cell biologist, so what is correct now, or are both correct and have one missing?
your welcome to use this diagram instead. I can label it if you want. It has a vacuole over in the left hand side of the picture. Its a non-specific cell, e.g. it has visible centrioles and a chloroplast. It was drawn to replace that diagram above.
dont know if tis is the right place to complain, but something is wrong with the printable version. the first part of the text in the printable version only fills the left half of the pages (or the bottom parts are to wide dont know). anyways it looks really weird when printed... thanks for help - 85.220.132.38 12:02, 28 October 2006 (UTC)
Members of the Wikipedia:WikiProject Good articles are in the process of doing a re-review of current Good Article listings to ensure compliance with the standards of the Good Article Criteria. (Discussion of the changes and re-review can be found here). A significant change to the GA criteria is the mandatory use of some sort of in-line citation (In accordance to WP:CITE) to be used in order for an article to pass the verification and reference criteria. Currently this article does not include in-line citations. It is recommended that the article's editors take a look at the inclusion of in-line citations as well as how the article stacks up against the rest of the Good Article criteria. GA reviewers will give you at least a week's time from the date of this notice to work on the in-line citations before doing a full re-review and deciding if the article still merits being considered a Good Article or would need to be de-listed. If you have any questions, please don't hesitate to contact us on the Good Article project talk page or you may contact me personally. On behalf of the Good Articles Project, I want to thank you for all the time and effort that you have put into working on this article and improving the overall quality of the Wikipedia project. LuciferMorgan 20:39, 13 December 2006 (UTC)
this person called Danimsturr is screwing up this website. i hate it when people do that. how about you? i do. —The preceding unsigned comment was added by Smouli (talk • contribs) 00:26, 11 April 2007 (UTC). you know your spamming right?
Maybe I didn't look hard enough but I don't see the answer I was looking for: does each cell contain the entire genetic code, or only part of it? E.g. would a single hair or skin flake contain all the information required to make a clone as seen in the movies? 142.59.172.187 20:19, 29 May 2007 (UTC)
There are a couple things that are unclear to a non-expet like me in the protein synthesis section:
It would be great if someone could clarify this. I'm not a protein synthesis expert. Atomota 08:00, 15 October 2007 (UTC)
What is a mesosome? This picture of the "typical" procaryotic cell with a mesosome is in this and other articles, none of which mention a mesosome. Let's get mesosome going in this article, since we're showing that it is part of the "typical" procaryotic cell! --69.226.108.255 (talk) 05:42, 10 March 2008 (UTC)
Change "Prokaryotes differ from eukaryotes since they lack of a nuclear membrane and a cell nucleus." to read "Prokaryotes differ from eukaryotes since they lack a nuclear membrane and a cell nucleus."(remove the word of)or to read "Prokaryotes differ from eukaryotes by the lack of a nuclear membrane and a cell nucleus." —Preceding unsigned comment added by 207.5.245.62 (talk) 05:17, 25 April 2008 (UTC)
It's a shame to have to revert good faith edits, but it looks like jotted down notes. And ribosomes don't pack proteins, chaperones do that, ribosomes just polymerise amino acids. And prokaryotes do have membranes. Narayanese (talk) 11:24, 4 June 2008 (UTC)
I'm assuming it goes through the endoplasmic reticulum, then gets stored in the vacuole, where it is sent through the ribosomes and becomes protein, and then gets stored in the Golgi Apparatus, eventually being released in vesciles brought through the mitochondria and becomes energy, the energy is brought to all the organelles. Is this correct? If so, shouldn't it be easier to find in the article to the average glancer? —Preceding unsigned comment added by Wikool (talk • contribs) 13:28, 23 October 2008 (UTC)
It needs Link FA|ca --Ssola (talk) 15:44, 28 October 2008 (UTC)
please draw simplified diagrams which are 2d and easy to understand. —Preceding unsigned comment added by 122.162.24.249 (talk) 15:29, 3 March 2010 (UTC)
please help help me find out what a nueclear pore. i need help for a project i am doing in class. —Preceding unsigned comment added by 97.118.226.38 (talk) 21:02, 2 November 2008 (UTC)
My edit summary wasn't that clear, but I gutted the section because I felt it only took a minority's view. The best article on the subject seems to be Evolutionary history of life#Origins of life on Earth.
Congratulations btw to the Catalan Wikipedia for getting Cèl·lula to featured article. Narayanese (talk) 09:50, 8 November 2008 (UTC)
Here is a bit I removed from the section beacuse I can't see what it has to do with the origin of cells:
Narayanese (talk) 07:47, 9 November 2008 (UTC)
Suddenly RNA came popping up.. but still cells had to apear ?? I find this not a good article what realy caused the creation of the cell shape are there no better theories then only DNA, (if i compare DNA or RNA to a memmorie chip, the chip alone will not be a computer, so how might cells have evolved on what pathways ?? 82.217.115.160 (talk) 01:41, 15 February 2010 (UTC)
In the "Cell Membrane" section there is a part that reads, "There is a wide range of compounds with different head and tail groups and usually the membrane is a mixture thereof. Hence, the layer is called a . It may also be called a fluid mosaic membrane." There's a word or words missing there, but I don't know what the layer is called. Smoggyrob 13:28, 20 November 2008 (UTC)
Under the heading : Origin of the first cell
"The eary cell membranes were probably more simple and permeable than modern ones"
It seems that "eary" should be replaced with "early"
Thank you.
What about the "Organelles" section? The table there seem to be misformatted; in the resulting HTML some parts are out of the generated <table>, for example "Mitochondria and Chloroplasts" and "Ribosomes". probably the fix is to add "|" to the beginning of each to-be-table-cell.
The current code is like this:
{| |- | ; Cell nucleus ... |[[Image:Diagram human cell nucleus no text.png|thumb|Diagram of a cell nucleus]] |- ; Mitochondria and Chloroplasts ....
Thank you, I fixed this. Tim Vickers (talk) 17:22, 5 May 2010 (UTC)
The largest single undivided cell ever observed was a slime mold, at approximately 30 square metres.
Radiohead40540057 (talk) 22:49, 21 April 2009 (UTC)
As part of the WikiProject Good Articles, we're doing sweeps to go over all of the current GAs and see if they still meet the GA criteria. I believe the article currently has several issues that need to be addressed, and as a result, I have delisted the article. Multiple sections in the article are lacking citations. Add additional citations from a variety of sources to provide a balanced representation of the information present. Perhaps sources can be pulled from the main articles linked to within the article. Look to books, magazines, newspaper articles, other websites, etc. It would be beneficial if the "History" section could be converted to prose as well (also aren't there other breakthroughs that can be mentioned past 1981?). Although the article has been delisted, the article can be returned to GA status by addressing the above points and giving the article a good copyedit. Once sources are added and cleanup is done, I recommend renominating the article at WP:GAN. If you disagree with this assessment, a community consensus can be reached at WP:GAR. If you need clarification or assistance with any of these issues, please contact me on my talk page and I'll do my best to help you out. --Happy editing! Nehrams2020 (talk • contrib) 17:43, 18 July 2009 (UTC)
This statement is false:
"[A]ll cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells." Unfree (talk) 18:25, 8 September 2009 (UTC)
Is there a listing of the relative numbers of different classes of cells in the human body? Neurons are higher class cells, like the ruling class, and I'm wondering how many of them there are (on average) compared to all the serf cells. --Neptunerover (talk) 23:54, 19 January 2010 (UTC)
Does anyone object to me setting up automatic archiving for this page using MiszaBot? Unless otherwise agreed, I would set it to archive threads that have been inactive for 30 days and keep ten threads.--Oneiros (talk) 13:59, 24 January 2010 (UTC)
I find the description of a cell's size quite lacking. Ten micrometers, what? Is that the areal? The length? Width? Volume? The unknown measurement tied to the fourth dimension? Or maybe, god forbid, the size of the writer's reproductional organ (this one is obviously a joke, but for the sake of my autistic brothers I thought I should explain)? Anyways, I am really confused.
I need to know the volume of the average human cell. This is because I want to know how much longer an identical twin egg will take in the womb than the non-twin egg. By getting said volume, and getting the average volume of an infant, I can calculate how much time there is between each time the cells divide. And, then I can add one time for the cells to divide, and adding that to the average of 9 months or rather 9*30 days = 270 days. So 270 days + the time it takes for the cells to divide.
What started this thing was me looking at the "identical twins" explanation, where one egg divides and you get twins. So, logically, twins are in the womb longer.
01-27-10
salut mon joko —Preceding unsigned comment added by Runematt51 (talk • contribs) 15:37, 12 March 2010 (UTC)
"..Robert Hooke in a book he published in 1665 when he compared the cork cells he saw through his microscope to the small rooms monks lived in.[5]"
According to the reference, and to what the article on Cell Theory says, he compared them to the compartments of a honeycomb. Please someone with the proper authority fix this. 82.130.50.95 (talk) 22:22, 16 April 2010 (UTC)
Jarkeld (talk) 22:03, 17 July 2010 (UTC) ((editsemiprotected)) In the Organelle section, second paragraph, first sentence please change:
There are several types of organelles a cell. to: There are several types of organelles in a cell.
75.156.153.212 (talk) 21:47, 17 July 2010 (UTC)
People, egge is not a cell. Egg consists of a small cell and large mass of proteins which is not cellular.--MathFacts (talk) 16:58, 4 November 2010 (UTC)
change the pounds to kilograms please!!! or put 1.5Kg next to it please!!! No like this please 1.5Kg(--- pounds) —Preceding unsigned comment added by Rohmann (talk • contribs) 00:23, 23 November 2010 (UTC)
Yeah the pounds thing is stupid. GET IT TOGETHER US AND UK!Yoshi39 (talk) 18:15, 14 December 2010 (UTC)
there are three domains of life & therefore three essential distinction in the variety of cells: eubacteria, archaebacteria & eukaryota. Traditionally, the three types present in the page are taught, however the definition has expanded, and there are many more cell types with distinct differences.
the intro, bad... scary bad... cells were first discovered? Cell was first coined as a term to discribe the cellular structure of cork, & further observed at a later date in collaboration, etc. Read up, use google.
Further Prokaryotic is an not only obsolete but its wrong. Prokaryotic suggests that the other two branches of life came BEFORE (PRO) Eukaryota & while this is a possibility, it isn't provable and remains philosophy and therefore you can't represent just one possibility but all known posibilities, etc. Thankfully, there are physical indicators used in the classification of cellular life today, DNA!!! we are decoding genetics & the continued use of old terminology is somewhat misleading and presents harm.
If you want to help correct this page, you can start here.
The Tree of Life: Tangled Roots and Sexy Shoots & here Scirus — Preceding unsigned comment added by Lawstubes (talk • contribs) 00:46, 23 July 2011 (UTC)
I like what you wrote about cells — Preceding unsigned comment added by Lwash (talk • contribs) 19:45, 13 September 2011 (UTC)
In the article it is stated that "The longest human cells are about 135 µm". I was under the impression that neurons held the title of the longest cell, given that a lower motor neurons extend from the spinal cord down to skeletal muscles in the lower limbs and ascending tracts enter the cord via the dorsal root and ascend to the medulla oblongata before synapsing with the second order sensory neuron. Can someone clarify this point, especially as the wiki page on the neuron states that some axons can be up to 1.5m long. — Preceding unsigned comment added by 194.176.105.132 (talk) 15:00, 15 September 2011 (UTC)
Says longest cell is 135 um and then says there's one that is body length. Actually says this in same sentence ATM 72.228.177.92 (talk) 22:04, 2 November 2011 (UTC)
I am fairly certain that this part of the lede is incorrect: "...longest - pseudounipolar cells which reach from extremities, including the toes to the lower brain stem...". I believe the author has confused "brain stem" with "spinal cord". The sensory neuron that innervates the big toe, a pseudounipolar neuron, has its cell body in the dorsal root ganglion, which is located just outside the spinal cord (see the Wiki page on Pseudounipolar Cell). The key point is that there is no cell that runs all the way from your brain in your head all the way to your big toe. There are sensory axons in your big toe that run ~3 feet up to the dorsal root ganglion, and there are neurons in the spinal cord that project 2-3 to the brain, but there are no cells that make the whole toe-to-brain trip alone. In general I really like this Cell page though. Thanks for all your hard work. Bourgeb (talk) 00:37, 11 November 2011 (UTC)
Bourgeb (talk) 05:35, 19 November 2011 (UTC)
Bourgeb (talk) 01:34, 29 November 2011 (UTC)
This page has sections on the life cycle of the cell including "Creation" and "Growth and Metabolism." The death section appears to be missing. It could contain a link to the page on apoptosis but also explain how poisons, viruses and anoxia actually cause the death of a cell, i.e., in the case of oxygen, what structures does affect, what happens to the physical parts of the cell during the dying process (and after death if it is part of a multicelluar organism). — Preceding unsigned comment added by 173.16.253.227 (talk) 03:21, 16 November 2011 (UTC)
The article says " Humans contain about 100 trillion cells"
It should be changed to "Humans Contain 10 trillion cells"
Reference: In other related articles in wiki , Human Microbiome, it is stated that the human body has 10 trillion cells and 100 trillion other micro-organisms
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Humans contain about 10 trillion cells
Kotappa (talk) 11:43, 29 December 2011 (UTC)
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(GWires)
I've been doing some research, and from what I've gathered, the human body has 50-75 trillion cells. Look it up, there are definitely sites that say 50-75 trillion cells! :0) (By the way, I'm Scottish, an American trillion might be different to the Scottish trillion.)
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The largest cell, which is often debated, is WITHIN an ostrich egg, not the egg itself. The cell itself does not weigh 3.3 pounds.
184.184.116.220 (talk) 16:02, 11 January 2012 (UTC)
I don't get it. I don't think a list of the largest, smallest, longest, shortest, etc. cells in humans (and then animals) is important enough to include in the lead, and maybe not even in the article.
Think about it: The purpose of this article is to give someone a better understanding of the cell. How does it help you understand the cell to know that the largest cell is (or isn't) the ostrich egg cell?
There area great teachers who know how to select the few important ideas out of a mass of details and explain them well. I'm not one of them.
But Neil Campbell was, and his textbook has an introductory chapter on the cell. Campbell simply says that most plant and animal cells are between 1 and 100 µm and therefore are visible only under the microscope. Notice that he doesn't just give puzzling-looking numbers, he explains their significance.
When I have trouble figuring out how to explain something, I turn to Campbell and see how he did it. It's usually better to follow Campbell than for me to figure out how to explain it myself. Sometimes I can find a Nobel laureate who explains it even better than Campbell.
Is there anybody here who thinks he can explain biology better than Campbell? --Nbauman (talk) 07:29, 13 January 2012 (UTC)
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Ribosomes are large globular proteins, and they are not true organelles. They have long been mistaken to be an organelle of a cell. An organelle is supposed to be enclosed within a vesicle (such as lysosomes, peroxisomes, vacoules) that is made up of a linear lipid structure or a bilayer (nucleus). Ribosomes, on the other hand, is not an enclosed structure like lysosomes or vacuoles. They are either cytoplasmic proteins or proteins embedded on the rough endoplasmic reticulum. Ribosomes are not true organelles.
Biologist88 (talk) 18:51, 22 January 2012 (UTC)
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Another structure found outside the cell wall or cell membrane is the cilia. Cilia are fine, hair-like projections that enable free-living organisms such as protists to move around their environment. Cilia are also found in multicellular animals. They are found in the lining of the respiratory tract to move foreign materials away from the lungs and out to the external environment, acting like a brush or an escalator. They are also found lining the Fallopian tube of higher mammals. With a sweeping-like action, they maneuver the ovum (egg cell) towards the uterus.
Biologist88 (talk) 06:38, 23 January 2012 (UTC)
There is not a single theory for the rise of the first cell- Not in the formal use of the word, at least. There are nmany ideas (in the form of hypothesis) that are considered, but is not aresolved issue (and the different groups of scientist studying them haven't reached a concensus yet. The use of the word "theories" is a non-trivial mistake that should be changed. — Preceding unsigned comment added by 74.213.86.132 (talk) 14:23, 3 February 2012 (UTC)
why cant they just have the ansers for this paper on a site o wait they do — Preceding unsigned comment added by 74.114.172.115 (talk) 19:09, 8 February 2012 (UTC)
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Hooke from [[Micrograph]], which is the origin of the word "'''cell'''" being used to describe the smallest unit of a living organism]]
at the beginning of the article should be changed back to
[[Image:Cork Micrograph Hooke.png|thumb|Drawing of the structure of [[Cork cambium|cork]] as it appeared under the microscope to Robert Hooke from [[Micrograph]], which is the origin of the word "'''cell'''" being used to describe the smallest unit of a living organism]]
It seems like the beginning of the tag was cut in a previous edit. 72.132.147.117 (talk) 02:40, 19 February 2012 (UTC)
I visited this article only to see what was considered cell components and found this:
"All cells, whether prokaryotic or eukaryotic, have a membrane that envelops the cell, separates its interior from its environment, regulates what moves in and out (selectively permeable), and maintains the electric potential of the cell. Inside the membrane, a salty cytoplasm takes up most of the cell volume. All cells possess DNA, the hereditary material of genes, and RNA, containing the information necessary to build various proteins such as enzymes, the cell's primary machinery. There are also other kinds of biomolecules in cells. This article lists these primary components of the cell, then briefly describe their function."
Sentence #3 is incorrect (All cells possess DNA). Not true. Red blood cells do not have DNA.
The last sentence has a grammar mistake: "This article lists these primary components of the cell, then briefly describeS their function. — Preceding unsigned comment added by 189.100.145.177 (talk) 00:15, 20 March 2012 (UTC)
The first definition is broken or it's moved but a found it again: http://www.ncbi.nlm.nih.gov/books/NBK26863/ Please fix it. --181.14.147.137 (talk) 09:25, 12 July 2012 (UTC)
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Humans contain about 100 trillion cells.(Reference: Text book of Medical Physiology, Eleventh Edition, Guyton & Hall, Elsevier Saunders SHANRUSHIA (talk) 11:40, 6 October 2012 (UTC)
This article definatly doesn't maintain an NPOV when it comes to the origin of life. It is based only on one of the atheistic theories, and those theories are highly controversial. Tagged. Randomizer3 (talk) 16:24, 8 November 2012 (UTC)
pokaryotes has a nucleas but lacs nuclear membrane — Preceding unsigned comment added by 49.249.134.36 (talk) 03:33, 21 November 2012 (UTC)
The item on the history of cell theory repeats a very common but outdated view. A better and more recent account is:
"The work of the Czech Jan Purkyně (1787–1869) and his student and collaborator Gabriel Valentin (1810–1883) was unjustly denigrated by the nationalistic Germans. They have a claim to some priority in the cell theory. Johannes Müller (1801–1858) also made great contributions. It was, however, his student Theodor Schwann (1810–1882) and Matthias Schleiden (1804–1881) who got the credit for the cell theory, despite the fact that some of their observations were not correct, and their credits to previous workers were 'a travesty'."
The underlining is mine, to draw attention to the extent of the problem. The source for these remarks are: Harris H. 1999. The birth of the cell. Yale University Press, New Haven, Chapter 9 and especially p97. Harris is a leading cell biologist, and fluent in German, so his conclusions are quite significant. Macdonald-ross (talk) 08:05, 20 October 2013 (UTC)
Not moved. bd2412 T 20:08, 28 January 2014 (UTC)
It was proposed in this section that Cell (biology)/Archive 1 be renamed and moved to Cell.
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The origin of the use of cell cites Micrographia, where the structure of cork is likened to the cells of a honeycomb, yet the text repeats the myth about cells in a monastery. There is no evidence that Hooke thought cells in cork looked like monastic cells, at the very least another source is required to justify the claim since the cited text contradicts it. Pete Kirkham (talk) 20:15, 9 July 2014 (UTC)
The above content I had removed, but since my removal has been reverted I will discuss here. The above lines are wrong, and can't be salvaged by simply changing some of the words:
Both prokaryotes and eukaryotes utilize many of the same metabolic pathways, including both utilizing glycolysis, the kreb's cycle, fermentation, aerobic and anaerobic respiration. If a discussion on their differing metabolisms is to be presented it should focus on the differing locations of where respiration occurs in prokaryotes vs. eukaryotes(in their mitochondria), as well as the greater diversity of metabolic pathways found in prokaryotes.TypingAway (talk) 06:08, 8 May 2015 (UTC)
"Different types of cell have cell walls made up of different materials; plant cell walls are primarily made up of pectin, fungi cell walls are made up of chitin and bacteria cell walls are made up of peptidoglycan"
Plant cell wall contains more cellulose than pectin. — Preceding unsigned comment added by Josemv (talk • contribs) 15:28, 25 April 2015 (UTC)
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I found the sentence, "The vacuoles of eukaryotic cells are usually larger in those of plants than animals," difficult to understand without reading it several times. I suggest a simpler re-wording:
In eukaryotic cells, the vacuoles of plants are usually larger than those in animals. 38.107.189.66 (talk) 18:21, 26 June 2015 (UTC)
Hello there! I'm AmericanLemming, and I'm a junior at the University of Oklahoma. This semester I am taking Cell Biology, which is one of my pre-med requisites. The textbook for the course is Molecular Biology of the Cell, 6th edition. This is the most recent version of the textbook, and has seven authors who have collaborated to condense the enormous amount of literature on the subject into some 1400 pages. Anyway, the point is that it is an authoritative, up-to-date, and comprehensive source on cellular biology; it's probably the most reliable source that we could use to write this article, only equaled by other up-to-date textbooks of its ilk.
What I'm getting at is that I would like to slowly improve this article throughout my fall semester (August 24th through December 18th). The article is decent but mediocre at present; it's a glorified outline with huge swaths of uncited text and overlinking. My proposed overhaul includes the following steps, not necessarily in this order (except for the first and last steps):
One other note: I plan on using footnotes to cite my textbook, seeing as I'll reference it hundreds of times in writing the article. (See the recently promoted FA Warren G. Harding for an example of what I plan to do.) Lastly, if you any recommendations, suggestions, concerns, or ideas, please let me know below. I don't own the article, so any active editor who watch-lists this page is free to improve upon my changes. Thank you. AmericanLemming (talk) 00:11, 22 August 2015 (UTC)
Additionally, just to make an already large task larger, it might be useful to simultaneously skim over the article about the discipline Cell biology and what info should go in which. T.Shafee(Evo﹠Evo)talk 23:29, 23 August 2015 (UTC)
Hello all. You may have been wondering why I haven't begun overhauling the article, or why I haven't edited the article in over a week. I'm finding that my class load is enough to keep me busy all the time; I barely have enough time to read Molecular Biology of the Cell, let alone use it to improve this article. And I hate it when editors say they're going to do something and then don't do it and don't even bother to explain why they're not doing it, so hence this post here. I bit off more than I could chew in saying I would improve this article, and I will try to keep that in mind before making any other outlandish, grandiose promises on Wikipedia in the future.
I may tweak the article some if I can find some time here and there, but I am 100% certain I will not be completely rewriting the article. I will continue making some improvements to Wikipedia over the course of the semester, but that will mainly take the form of fixing typos and working on my list of important Wikipedians by subject area, which you can find here: User:AmericanLemming/Noteworthy Wikipedians. Again, I apologize if I got any of your hopes up that somebody would finally fix up this article, and I will endeavor to "underpromise and overdeliver" in the future. AmericanLemming (talk) 06:29, 5 September 2015 (UTC)
@Iztwoz: explanations for my edits are in my edit summaries. I could also describe how we don't have nearly the strength of sources that would be necessary to support a new category of life... Sunrise (talk) 20:30, 22 November 2015 (UTC)
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What chemical elements of the periodic table are cells made of? This article does not mention this information. --Wyn.junior (talk) 20:58, 8 March 2018 (UTC)
User has already been asked not to use article talk pages for general discussion about the subject. Adrian J. Hunter(talk•contribs) 12:27, 8 January 2019 (UTC)
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In article; Some eukaryotic organelles such as mitochondria also contain some DNA. What organelles? I can’t see it under Organelles or with Wiki search. (And I couldn’t get Google to tell me either.) MBG02 (talk) 12:38, 7 January 2019 (UTC)
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Please translate from russian ru:Шаблон:Клетка Template:Eukaryotic cell. See also ru:Эритроцит--Axon-x (talk) 23:28, 25 January 2019 (UTC)
each cell has a history of differentiation --Axon-x (talk) 20:26, 31 January 2019 (UTC)
each cell type has a protein differentiation factors, protein on membrane, protein on nucleus membrane, interacting with other cells cytokines, protein proliferation factors--Axon-x (talk) 20:33, 31 January 2019 (UTC)
This article says "Every single cell in the human body is covered with a collection of glycans", and that they are a very important part of the cell, yet this wiki article doesn't mention glycans at all. Yurivict (talk) 04:02, 11 February 2019 (UTC)
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Please change "humans contain more than 10 trillion (1013) cells." to "humans contain more than 37.2 trillion (3.72 × 1013) cells."
According to this research 10 trillion is a common mistake that has no trusted reference and the new estimation is 3.72 trillion.
https://www.tandfonline.com/doi/full/10.3109/03014460.2013.807878 Sorryasshere154 (talk) 22:03, 24 March 2019 (UTC)
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So which people are not growing it is the problem of some cell of her or his he have not many cell 2405:204:3011:9E1B:0:0:AE2:50B1 (talk) 15:45, 27 August 2019 (UTC)
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Cell is a basic unit of life. There are two types of cells namely;
The complexity of a cell is amazing for its microscopic size. A water molecule is about 0.275 nm (Nanometers). Size up to the hemoglobin,(a protein) and you step up dramatically in size from 0.275 to 5 nm. Another size up and you get the HIV virus at 120 nm, another dramatic change in size. Another step in the stairs of the size of unimaginably small things, you get a T-cell, at roughly 5-8 mm (micrometers), again, much larger than the last. Then, finally, at the top of the stairs, a red blood cell, at 6-8 mm. The first not-so-dramatic change. — Preceding unsigned comment added by EmotionalBananaGirl (talk • contribs) 17:33, 18 November 2020 (UTC)
Hi! I wrote this article on the Zulu version of Wikipedia and I was trying to link it to this one as a new language but I can't because this one is locked. Can someone help me? SmangaMbongwa (talk) 00:14, 2 March 2021 (UTC)
Currently says: "The human brain accounts for around 80 billion of these cells" and cites Azevedo et al. That is a good reference source. But the reference says that there are on average 86 billion neuronal and 85 billion non-neuronal (glial) cells i.e. about 170 billion cells.
From what I had analyzed in a second update that attempted to redo the use of reFill2 to fix the article references, there were duplicated citations on that article that I fixed. However, a user named Mr Serjeant Buzfuz claims that the fix of the duplicated citations was incorrect on the first go at reFill2. I had made an effort to make the reference fixes correct again. I can't see a way that it isn't an issue about duplicated citations, though I can see a potential issue regarding reFill2 trying to rename the reference names. Refer to User talk:Mr Serjeant Buzfuz#Confusing refill2 for further context about the issue. Qwertyxp2000 (talk | contribs) 09:29, 30 August 2022 (UTC)
How did cell come into this world? Vivekpro (talk) 15:46, 18 May 2023 (UTC)
I'm just taking a gander through the to-do list that is on top of the talk page, listing notes on what I find.
Monk vs. Honeycomb - In Observation 18 of Micrographia, Hooke specifically notes "I could exceeding plainly perceive it to be all perforated and porous, much like a Honey-comb, but that the pores of it were not regular; yet it was not unlike a Honey-comb in these particular". There is no mention of any monastery or monks in this section, or the whole book for that matter
Cells in the human body - According to Sender 2016, there are 30 trillion human cells and 38 trillion bacterial cells in the human body. These numbers are radically different than the 100 and 50 trillion figures listed above.
This is my first time ever taking on something like this... let's see what happens Earth8845 (talk)