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"Live a good life. If there are gods and they are just, they will not care how devout you have been, but will welcome you based on the values you have lived by. If there are gods, but unjust, then you should not want to worship them. If there are no gods, then you will be gone, but will have lived a noble life that will live on in the memory of your loved ones. I am not afraid."
- Unknown
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May 16 |
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What reasons allow for women to outlive men? @LanceLafontaine just been reading this article which is very interesting |
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May 13 |
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Does anyone know what marsupial this is? I think the OP could have included information like where the photo was taken? But still I am inclined to agree - I have seen many similar questions on here that were not closed. |
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May 11 |
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Exercise causes number of cell divisions to approach Hayflick limit faster? And hence shorten life expectancy? @shigeta the injured fibres (fused myogenic cells) are removed prior to "healing" (replacement with new fibres), or so I understand it. There may be degrees on damage that can be repaired without total removal, but generally I think the old is cleared to make room for new, stronger fibres (hence muscle being stronger after training (i.e. damage following exercise)) |
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May 10 |
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Is there any kind of immortality in plants? Just found this amazing example of a really old tree - >4000 years old! ncbi.nlm.nih.gov/pubmed/11295507 |
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Feb 27 |
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Is there any kind of immortality in plants? Hi there. There is a somewhat similar question here (biology.stackexchange.com/questions/2055/…) that I have posted an answer to. |
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Jan 26 |
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Why are 3 nucleotides used as codons for amino-acid mapping in DNA? @Kevin thanks, and you are absolutely right. I have given the answer a general re-work because I don't think it flowed properly having been adapted from a different question, and have taken your comment into account. Many thanks. |
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Jan 26 |
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Why are 3 nucleotides used as codons for amino-acid mapping in DNA? I have asked and answered this here because I had posted this answer to the linked question, but that was not truely answering it. There are now much better alternative answers, so I have asked the question I actually answered here! |
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Jan 5 |
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Why does human facial and head hair continue to grow? Another closely related question |
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Dec 12 |
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Athletes: nature vs. nurture? Hi @rg255 - thanks for the information and your opinions, but I was hoping for links to studies (like the one in your comment) where authors have tested for genetic contributions. I am of course expecting a large environmental contribution, but as you suggest the genetic contributions may be sport specific (e.g. height-increasing alleles for basketballers, bulk-increasing alleles for sumo-wrestling... etc). When I have some time later I will follow-up the paper you have sent, as this is quite an old study and have been cited almost 200 times! Clearly some other studies too. Many thanks. |
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Dec 5 |
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Is cell senescence in culture comparable to that in vivo? Many thanks indeed for your input, and the links. |
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Dec 5 |
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Is cell senescence in culture comparable to that in vivo? I wouldn't have said redundant, simply because that is what our in vivo experiment was designed to emulate - we have aged a culture of cells (human primary cell lines) by repeated passage until growth arrest (confirmed by β-galactosidase, morphological changes, and drastic slowing of doubling time). We are now using these as models of senescence in vitro. If I understand you correctly then this is a reasonable model because senescent cells tend to display quite a homogenous phenotype? So even though senescent cells in vitro may have arrived by a different route, this is still a good model? |
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Dec 4 |
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Is cell senescence in culture comparable to that in vivo? Hi - thanks for the info on senescent cells. So you are saying that cells senesced in culture are comparable to those in vivo? Or you are saying that they are not comparable, because senescent cells in vivo are not necessarily replicatively senesced cells? |
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Oct 8 |
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Do diurnal birds of prey recognize each other by their appearance? @Everyone that is true of course - but I imagine that a bird of prey would call to identify themselves to another bird, as you would have to be much closer to identify by sight. We use sound to identify people easily too - over the phone for example we can easily recognize a voice we know, without having any prior knowledge as to who it may be. I'm speculating of course, but it seems to me that sound would be much more useful to a bird in flight, or in a tree, because you may not be able to see one another! |
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Oct 7 |
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What type of biome is this? I'm not familiar with the definitions of a tropical savanna I'm afraid. Is this a homework question? |
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Oct 6 |
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Difference between Condensin and Cohesin proteins? You can edit your original question (by clicking 'edit', next to the vote buttons) to make it clearer, and tidy it up. I can do this if you would rather. Also my name is Luke, feel free to use it! :) |
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Oct 5 |
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Difference between Condensin and Cohesin proteins? Hi and welcome to bio.SE! When asking your questions, try to be as clear and provide as much information as is possible/relevant to help you get the best answer. Here, I think you need to separate your questions out a bit - you're asking about the difference in functions of the 2 proteins (cohesin and condesin), and you're also asking about cohesin's role in forming the kinetochore (related, but slightly separate). And what are you referring to when you ask 'how do they vary'? The 2 proteins? Don't be afraid to write a couple of paragraphs so that it is clear what you're asking. Thanks. |
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Oct 5 |
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Why does squinting allow you to see clearer objects? I can't think of any harmful effects, can you? Maybe constantly squinting would actually alter the shape of your eye/retina slightly, thus meaning you'd always need to squint (or get glasses)? |
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Oct 5 |
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Average number of gene products in (a) eukaryote(s) I thought it was much higher than this! More in the region of 100's of thousands, because the majority of genes have at least 2 alternative isoforms, usually more... I'll try to find some evidence. If this is the case then I am surprised (also I'm not getting at you - I realize you have cited UniProt, arguably the authority on this!) |
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Oct 4 |
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Can epigenetic changes affect reproductive success? Nice. Thanks Lance. |
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Oct 3 |
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Multi-nucleated cells: advantages and examples? @jello yes I realize that polymorphonuclear does not mean multiple nuclei, but 'mononuclear' does imply that 'ploynuclear' cells exist, and I am sure that muscle fibres do have multiple nuclei, because multiple cells fuse together. I'm interested to know the advantages of multiple nuclei, and what other cell types have it. Thanks |
