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Last universal ancestor

63 点作者 shkesar大约 10 年前

5 条评论

sumitviii大约 10 年前
For anyone wondering if there were multiple LUAs: <a href="https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;askscience&#x2F;comments&#x2F;1bjvxs&#x2F;how_do_we_know_that_there_was_a_last_universal&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;askscience&#x2F;comments&#x2F;1bjvxs&#x2F;how_do_w...</a>
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arh68大约 10 年前
All I hear is <i>most stupendous badass of all time</i>: (forgive the long quote)<p><pre><code> ... self-replicating organisms came into existence on this planet and immediately began trying to get rid of each other, either by spamming their environments with rough copies of themselves, or by more direct means which hardly need to be belabored. Most of them failed,... Like every other creature on the face of the earth, [Godfrey Waterhouse IV] was, by birthright, a stupendous badass, albeit in the somewhat narrow technical sense that he could trace his ancestry back up a long line of slightly less highly evolved stupendous badasses to that first self-replicating gizmo — which, given the number and variety of its descendants, might justifiably be described as the most stupendous badass of all time. Everyone and everything that wasn&#x27;t a stupendous badass was dead. As nightmarishly lethal, memetically programmed death-machines went, [his parents] were the nicest you could ever hope to meet.... </code></pre> [1] <i>Cryptonomicon</i>, also found here <a href="http:&#x2F;&#x2F;tvtropes.org&#x2F;pmwiki&#x2F;pmwiki.php&#x2F;Main&#x2F;WorldOfBadass" rel="nofollow">http:&#x2F;&#x2F;tvtropes.org&#x2F;pmwiki&#x2F;pmwiki.php&#x2F;Main&#x2F;WorldOfBadass</a>
xpda大约 10 年前
Why is there only one &quot;beginning of life&quot; on earth? If life is likely to form in earth-like conditions after a few billion years, shouldn&#x27;t there be more than one &quot;last universal ancestor&quot;? Does this suggest that life on other earth-like planets may be very rare, or that ours is a unique life form for our environment?
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jostmey大约 10 年前
Quote from article &quot;Note, however, that some studies suggest that LUCA may have lacked DNA and been defined wholly through RNA&quot;.<p>How can anyone make this claim? Is there a single example of a living organisms that is not DNA based? If everyone organism alive today uses DNA then it is reasonable to assume that the LUCA was DNA based (which does NOT preclude the possibility that life started off as RNA based). I guess that&#x27;s wikipedia for you.
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PsykikTerrorist大约 10 年前
The Mew of real life.