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On 16/06/2025 4:06 pm, LDagget wrote:On Sun, 15 Jun 2025 23:57:53 +0000, MarkE wrote:
I'm disinclined to answer your question as posed becomes it comes soThere is a problem if one insists on dubious ideas about how early>
prebiotic chemistry arose, especially if one clings to unworkable ideas
involving completely random synthesize from some prebiotic pool of
racemic
monomers. But that's a nonsensical model.
>
I'd be interested in your comments in the my logic and understanding of
the issue, as follows.
>
Life's molecules are now strictly homochiral (e.g. proteins composed of
only L-amino acids), therefore either they developed this way from the
beginning, or were purified by a later process.
>
If the former, this implies either an enantiomerically pure source of
monomers, or a prebiotic polymerisation process that selected only one
form. You suggest "specific catalysts [which] produce chirally specific
reactions", but what reactions exactly, in what prebiotically plausible
situation, and with what necessary amounts of material and time?
>
If the latter, this would involve the complete substitution of L for R
units and/or removal of R units. But this would change the structure of
say a protein and erase its evolved function. This alone rules out this
option.
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