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Author Topic:   Abiogenesis - Or Better Living Through Chemistry
MarkAustin
Member (Idle past 2007 days)
Posts: 122
From: London., UK
Joined: 05-23-2003


Message 69 of 85 (66458)
11-14-2003 8:28 AM
Reply to: Message 61 by DNAunion
11-04-2003 12:57 AM


Re: sadistics
quote:
quote:
Rrhain: The point is that there are ways to achieve homochirality.

/*DNAunion*/ So show us the experiment that started with racemic mixtures of ribonucleotides and produced homochirality in polynucleotides under prebiotically plausible conditions. “In principle” is one thing, experimental support is another.


As with any debate with creationists, the air is filled with the creaking sounds of goal posts being moved. Look at the original question:

quote:
The calculation implicitly relies upon homochirality. If both enantiomeric forms of the bases (actually, the sugar moieties of the bases) were present, enantiomeric cross inhibition would hinder the formation of long polymers needed for replication or other complex function.

Chirality was the question. Nothing else. None of these other objections. Rrhain answered it. It has been demonstrated that it is possible for molecules to selectively extract the correct handed molecules, indeed correct errors of chirality.

While all the points raised are valid, they are in this context irrelevant. As I read the article, the intent was to prove that molecules of the correct chirality could be selected. They did so. They have demonstrated that chiralirty need not be a problem.


This message is a reply to:
 Message 61 by DNAunion, posted 11-04-2003 12:57 AM DNAunion has responded

Replies to this message:
 Message 74 by DNAunion, posted 11-16-2003 12:35 AM MarkAustin has responded

    
MarkAustin
Member (Idle past 2007 days)
Posts: 122
From: London., UK
Joined: 05-23-2003


Message 75 of 85 (67312)
11-18-2003 9:29 AM
Reply to: Message 74 by DNAunion
11-16-2003 12:35 AM


Chirality
DNAunion

No, Your original reply said:

quote:
The calculation implicitly relies upon homochirality. If both enantiomeric forms of the bases (actually, the sugar moieties of the bases) were present, enantiomeric cross inhibition would hinder the formation of long polymers needed for replication or other complex function.

This clearly states that if both bases were present, the formation of self-replicators would be hindered. Rrhain's post clearly demonstrated that relatively simply molecules can selectively extract compounds of the correct chirality. Thus chirality is not a problem in the gross sense.


This message is a reply to:
 Message 74 by DNAunion, posted 11-16-2003 12:35 AM DNAunion has responded

Replies to this message:
 Message 76 by DNAunion, posted 11-19-2003 10:33 PM MarkAustin has not yet responded

    
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