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The current thinking amongst biophysicists is that if we all woke up tomorrow to find that someone had edited the book of life so as to exchange all of the L-'s and D-'s (and made similar mirroring changes to all of the molecules that any protein interacts with), everything would be exactly the same. Milton, et al. (Science, 1992) lent supporting empirical ...


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As you say yourself, biological molecules are usually available in both chiralic possibilities, yet nature uses only one of the two possibilities. At some point in our molecular evolution (and at a very early one) L-amino acids were stochastically "chosen" over their D-equivalents (I think that the choices would have been equiprobable). There is no reason ...


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Amine, alkyl, and carboxylate. I'd guess the part that you're having trouble on is that the alpha carbon in the center of the generic AA structure is part of an alkyl functional group Edit The original answer that I gave might have been too clever for its own good. Depending on how one looks at the question, the third functional group could instead be ...



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