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Which type of chiral amino acids are found in nature?

a) L-amino acids
b) D-amino acids
c) DL-amino acids
d) Racemic amino acids

Answer :

Final answer:

L-amino acids are the type of chiral amino acids predominantly found in nature and used in proteins by living organisms, possessing the L-configuration and S stereochemistry, except for cysteine. The nomenclature for these amino acids is derived from L-glyceraldehyde, with naturally occurring L-amino acids often exhibiting dextrorotary properties when analyzed using a polarimeter.The correct option is A.

Explanation:

These enantiomers are designated as D- or L-forms. While both D- and L-forms are present in nature, the L-form is commonly incorporated into proteins by living systems.

The enzymes that synthesize these amino acids in living systems create a chiral environment that favors the formation of L-amino acids, leading to their preponderance in biological materials, as opposed to laboratory syntheses without a chiral environment, which typically yield racemic mixtures containing both L- and D-enantiomers in equal amounts.

According to the R/S naming system, most of the L-amino acids exhibit S stereochemistry, with the notable exception of cysteine. The absolute stereochemistry is based on their structural similarities to L-glyceraldehyde. In biochemical nomenclature, the L- and D-notations are used to distinguish these chiral molecules.

However, in terms of optical activity, L-amino acids, which are used by cells to build polypeptides and proteins, are dextrorotary and would be designated as d-amino acids in a polarimeter.The correct option is A

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