BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Amino acids, the building blocks of peptides and proteins, are found naturally in two forms (L and D enantiomers), except for glycine which does not have a chiral center.

Detailed explanation-2: -The amino acids are all chiral, with the exception of glycine, whose side chain is H.

Detailed explanation-3: -Glycine (Gly/G) is the amino acid with the shortest side chain, having an R-group consistent only of a single hydrogen. As a result, glycine is the only amino acid that is not chiral.

Detailed explanation-4: -Nineteen of the twenty amino acids are chiral (glycine is the only achiral amino acid) and can be described by using the D/L (R/S absolute configuration) convention. Eighteen of the nineteen chiral amino acids are in the L-form and only one exists in the D-isomer form in human biology.

Detailed explanation-5: -Except for glycine, the amino acids exist as chiral molecules in two forms, the l-and d-enantiomers. Although the two enantiomers exhibit identical physical and chemical properties, living organisms use only amino acids of l-chirality.