BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Except for glycine, all other naturally occurring − amino acids are optically active since the − carbon atom is asymmetric. These exist both in ′D′ and ′L′ forms. Most naturally occurring amino acids have a L− configuration. L− amino acids are represented by writing the −NH2 group on the left-hand side.

Detailed explanation-2: -All naturally occurring -amino acids except glycine are optically active. This is because glycine does not have all four different substituent which means that the carbon atom is achiral.

Detailed explanation-3: -Since there are two hydrogens present, glycine is optically inactive. All other amino acids contain four different groups. Hence all other amino acids are optically active. Therefore the correct statement is, all amino acids except glycine are optically active.

Detailed explanation-4: -All the standard amino acids except for glycine are chiral because they all have four different substituents attached to their carbon (C ) atom.

Detailed explanation-5: -Assertion: All naturally occurring -amino acids except glycine are optically active. Reason: Most naturally occurring amino acids have -configuration. Assertion and reason both are correct statements and reason explains the assertion.