What structural feature distinguishes glycine from other natural $α$ -aminoacids?

It is optically inactive.

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It contains aromatic group.

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It is a dicarboxylic acid.

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It has a secondary amine.

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Solution

The correct option is A It is optically inactive.
Glycine is optically inactive whereas other amino acids are optically active.

Glycine is $N H_{2} - C H_{2} - C O O H$ . It lacks chiral $C$ atom.

Other amino acids have general formula $N H_{2} - C^{*} H R - C O O H$ and have chiral $C$ (marked with asterisk).

Hence, they are optically active.

Option A is correct.

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(A) Proline is a secondary amine

(B) Most of natural α-aminoacids have L-configuration

(D) A trinucleotide has phosphodiester linkage.

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