A) All amino acids except lysine are optically active
B) All amino acids are optically active
C) All amino acids except glycine are optically active
D) All amino acids except glutamic acids are optically active
Correct Answer: C
Solution :
Only glycine: \[H-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{\underset{\begin{smallmatrix} | \\ N{{H}_{2}} \end{smallmatrix}}{\mathop{C}}\,}}\,-COOH\] is optically inactive amino acid.
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