Which one of the following statements is correct?

Options

A. All amino acids except lysine are optically active
B. All amino acids are optically active
C. All amino acids except glycine are opitcally active
D. All amino acids except glutamic acid are optically active

Answer

C

Explanation

In amino acids if all the groups attached to a carbon are different then it is optically active. In glycine , there is no chiral carbon `underset("Glycine")(H_2N-CH_2 - COOH)`