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 optically active
D. All amino acids except glutamic acids are optically active

Answer

C

Explanation

With the exception of glycine all the 19 other common amino acids have a uniquely different functional group on the central tetrahedral alpha carbon.