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Question:

Which one of the following statements is correct?

All amino acids except lysine are optically active.

All amino acids are optically active.

All amino acids except glycine are optically active.

All amino acids except glutamic acids are optically active.

Solution:

Only 'glycine' is optically inactive (contains two hydrogen atoms at the α-carbon) whereas all other amino acids are optically active. Option C is correct.