question_answer

Which of the following statements is not correct?

A) Proteins are polyamides formed from amino acids.

B) Except glycine, all other amino acids show optical activity.

C) Natural proteins are commonly made up of L-isomer of amino acids.

D) In a-amino acids, \[-N{{H}_{2}}\] and \[-COOH\] groups are attached to different carbon atoms.

Correct Answer: D

Solution :

In \[\alpha \]-amino acids, \[-\,N{{H}_{2}}\] and —COOH groups are attached to the same carbon atom,