Which of the following statements is not correct ?

Options

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 `alpha`-amino acids, `-NH_(2)` and `-COOH` groups are attached to different carbon atoms.

Answer

D

Explanation

In `alpha`-amino acids, `-NH_(2)` and `-COOH` groups are attached to the same carbon atom,