question_answer

Which of the following is not an amino-acid?

A)  Glycine                               

B)  Alanine

C)  Histidine                            

D)  Benzidine

Correct Answer: D

Solution :

                Amino acid contains both amino group and carboxylic group. Benzidine is not a amino acid while glycine, alanine and histidine are amino acid.