MCQ Practice

Natural proteins are composed primarily of 20 α-amino acids. Which one of the following statements is true for any of these amino acids in a solution of pH 1.5?

A

Only the amino group is ionized

B

Only the carboxylic acid group is ionized

C

Both amino and carboxylic acid groups are ionized

D

Both amino and carboxylic add groups are neutral

Correct Answer: A