Which of the following amino acids is a secondary amine?

Name: Which of the following amino acids is a secondary amine?
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Question

Quizplus · Accepted Answer

Proline is unique among the standard amino acids because it is the only one that contains a secondary amine group. This is due to its side chain forming a cyclic structure with the nitrogen atom of the amino group, making the nitrogen a part of the ring structure and thus a secondary amine.

Which of the Following Amino Acids Is a Secondary Amine