All of the Amino Acids That are Found in Proteins

Question

All of the amino acids that are found in proteins, except for proline, contain a(n) _____ group.
A) amino
B) carbonyl
C) carboxyl
D) ester
E) thiol

Accepted Answer

All amino acids, except proline, contain an amino group (-NH2) as part of their structure. Proline is unique because its amino group is part of a ring structure, making it a secondary amine.