Each amino acid has two functional groups in common and one of 20 other groups attached to the α-carbon. The two functional groups are
A)carboxyl and amine.
B)ester and amine.
C)carboxyl and amide.
D)alcohol and amine.
E)carboxyl and peptide.

Question

Quizplus · Accepted Answer

All amino acids have a carboxyl group (-COOH) and an amine group (-NH2) attached to the α-carbon. This is what makes them amino acids. The third group attached to the α-carbon is the variable side chain, which can be one of 20 different groups.

Each Amino Acid Has Two Functional Groups in Common and One