Amino acids contain an amino group along with a/an:
Acarboxyl (acidic) group
Bhydroxyl group only
Caldehyde group
Dphosphate group
Answer & Solution
Correct answer: A. carboxyl (acidic) group
An amino acid has an amino (–NH₂) group and a carboxyl (–COOH) acidic group on the α-carbon.
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