Question:
Which one of the following is an aromatic amino acid?
Which one of the following is an aromatic amino acid?
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Aromatic amino acids = Tyrosine, Phenylalanine, Tryptophan.
Updated On: Jul 2, 2026
- Histidine
- Proline
- Tyrosine
- Lysine
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The Correct Option is C
Approach Solution - 1
Tyrosine contains a benzene ring and is classified as an aromatic amino acid along with phenylalanine and tryptophan.
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Approach Solution -2
Alternate approach — Side-chain classification and elimination:
Amino acids are grouped by their R-group chemistry. Histidine has an imidazole ring and is classified functionally as a basic amino acid, not the standard aromatic group. Proline is unique in having its side chain cyclised back onto the backbone nitrogen, making it an imino acid, not an aromatic one. Lysine has a simple aliphatic chain ending in an amino group and is classified as basic/aliphatic. Tyrosine, however, carries a phenol group, a benzene ring with an attached -OH, directly on its side chain, and is grouped with phenylalanine and tryptophan as one of the three standard aromatic amino acids.
Eliminating Histidine, Proline, and Lysine on structural grounds leaves Tyrosine as the correct aromatic amino acid.
Amino acids are grouped by their R-group chemistry. Histidine has an imidazole ring and is classified functionally as a basic amino acid, not the standard aromatic group. Proline is unique in having its side chain cyclised back onto the backbone nitrogen, making it an imino acid, not an aromatic one. Lysine has a simple aliphatic chain ending in an amino group and is classified as basic/aliphatic. Tyrosine, however, carries a phenol group, a benzene ring with an attached -OH, directly on its side chain, and is grouped with phenylalanine and tryptophan as one of the three standard aromatic amino acids.
Eliminating Histidine, Proline, and Lysine on structural grounds leaves Tyrosine as the correct aromatic amino acid.
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