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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The three standard aromatic amino acids (Phenylalanine, Tyrosine, and Tryptophan) absorb ultraviolet light near $280\text{ nm}$, which is used in laboratories to quantify protein concentrations.
Updated On: Jul 10, 2026
- Histidine
- Proline
- Tyrosine
- Lysine
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Amino acids are classified based on the chemical properties of their side chains (R-groups). Aromatic amino acids contain a cyclic, resonance-stabilized aromatic ring.
Step 2: Detailed Explanation:
- Tyrosine: Contains a phenol ring linked to its $\beta$-carbon, making it an aromatic amino acid.
- Histidine: Contains a basic imidazole ring. While the ring has aromatic properties, it is typically classified as a basic or heterocyclic amino acid in introductory biology.
- Proline: Contains a cyclic pyrrolidine ring, classifying it as an imino acid.
- Lysine: Has a straight-chain aliphatic side chain with a basic amino group.
The primary, universally recognized aromatic amino acids are Phenylalanine, Tyrosine, and Tryptophan.
Step 3: Final Answer:
The aromatic amino acid is Tyrosine.
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