Question:
Which one among the following is aromatic amino acid?
Which one among the following is aromatic amino acid?
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Aromatic amino acids absorb light strongly in the ultraviolet spectrum, with a absorption maximum near \(280\text{ nm}\).
This physical property is extensively used in biochemistry laboratories to quickly quantify protein concentration in solutions.
This physical property is extensively used in biochemistry laboratories to quickly quantify protein concentration in solutions.
Updated On: Aug 20, 2026
- Arginine
- Lysine
- Tyrosine
- Cystine
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Amino acids are classified structurally based on the chemical properties of their side chains (R-groups).
Step 2: Detailed Explanation:
- Aromatic Amino Acids: These contain a closed, planar carbon ring structure (benzene ring or indole ring) in their side chain that exhibits aromaticity.
The three standard proteinogenic aromatic amino acids are Phenylalanine, Tyrosine, and Tryptophan.
Tyrosine has a phenolic hydroxyl group attached to its benzene ring.
- Arginine and Lysine are basic, positively-charged amino acids.
- Cystine is a sulfur-containing dimer of two cysteine residues.
Step 3: Final Answer:
The aromatic amino acid is Tyrosine, which corresponds to option (C).
Amino acids are classified structurally based on the chemical properties of their side chains (R-groups).
Step 2: Detailed Explanation:
- Aromatic Amino Acids: These contain a closed, planar carbon ring structure (benzene ring or indole ring) in their side chain that exhibits aromaticity.
The three standard proteinogenic aromatic amino acids are Phenylalanine, Tyrosine, and Tryptophan.
Tyrosine has a phenolic hydroxyl group attached to its benzene ring.
- Arginine and Lysine are basic, positively-charged amino acids.
- Cystine is a sulfur-containing dimer of two cysteine residues.
Step 3: Final Answer:
The aromatic amino acid is Tyrosine, which corresponds to option (C).
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