Question:
The following are aromatic amino acids:
The following are aromatic amino acids:
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The three important aromatic amino acids are phenylalanine, tyrosine and tryptophan. They contain aromatic rings in their side chains.
Updated On: Jun 19, 2026
- Threonine
- Tyrosine
- Proline
- Lysine
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The Correct Option is B
Solution and Explanation
Step 1: Understand aromatic amino acids.
Aromatic amino acids are those amino acids that contain an aromatic ring in their side chain.
The aromatic ring gives special chemical properties to these amino acids.
Common aromatic amino acids are phenylalanine, tyrosine and tryptophan.
Step 2: Check tyrosine.
Tyrosine contains a benzene ring with a hydroxyl group attached to it.
Because of the presence of this aromatic ring, tyrosine is classified as an aromatic amino acid.
Thus, \[ \text{Tyrosine is aromatic.} \]
Step 3: Analyze other options.
Threonine is a hydroxyl-containing amino acid but it does not have an aromatic ring.
Proline is an imino acid with a cyclic structure, but it is not aromatic.
Lysine is a basic amino acid and contains an amino group in its side chain, but no aromatic ring.
Step 4: Final conclusion.
Therefore, among the given options, the aromatic amino acid is \[ \boxed{\text{Tyrosine}} \]
Aromatic amino acids are those amino acids that contain an aromatic ring in their side chain.
The aromatic ring gives special chemical properties to these amino acids.
Common aromatic amino acids are phenylalanine, tyrosine and tryptophan.
Step 2: Check tyrosine.
Tyrosine contains a benzene ring with a hydroxyl group attached to it.
Because of the presence of this aromatic ring, tyrosine is classified as an aromatic amino acid.
Thus, \[ \text{Tyrosine is aromatic.} \]
Step 3: Analyze other options.
Threonine is a hydroxyl-containing amino acid but it does not have an aromatic ring.
Proline is an imino acid with a cyclic structure, but it is not aromatic.
Lysine is a basic amino acid and contains an amino group in its side chain, but no aromatic ring.
Step 4: Final conclusion.
Therefore, among the given options, the aromatic amino acid is \[ \boxed{\text{Tyrosine}} \]
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