Question
The amino acid having aromatic R group is :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Tyrosine
Identify Amino Acid with Aromatic R Group
Amino acids are classified based on their R (side) groups. Aromatic R groups contain a benzene ring or similar ring structure with delocalized electrons.
R Group Analysis
Let's examine the R groups of the given amino acids:
- Leucine: Has an aliphatic, branched R group ($-\text{CH}_2-\text{CH(CH}_3)_2$). Not aromatic.
- Arginine: Has a basic guanidinium group in its R group ($-\text{(CH}_2)_3-\text{NH}-\text{C(NH}_2)=\text{NH}_2^+$). Not aromatic.
- Tyrosine: Contains a phenyl group ($-\text{CH}_2-\text{C}_6\text{H}_4-\text{OH}$). The phenyl ring ($\text{C}_6\text{H}_4$) is aromatic.
- Threonine: Has a polar R group with a hydroxyl group ($-\text{CH(OH)-\text{CH}_3}$). Not aromatic.
Conclusion
Based on the R group structures, Tyrosine is the amino acid with an aromatic R group due to the presence of the phenyl ring.
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