Question:
Which from following aminoacids contains heterocyclic ring at a side chain (R) group?
Which from following aminoacids contains heterocyclic ring at a side chain (R) group?
Show Hint
Look for the amino acid whose R group contains an indole ring.
Updated On: Nov 13, 2026
- Arginine
- Phenylalanine
- Leucine
- Tryptophan
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
The R group (side chain) can be aliphatic, aromatic or heterocyclic.
Step 2: Check each option
Arginine has a guanidinium group (open chain). Leucine has an isobutyl group. Phenylalanine has a benzyl group (benzene, carbocyclic).
Tryptophan has an indole side chain, which contains a nitrogen atom in the ring, so it is heterocyclic.
Step 3: Match
The answer is Tryptophan, option (D).
Final Answer:
Tryptophan has a heterocyclic indole ring in its side chain. \[ \boxed{\text{(D) }\text{Tryptophan}} \]
The R group (side chain) can be aliphatic, aromatic or heterocyclic.
Step 2: Check each option
Arginine has a guanidinium group (open chain). Leucine has an isobutyl group. Phenylalanine has a benzyl group (benzene, carbocyclic).
Tryptophan has an indole side chain, which contains a nitrogen atom in the ring, so it is heterocyclic.
Step 3: Match
The answer is Tryptophan, option (D).
Final Answer:
Tryptophan has a heterocyclic indole ring in its side chain. \[ \boxed{\text{(D) }\text{Tryptophan}} \]
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