Question:
Which from following amino acids contains heterocyclic ring at a side chain (R) group?
Which from following amino acids contains heterocyclic ring at a side chain (R) group?
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Histidine is the amino acid with an imidazole heterocyclic ring in its side chain.
Updated On: May 14, 2026
- Threonine
- Histidine
- Cysteine
- Valine
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The Correct Option is B
Solution and Explanation
Concept:
A heterocyclic ring is a ring structure that contains at least one atom other than carbon, such as nitrogen, oxygen, or sulfur. Among amino acids, some side chains are simple alkyl groups, while some contain aromatic or heterocyclic rings.
Step 1: Check threonine, cysteine and valine.
• Threonine has a hydroxyl-containing side chain.
• Cysteine has a sulfur-containing side chain.
• Valine has a branched alkyl side chain. None of these contain a heterocyclic ring.
Step 2: Check histidine.
Histidine contains an imidazole ring in its side chain. This imidazole ring is a heterocyclic ring because it contains nitrogen atoms in the ring. Hence, the correct answer is:
\[ \boxed{(B)\ \text{Histidine}} \]
A heterocyclic ring is a ring structure that contains at least one atom other than carbon, such as nitrogen, oxygen, or sulfur. Among amino acids, some side chains are simple alkyl groups, while some contain aromatic or heterocyclic rings.
Step 1: Check threonine, cysteine and valine.
• Threonine has a hydroxyl-containing side chain.
• Cysteine has a sulfur-containing side chain.
• Valine has a branched alkyl side chain. None of these contain a heterocyclic ring.
Step 2: Check histidine.
Histidine contains an imidazole ring in its side chain. This imidazole ring is a heterocyclic ring because it contains nitrogen atoms in the ring. Hence, the correct answer is:
\[ \boxed{(B)\ \text{Histidine}} \]
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