Question:
Which from following amino acids has a unique structure so that the side chain connects to the back bone of amino acid at two points ?
Which from following amino acids has a unique structure so that the side chain connects to the back bone of amino acid at two points ?
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Proline is a cyclic amino acid with a pyrrolidine ring.
Updated On: Oct 1, 2026
- Histidine
- Proline
- Tryptophan
- Tyrosine
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The Correct Option is B
Solution and Explanation
Step 1: Understand the concept
In most amino acids the side chain is attached to the alpha carbon only. Proline is different because its side chain loops back to the nitrogen of the backbone.
Step 2: Structure of proline
Proline has a five membered pyrrolidine ring. The side chain is a three-carbon chain joined to the alpha carbon at one end and to the nitrogen at the other end, so it connects at two points.
Step 3: Check the others
Histidine has an imidazole side chain, tryptophan has an indole side chain and tyrosine has a phenol side chain. Each ring is attached only at one point, through a \(\text{CH}_2\) to the alpha carbon.
Step 4: Conclusion
Only proline fits.
Final Answer:
Proline has a cyclic structure with the side chain closing onto the nitrogen. This is option (B). \[ \boxed{\text{(B) }\text{Proline}} \]
In most amino acids the side chain is attached to the alpha carbon only. Proline is different because its side chain loops back to the nitrogen of the backbone.
Step 2: Structure of proline
Proline has a five membered pyrrolidine ring. The side chain is a three-carbon chain joined to the alpha carbon at one end and to the nitrogen at the other end, so it connects at two points.
Step 3: Check the others
Histidine has an imidazole side chain, tryptophan has an indole side chain and tyrosine has a phenol side chain. Each ring is attached only at one point, through a \(\text{CH}_2\) to the alpha carbon.
Step 4: Conclusion
Only proline fits.
Final Answer:
Proline has a cyclic structure with the side chain closing onto the nitrogen. This is option (B). \[ \boxed{\text{(B) }\text{Proline}} \]
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