Question:
In which of the following amino acids, sulphur is NOT a constituent unit?
In which of the following amino acids, sulphur is NOT a constituent unit?
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Sulfur-containing amino acids: Cysteine, Cystine, Methionine. Proline is a cyclic secondary amino (imino) acid.
Updated On: Sep 4, 2026
- Cysteine
- Proline
- Methionine
- Cystine
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Amino acids are classified according to their chemical side-chain (R-group) functional groups, including aliphatic, aromatic, hydroxyl, and sulfur-containing groups.
Step 2: Detailed Explanation:
The sulfur-containing amino acids found in biological systems are:
1. Cysteine: Contains a thiol ($-SH$) sulfhydryl side group.
2. Methionine: Contains a non-polar methyl-thioether ($-S-CH_3$) group.
3. Cystine: A dimeric amino acid formed by a disulfide bridge ($-S-S-$) between two cysteine residues.
Proline is a non-polar cyclic imino acid containing a pyrrolidine ring, containing no sulfur atoms in its chemical structure.
Step 3: Final Answer:
Hence, sulfur is NOT a constituent of Proline, matching option (B).
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