Question
Which amino acid contain Sulfur atom in its side chain?
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Methionine
Amino Acid Sulfur Side Chains Explained
Amino acids are the fundamental units of proteins. Some amino acids possess unique side chains that include a sulfur atom. Identifying these amino acids is important for understanding protein structure and function.
Analyzing Amino Acid Side Chains for Sulfur
- Methionine: This amino acid's side chain contains a thioether functional group. The structure is represented as `-CH2-CH2-S-CH3`, clearly showing a sulfur atom linked to two carbon atoms.
- Tyrosine: The side chain of Tyrosine includes a phenol group, which is a benzene ring attached to a hydroxyl group (-OH). It does not contain any sulfur atoms.
- Alanine: Alanine is the simplest amino acid with an aliphatic side chain consisting of just a methyl group (`-CH3`). It lacks a sulfur atom.
- Serine: Serine has a hydroxymethyl group (`-CH2-OH`) as its side chain. This group contains oxygen but no sulfur.
Conclusion on Sulfur Amino Acids
Based on the structural analysis of their side chains, Methionine is the amino acid that uniquely contains a sulfur atom.
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