Question:
Which from following amino acids contains 'S' in its side chain (R)?
Which from following amino acids contains 'S' in its side chain (R)?
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Methionine is the only amino acid that contains sulfur in its side chain.
Updated On: Jun 30, 2026
- Methionine
- Lysine
- Glutamic acid
- Glycine
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understand the side chains of amino acids.
Amino acids have side chains that may contain sulfur. Methionine is an amino acid that has a sulfur-containing side chain, specifically a thioether group \((-CH_2-S-CH_3)\).
Step 2: Analyze other options.
- Lysine contains an amine group \((-NH_2)\) in its side chain, with no sulfur.
- Glutamic acid contains a carboxyl group in its side chain, with no sulfur.
- Glycine has a hydrogen atom as its side chain, with no sulfur.
Step 3: Identify the correct amino acid.
The only amino acid from the options with sulfur in its side chain is Methionine.
Step 4: Final answer.
\[ \boxed{\text{Methionine}} \] which matches option \((1)\).
Amino acids have side chains that may contain sulfur. Methionine is an amino acid that has a sulfur-containing side chain, specifically a thioether group \((-CH_2-S-CH_3)\).
Step 2: Analyze other options.
- Lysine contains an amine group \((-NH_2)\) in its side chain, with no sulfur.
- Glutamic acid contains a carboxyl group in its side chain, with no sulfur.
- Glycine has a hydrogen atom as its side chain, with no sulfur.
Step 3: Identify the correct amino acid.
The only amino acid from the options with sulfur in its side chain is Methionine.
Step 4: Final answer.
\[ \boxed{\text{Methionine}} \] which matches option \((1)\).
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