Question:
Which one contains a methyl group ?
Which one contains a methyl group ?
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This amino acid has the smallest, simplest hydrocarbon side chain of the four.
Updated On: Jul 4, 2026
- Glutamine
- Tryptophan
- Tyrosine
- Alanine
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The Correct Option is D
Solution and Explanation
Step 1: Amino acid side chains vary widely in structure. Glutamine carries an amide side chain, tryptophan carries a bulky indole ring, and tyrosine carries a phenolic ring with a hydroxyl group.
Step 2: Alanine has the simplest hydrocarbon side chain among common options here, a single methyl group (-CH3) attached to the alpha carbon.
Step 3: Since none of glutamine, tryptophan or tyrosine's side chains is a plain methyl group, the amino acid that actually contains a methyl group as its side chain is alanine.
Step 4: So the correct answer is Alanine.
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