Question:
Which amino acid from following contains —CH$_3$ as side chain?
Which amino acid from following contains —CH$_3$ as side chain?
Show Hint
Alanine is the simplest chiral amino acid with a methyl side chain.
Updated On: Apr 26, 2026
- Leucine
- Alanine
- Serine
- Valine
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Amino acids have the general formula $R-\text{CH}(\text{NH}_2)\text{COOH}$. The $R$ group is the side chain.
Step 2: Identification
- Glycine: $R = \text{H}$ - Alanine: $R = \text{CH}_3$ - Valine: $R = \text{CH}(\text{CH}_3)_2$ - Serine: $R = \text{CH}_2\text{OH}$
Step 3: Conclusion
Alanine has a methyl group ($-\text{CH}_3$) as its side chain.
Final Answer: (B)
Amino acids have the general formula $R-\text{CH}(\text{NH}_2)\text{COOH}$. The $R$ group is the side chain.
Step 2: Identification
- Glycine: $R = \text{H}$ - Alanine: $R = \text{CH}_3$ - Valine: $R = \text{CH}(\text{CH}_3)_2$ - Serine: $R = \text{CH}_2\text{OH}$
Step 3: Conclusion
Alanine has a methyl group ($-\text{CH}_3$) as its side chain.
Final Answer: (B)
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