Question:
Identify a side chain (R) group present in serine, an amino acid.
Identify a side chain (R) group present in serine, an amino acid.
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Serine is a \textbf{hydroxyl-containing amino acid}. Always look for the \(-OH\) group in the side chain to identify it quickly in MCQs.
Updated On: Apr 26, 2026
- \(\text{CH}_3-\)
- \(\text{H}_3\text{C} - \text{CHOH}-\)
- \(\text{Me}_2\text{CH}-\)
- \(\text{HO} - \text{CH}_2-\)
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The Correct Option is D
Solution and Explanation
Concept:
Amino acids have a general structure: \[ \text{NH}_2 - \text{CH}(R) - \text{COOH} \] where \(R\) is the side chain that determines the identity and properties of the amino acid. Step 1: Recall the structure of serine. Serine is a polar amino acid with a hydroxyl (\(-OH\)) group in its side chain. Its structure is: \[ \text{NH}_2 - \text{CH}(\text{CH}_2\text{OH}) - \text{COOH} \]
Step 2: Identify the R group. From the structure: \[ R = \text{CH}_2\text{OH} = \text{HO} - \text{CH}_2- \]
Step 3: Match with the given options. Comparing with options:
Step 4: Conclusion. Hence, the side chain of serine is: \[ \text{HO} - \text{CH}_2- \]
Amino acids have a general structure: \[ \text{NH}_2 - \text{CH}(R) - \text{COOH} \] where \(R\) is the side chain that determines the identity and properties of the amino acid. Step 1: Recall the structure of serine. Serine is a polar amino acid with a hydroxyl (\(-OH\)) group in its side chain. Its structure is: \[ \text{NH}_2 - \text{CH}(\text{CH}_2\text{OH}) - \text{COOH} \]
Step 2: Identify the R group. From the structure: \[ R = \text{CH}_2\text{OH} = \text{HO} - \text{CH}_2- \]
Step 3: Match with the given options. Comparing with options:
- (A) \(\text{CH}_3-\) â present in alanine $\times$
- (B) \(\text{H}_3\text{C} - \text{CHOH}-\) â not serine $\times$
- (C) \(\text{Me}_2\text{CH}-\) â present in valine $\times$
- (D) \(\text{HO} - \text{CH}_2-\) â matches serine \checkmark
Step 4: Conclusion. Hence, the side chain of serine is: \[ \text{HO} - \text{CH}_2- \]
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