Question:
What is the functional group present in serine, an amino acid, in addition to \(-NH_2\) and \(-COOH\) groups?
What is the functional group present in serine, an amino acid, in addition to \(-NH_2\) and \(-COOH\) groups?
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Serine contains a hydroxyl group in its side chain:
\[
-CH_2OH
\]
Hence, serine is classified as a hydroxy amino acid.
Updated On: Jun 24, 2026
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The Correct Option is A
Solution and Explanation
Step 1: Recall the structure of serine.
Serine is an amino acid whose structure is \[ HO-CH_2-CH(NH_2)-COOH \] It contains: \[ -NH_2 \] (amino group) and \[ -COOH \] (carboxylic acid group).
Step 2: Identify the additional functional group.
In the side chain of serine, \[ -CH_2OH \] is present.
This contains the hydroxyl functional group: \[ -OH \]
Step 3: Analyze the remaining options.
\[ -SH \] is present in cysteine, not serine.
\[ -NH- \] is not the side functional group in serine.
\[ -CONH_2 \] is an amide group and is not present in serine.
Step 4: Final conclusion.
Therefore, the additional functional group present in serine is \[ \boxed{-OH} \]
Serine is an amino acid whose structure is \[ HO-CH_2-CH(NH_2)-COOH \] It contains: \[ -NH_2 \] (amino group) and \[ -COOH \] (carboxylic acid group).
Step 2: Identify the additional functional group.
In the side chain of serine, \[ -CH_2OH \] is present.
This contains the hydroxyl functional group: \[ -OH \]
Step 3: Analyze the remaining options.
\[ -SH \] is present in cysteine, not serine.
\[ -NH- \] is not the side functional group in serine.
\[ -CONH_2 \] is an amide group and is not present in serine.
Step 4: Final conclusion.
Therefore, the additional functional group present in serine is \[ \boxed{-OH} \]
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