Question:
In addition to \(-NH_2\) and \(-COOH\) groups, the functional group present in the amino acid serine is X and the functional group present in the amino acid cysteine is Y. X and Y are respectively
In addition to \(-NH_2\) and \(-COOH\) groups, the functional group present in the amino acid serine is X and the functional group present in the amino acid cysteine is Y. X and Y are respectively
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Serine contains hydroxyl (-OH) group, while cysteine contains thiol (-SH) group.
Updated On: Jul 29, 2026
- \(-CONH_2\), \(-SH\)
- \(-OH\), \(-SH\)
- \(-SH\), \(-OH\)
- \(-OH\), \(-CONH_2\)
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The Correct Option is B
Solution and Explanation
Step 1: Identify the structure of serine
Serine has the structure:
\[
NH_2-CH(CH_2OH)-COOH
\]
Along with amino and carboxyl groups, it contains:
\[
-OH
\]
group.
So,
\[
X = -OH
\]
Step 2: Identify the structure of cysteine Cysteine has the structure: \[ NH_2-CH(CH_2SH)-COOH \] Along with amino and carboxyl groups, it contains: \[ -SH \] group. So, \[ Y = -SH \] Thus, \[ X = -OH,\qquad Y = -SH \] \[ \boxed{(-OH),(-SH)} \] Therefore, the correct answer is: \[ \boxed{(B)} \]
Step 2: Identify the structure of cysteine Cysteine has the structure: \[ NH_2-CH(CH_2SH)-COOH \] Along with amino and carboxyl groups, it contains: \[ -SH \] group. So, \[ Y = -SH \] Thus, \[ X = -OH,\qquad Y = -SH \] \[ \boxed{(-OH),(-SH)} \] Therefore, the correct answer is: \[ \boxed{(B)} \]
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