Question:
The amino acid containing mercaptan unit is
The amino acid containing mercaptan unit is
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Cysteine → contains –SH → forms disulfide bridges in proteins.
Updated On: May 2, 2026
- Leucine
- Glutamine
- Cysteine
- Lysine
- Isoleucine
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The Correct Option is C
Solution and Explanation
Concept: Functional groups in amino acids
---
Step 1: Mercaptan group
Mercaptan = thiol group: \[ -SH \] ---
Step 2: Identify amino acid with –SH group
Among amino acids:
• Cysteine contains –SH group
• Forms disulfide bonds (important in protein structure) ---
Step 3: Eliminate others
• Leucine → hydrocarbon side chain ❌
• Glutamine → amide group ❌
• Lysine → amine group ❌
• Isoleucine → hydrocarbon ❌ --- Final Answer: \[ \boxed{\text{Cysteine}} \]
---
Step 1: Mercaptan group
Mercaptan = thiol group: \[ -SH \] ---
Step 2: Identify amino acid with –SH group
Among amino acids:
• Cysteine contains –SH group
• Forms disulfide bonds (important in protein structure) ---
Step 3: Eliminate others
• Leucine → hydrocarbon side chain ❌
• Glutamine → amide group ❌
• Lysine → amine group ❌
• Isoleucine → hydrocarbon ❌ --- Final Answer: \[ \boxed{\text{Cysteine}} \]
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