Question:
Which of the following is a thiol-containing amino acid?
Which of the following is a thiol-containing amino acid?
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Cysteine forms disulfide bonds, which are strong covalent bonds that can stabilize the tertiary and quaternary structure of proteins by linking two cysteine residues together.
Updated On: Jan 17, 2026
- Cysteine
- Glycine
- Serine
- Tryptophan
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The Correct Option is A
Solution and Explanation
Cysteine is a sulfur-containing amino acid featuring a thiol (-SH) group in its side chain. This group plays critical roles in protein chemistry:
• Forms disulfide bonds (-S-S-) during oxidation, stabilizing protein structures.
• Participates in catalytic activity in enzyme active sites.
Cysteine’s unique properties make it indispensable in maintaining protein structure and function.
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