Multiple choice

Disulfide special group is present in which of the following amino acids?

  1. Arginine

  2. Threonine

  3. Cystine

  4. Asparagine
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cystine contains a disulfide (-S-S-) bond formed by the oxidation of two cysteine thiol groups. This covalent linkage between two cysteine residues is crucial for protein structure stabilization. Arginine contains guanidino group, threonine has hydroxyl group, and asparagine contains amide group - none have disulfide bonds.

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