MDCAT Biology MCQ #849

In the stabilization of tertiary protein structure, two cysteine residues undergo an oxidation reaction. Which specific functional groups interact to form this bridge?

MDCAT Biology MCQ #849

  1. Question 1

    Q1. In the stabilization of tertiary protein structure, two cysteine residues undergo an oxidation reaction. Which specific functional groups interact to form this bridge?

    • A) Amine groups
    • B) Carboxyl groups
    • C) Sulfhydryl groups
    • D) Hydroxyl groups

    Answer: Sulfhydryl groups

    Explanation: Disulfide bridges form specifically between the sulfhydryl (-SH) groups of cysteine. Hydroxyl groups form hydrogen bonds, not covalent disulfide bridges.