Which structural change occurs in a protein when a disulfide bridge forms between two cysteine residues?

💡 Explanation

When a disulfide bridge forms, covalent bonding occurs between the sulfur atoms of two cysteine residues, pulling distant parts of the polypeptide chain closer, stabilizing the overall 3D structure and reducing the protein's conformational entropy. Therefore tertiary structure stabilization results, rather than affecting only primary structure stability, bond cleavage, or hydrogen bond disruption which have negligible effect on conformation.

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