Which of the following types of protein structure is stabilized by disulfide bonds?

A Primary structure
B Secondary structure
C Tertiary structure ✓
D Quaternary structure

Explanation

Disulfide bonds are covalent bonds between cysteine residues that stabilize the tertiary structure of a protein, which is the native, three-dimensional shape of a single protein molecule.

Mnemonic

Disulfide = 'di' = two sulfur atoms holding tertiary structure

Source

Nelson et al., Lehninger Principles of Biochemistry
Protein Metabolism Biochemistry Protein Structure Easy MEDICAL Confidence: high