One protein-structure statement is incompatible with the other three. Identify it.
- ASecondary structure — includes α-helices and β-pleated sheets
- BTertiary structure — overall three-dimensional folding of a polypeptide
- CPrimary structure — amino-acid sequence of a polypeptide
- DTertiary structure — stabilised exclusively by peptide bonds with no side-chain interactions
✓ Correct answer: D
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