Forces that stabilize protein secondary structure
Which interaction primarily stabilizes protein secondary structures such as α-helices and β-sheets?
Answer B: explanation for every choice
A
Peptide bonds link residues in sequence and define primary structure.
B
Correct. Backbone C=O and N–H groups hydrogen-bond within a helix or between strands of a sheet.
C
Disulfide bonds are covalent cross-links that stabilize tertiary and quaternary structure.
D
Hydrophobic interactions among side chains are the main driving force for tertiary folding.
TakeawayPrimary: peptide bonds. Secondary: backbone hydrogen bonds. Tertiary: side-chain interactions.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb9.