Which intermolecular bond type stabilizes the secondary structures (alpha-helix and beta-pleated sheets) of globular proteins?
Answer and explanation
Correct answer: D. Hydrogen bonds between carbonyl oxygens and amide hydrogens of the peptide backbone
- Step 1: Secondary protein structure refers to local folding patterns of the polypeptide chain. Step 2. The alpha-helix and beta-pleated sheet are stabilized by regular hydrogen bonds between the C=O of one peptide bond and the N-H of another. Answer: Hydrogen bonds between carbonyl oxygens and amide hydrogens of the peptide backbone. Why not the others: Disulfide bridges, hydrophobic forces, and salt bridges stabilize tertiary and quaternary structures.
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