Question

part d
the secondary structure of a protein results from
ionic bonds
bonds between sulfur atoms
hydrophobic interactions
hydrogen bonds
peptide bonds

Explanation:

To determine the correct answer, we analyze each option:

• Ionic bonds: Involved in protein tertiary/quaternary structure, not secondary.
• Bonds between sulfur atoms (disulfide bonds): Form in tertiary structure for stabilization.
• Hydrophobic interactions: Drive tertiary structure folding (core formation).
• Hydrogen bonds: Form between the backbone atoms of the polypeptide chain, creating secondary structures like α - helices and β - sheets.
• Peptide bonds: Link amino acids in the primary structure.

So, the secondary structure of a protein results from hydrogen bonds.

Answer:

D. hydrogen bonds