MDCAT Biology MCQ #734

In the formation of an alpha-helix within a globular protein, what specific interaction stabilizes the spiral shape of the polypeptide backbone?

MDCAT Biology MCQ #734

  1. Question 1

    Q1. In the formation of an alpha-helix within a globular protein, what specific interaction stabilizes the spiral shape of the polypeptide backbone?

    • A) Hydrogen bonding between C=O and N-H
    • B) Disulfide bridges between cysteine residues
    • C) Hydrophobic interactions of R-groups
    • D) Ionic attractions between acidic and basic groups

    Answer: Hydrogen bonding between C=O and N-H

    Explanation: Secondary structure is stabilized by hydrogen bonds between C=O and N-H groups. Disulfide bridges are characteristic of tertiary and quaternary structures.