MDCAT Biology MCQ #748

In a PTB diagram showing the secondary structure of a protein, what specific interaction stabilizes the spiral alpha-helix configuration?

MDCAT Biology MCQ #748

  1. Question 1

    Q1. In a PTB diagram showing the secondary structure of a protein, what specific interaction stabilizes the spiral alpha-helix configuration?

    • A) Disulfide bridges
    • B) Hydrogen bonds
    • C) Ionic interactions
    • D) Hydrophobic forces

    Answer: Hydrogen bonds

    Explanation: Hydrogen bonds stabilize the alpha-helix at 3.6 amino acids per turn. Disulfide bridges are tempting but stabilize tertiary, not secondary, helical structures.