Biology Biomolecules AJK 2019
PMDC Verified Question 119 of 142
Which type of bonds is required to maintain the alpha helix configuration of a protein?
A
Disulfide bonds
B
Ionic bonds
C
Hydrogen bonds
D
Hydrophobic interactions
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Hydrogen bonds
Concept:

The delicate, repeating architecture of secondary structures is maintained by repeating weak interactions.

Solution:

  • The α-helix coils the polypeptide chain into a rigid cylinder.


  • This specific spiral configuration is stabilized exclusively by repeating Hydrogen bonds forming vertically down the axis of the helix between the peptide backbone groups (C=O of one amino acid binding to the N-H of an amino acid four positions away).


Why other options are incorrect:

  • Disulfide, Ionic, and Hydrophobic bonds: These strictly mediate the large-scale folding of Tertiary and Quaternary structures by interacting between the distant R-groups, not the backbone.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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