Biology Biomolecules LUMHS 2014
PMDC Verified Question 141 of 142
Which level of protein structure maintains the helix shape of enzymes?
A
Secondary
B
Primary
C
Tertiary
D
Quaternary
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Secondary
Concept:

Protein architecture is divided into hierarchical levels based on folding patterns and bond interactions.

Solution:

  • The Secondary structure of a protein refers specifically to the localized, regular folding patterns of the polypeptide backbone.


  • These folded geometries strictly take the form of either the alpha-helix or the beta-pleated sheet, maintained rigidly by hydrogen bonds forming between the N-H and C=O groups along the backbone.


  • Note: While enzymes functionally rely on their overall 3D Tertiary shape, the specific 'helix shape' geometric component is entirely dictated and maintained by secondary structure.


Why other options are incorrect:

  • Primary: Defines the linear sequence of amino acids via peptide bonds.


  • Tertiary: Defines overall 3D globular folding via R-group interactions.


  • Quaternary: Defines multiple subunits binding together.

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.

Previous Question All Biomolecules MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App