Biology Biomolecules UHS 2022
PMDC Verified Question 88 of 142
Unique three-dimensional shape of the fully folded polypeptide constitutes:
A
Primary structure of protein
B
Quaternary structure of protein
C
Secondary structure of protein
D
Tertiary structure of protein
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Tertiary structure of protein
Concept:

Protein folding reaches functional maturity at specific structural hierarchies.

Solution:

  • The Tertiary structure is defined exactly as the ultimate, overall three-dimensional shape of a single, fully folded polypeptide chain.


  • It is uniquely determined by complex interactions (disulfide bridges, hydrophobic exclusions, ionic bonds, hydrogen bonds) strictly between the varying R-groups of the constituent amino acids.


Why other options are incorrect:

  • Primary/Secondary: Refer only to linear sequence and localized coils/sheets, lacking full 3D completion.


  • Quaternary: Refers to the arrangement of multiple distinct polypeptide subunits together (e.g., Hemoglobin), rather than a single folded chain.

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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