Biology Biomolecules MDCAT 2019
PMDC Verified Question 117 of 142
The structure of a fibrous protein comprises of polypeptide chains in the form of:
A
Flat uncoiled chains
B
Cluster
C
Long strands or fibrils
D
Spherical or curled up ball
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Long strands or fibrils
Concept:

A protein's macroscopic structure perfectly dictates its physiological function (structure-function relationship).

Solution:

  • Fibrous proteins (like collagen, keratin, silk) function to provide immense tensile strength and structural support.


  • To achieve this, their polypeptide chains do not fold into complex 3D shapes. Instead, they align closely in parallel, forming tough, extended long strands or fibrils.


Why other options are incorrect:

  • Spherical / curled up ball / cluster: These describe the highly folded nature of Globular proteins (enzymes, antibodies, hormones).

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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