Biology Biomolecules NUMS 2023
PMDC Verified Question 53 of 142
Which of the following protein establishes the matrix of bone & cartilage?
A
Elastin
B
Collagen
C
Keratin
D
Histone
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Collagen
Concept:

The structural integrity of skeletal connective tissue relies on a highly specialized extracellular fibrous protein network.

Solution:

  • Collagen is the primary structural protein of the extracellular matrix in all connective tissues.


  • It forms tough, inextensible fibers that act as the physical scaffold (matrix) into which calcium phosphate is deposited to form rigid bone, or proteoglycans are deposited to form flexible cartilage.


Why other options are incorrect:

  • Keratin: Structural protein, but strictly for external appendages like hair, nails, and epidermis, not internal skeletal matrices.


  • Elastin: Provides elasticity to lungs and arteries, not rigid skeletal structure.


  • Histone: A nuclear globular protein used to spool DNA.

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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