Biology Biomolecules SZABMU 2024 Reconduct
PMDC Verified Question 25 of 142
The protein present in blood plasma and involved in blood clotting is:
A
Hormones
B
Fibrinogen
C
Antibodies
D
Enzymes
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Fibrinogen
Concept:

The body must maintain the ability to rapidly seal circulatory leaks using a highly specialized, soluble protein precursor.

Solution:

  • Fibrinogen is a massive, soluble protein continuously synthesized by the liver and floated passively in the blood plasma.


  • When a blood vessel is ruptured, an enzymatic cascade is triggered. The enzyme thrombin chops a piece off the soluble Fibrinogen, converting it instantly into insoluble Fibrin.


  • These fibrin threads violently polymerize, forming a sticky, fibrous net that traps platelets and red blood cells, effectively creating the solid blood clot.


Why other options are incorrect:

  • Antibodies: Proteins used to hunt and destroy foreign pathogens (immunity), not for structural clotting.


  • Hormones: Chemical messengers.


  • Enzymes: Biological catalysts. While enzymes (like thrombin) trigger the process, Fibrinogen is the actual structural protein that forms the clot itself.

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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