Biology Support & Movement UHS 2024
PMDC Verified Question 12 of 75
Thick filaments in skeletal muscles are composed of:
A
Actin
B
Myosin
C
Tropomyosin
D
Troponin
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Myosin
Concept:

Protein composition of sarcomere filaments.

Formula:

N/A (Conceptual)

Solution:

  • The sarcomere relies on the interaction between two primary filament types to contract: thin and thick.


  • The thick filaments are extremely dense and are constructed entirely from hundreds of individual Myosin molecules, bound together with their globular heads protruding outward to grab the thin filaments.


Why other options are incorrect:

Actin is the primary structural protein of the thin filaments. Tropomyosin and Troponin are regulatory proteins intimately wrapped around the thin actin filaments, not the thick ones.

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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