Biology Support & Movement MDCAT 2017
PMDC Verified Question 70 of 75
Over lapping of thick filament occurs in:
A
A-Band
B
M-line
C
I-Band
D
Z-line
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: A-Band
Concept:

Banding patterns in the sliding filament model.

Formula:

N/A (Conceptual)

Solution:

  • The A-Band represents the entire length of the thick myosin filaments.


  • In the peripheral edges of the A-Band, these thick filaments physically overlap with the interdigitating thin actin filaments, creating a very dense, dark appearance under a microscope.


Why other options are incorrect:

The I-Band contains strictly thin filaments. The H-zone (center of A-band) contains only thick filaments (no overlap). The Z-line anchors thin filaments.

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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