Biology Support & Movement MDCAT 2014
PMDC Verified Question 75 of 75
The repeated protein pattern of myofibrils is called:
A
Sarcomere
B
Sarcolemma
C
Zyomere
D
Cross bridges
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Sarcomere
Concept:

Ultrastructure of striated muscle fibers.

Formula:

N/A (Conceptual)

Solution:

  • A myofibril is composed of highly organized repeating units of actin and myosin filaments.


  • This repeating functional pattern, stretching from one Z-line to the next, is strictly defined as a sarcomere. It is the fundamental contractile unit of striated muscle.


Why other options are incorrect:

The sarcolemma is the cell membrane. Cross bridges are the physical attachments between myosin heads and actin. 'Zyomere' is an incorrect/typographical distractor for Z-line.

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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