Biology Cell NUMS 2023
PMDC Verified Question 65 of 143
Each centriole is composed of ____ microtubules.
A
Seven triplets
B
Nine triplets
C
Eleven triplets
D
Five triplets
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Nine triplets
Concept: Centrioles have a highly conserved, rigid geometric structure across all animal cells.

Solution: A single centriole is a short cylinder composed of exactly nine triplets of microtubules arranged in a ring (a $9+0$ arrangement).

Distractor Autopsy: Any other number (seven, five, eleven) violates the conserved $9+0$ microtubule organizing structure found in nature.

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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