Biology Acellular Life ETEA 2023
PMDC Verified Question 28 of 70
The head of some phages are icosahedral, which means that the head possess:
A
15 sides
B
6 sides
C
20 sides
D
10 sides
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 20 sides
Concept:

Geometric morphology allows viruses to maximize internal volume while minimizing protein subunit variety.

Solution:

  • The term "icosahedral" originates from Greek, where "eikosi" means twenty and "hedra" means seat or face.
  • Therefore, an icosahedral viral head structurally possesses exactly \( 20 \) triangular sides (faces).


Why other options are incorrect:

  • 6, 10, 15 sides: Do not correspond to the highly stable, geometric symmetry of an icosahedron.

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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