Biology Acellular Life NUMS 2024
PMDC Verified Question 17 of 70
Corona virus is enveloped virus. Hand sanitizers and hand cleaners were recommended to avoid COVID epidemic. Which property of corona virus made these products effective?
A
ss-RNA genome
B
pH sensitivity
C
Hypo-tonicity
D
Heat sensitivity
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: pH sensitivity
Concept:

The chemical stability of a viral envelope dictates its susceptibility to external disinfectants.

Solution:

  • Coronaviruses rely on an outer lipid bilayer (envelope) to protect themselves and to fuse with host cells.
  • According to the provided clinical notes, this delicate lipid envelope is highly sensitive to changes in pH and alcohol concentrations. Hand sanitizers physically disrupt and dissolve this envelope, instantly neutralizing the virus.


Why other options are incorrect:

  • ss-RNA genome: The sanitizers destroy the outer envelope before they interact with the internal genome.
  • Heat sensitivity: Sanitizers work chemically at room temperature, not via heat.
  • Hypo-tonicity: Osmotic pressure does not play a primary role in alcohol-based viral inactivation.

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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