Biology Acellular Life SZABMU 2024 Reconduct
PMDC Verified Question 10 of 70
A virus recognizes its specific host organism by which characteristics?
A
Viral genome
B
Viral envelope
C
Host cytoplasm
D
Host genome
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Viral envelope
Concept:

Viral tropism (host specificity) relies entirely on a "lock and key" mechanism occurring at the cellular surface.

Solution:

  • A virus recognizes its susceptible host via specific glycoprotein spikes or surface proteins embedded in the viral envelope (or the capsid in naked viruses).
  • These surface structures act as the "key" that chemically binds to specific, matching receptor proteins on the host cell membrane.


Why other options are incorrect:

  • Viral/Host genome & Host cytoplasm: These are internal components. A virus must first recognize and attach to the exterior of a host cell before it can interact with the cytoplasm or genome.

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