Biology Acellular Life SZABMU 2024
PMDC Verified Question 9 of 70
Who purified the filterable agents for the first time?
A
Charles Chamberland
B
Ivanovsky
C
W. M. Stanley
D
Louis Pasteur
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: W. M. Stanley
Concept:

The timeline of virology involves sequential breakthroughs from filtration to biochemical isolation.

Solution:

  • While Chamberland and Ivanovsky discovered that infectious agents could pass through fine porcelain filters, it was Wendell M. Stanley in \( 1935 \) who achieved a massive breakthrough.
  • He was the first scientist to successfully purify and crystallize a virus (the Tobacco Mosaic Virus), proving it was a particulate, biochemical entity rather than a fluid.


Why other options are incorrect:

  • Chamberland: Invented the porcelain filter.
  • Ivanovsky: Proved the TMV pathogen was filterable.
  • Pasteur: Developed vaccines but did not purify a virus.

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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