Who purified filterable agents for the first time?
Correct answer: D. Stanley
- A. Charles Chamberland
- B. Ivanowski
- C. Louis Pasteur
- D. Stanley
Explanation
Wendell Meredith Stanley was the first to purify a virus, specifically the Tobacco Mosaic Virus (TMV) in 1935. He showed that TMV could be crystallized like a chemical and still remain infectious, which was a major breakthrough. This discovery helped prove that viruses were distinct from other microorganisms and opened the door to modern virology.
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About Biodiversity and Variety of Life
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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