Tobacco mosaic virus was discovered by:
Correct answer: C. Ivanowsky
- A. Stanley
- B. Pasteur
- C. Ivanowsky
- D. D' Herelle
Explanation
Stanley was the first scientist to crystallize the tobacco mosaic virus (TMV) in 1935. TMV spreads mainly through contact between infected and healthy plants or contaminated tools. Ivanowsky, a Russian scientist, discovered that TMV could pass through filters that trapped bacteria, proving it was caused by a virus. Félix D'Hérelle discovered bacteriophages, viruses that infect bacteria, in 1917. Louis Pasteur, the father of microbiology, developed the germ theory of disease and created vaccines for rabies and anthrax.
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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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