Which of the following statements correctly describes the tobacco mosaic virus (TMV)?
Correct answer: A. RNA virus
- A. RNA virus
- B. DNA virus
- C. Bacteriophage
- D. dsDNA virus
Explanation
Option (a) states that the tobacco mosaic virus (TMV) is an RNA virus. This statement is correct. TMV is a positive-sense, single-stranded RNA virus that infects plants. It belongs to the family Virgaviridae and the genus Tobamovirus. Its genome consists of a single-stranded RNA molecule, and it replicates using RNA-dependent RNA polymerase.
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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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