All of the following descriptions concerning viral multiplication and nucleic acids are true EXCEPT that:
Correct answer: D. Viral mRNA,viral tRNA, and viral ribsomes are used in viral replication
- A. Viruses contain DNA or RNA, not both
- B. Viruses replicate only in living cells
- C. Viruses use the cell's biosynthetic machinery to synthesize copies of themselves
- D. Viral mRNA,viral tRNA, and viral ribsomes are used in viral replication
Explanation
Option A: Viruses contain either DNA or RNA, but not both, due to their small genome size. The type of genome determines how the virus replicates and infects host cells.Option B: Viruses are obligate intracellular parasites and rely on host cells for energy, enzymes, and machinery to replicate their genome and produce new viral particles.Option C: After entering a host cell, viruses hijack the cell's machinery to synthesize viral proteins and replicate their genome, assembling new virus particles until the host cell is destroyed.Option D: Viral replication depends on polymerases suited to their genome type, such as RNA-dependent RNA polymerase for RNA viruses. Poliovirus uses RdRp to replicate its positive-sense ssRNA genome, making this the correct option.
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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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