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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