Because their host cells have dsDNA genomes,viruses with RNA genomes cannot rely on host cell enzymes for genome replication or mRNA synthesis.

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Viruses with RNA genomes require their own enzymes (e.g. RNA polymerase) to replicate their genome and produce mRNA. They cannot rely on host cell enzymes because these enzymes are specific to DNA-based processes.

Because Their Host Cells Have DsDNA Genomes,viruses with RNA Genomes