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The structures of the genomes of cellular organisms are generally one or more chromosomes composed of double-stranded DNA. This is true of many viruses as well, but some viruses have genomes of either double-stranded RNA, single-stranded DNA, or single-stranded RNA.

Consider a virus with a genome of single-stranded RNA. When this virus replicates in its host cell, it will need to synthesize many copies of that genome.

Which of the following enzymes, or sets of enzymes, would be sufficient to make copies of single-stranded RNA?

Select ALL that apply.


DNA-dependent RNA polymerase.


RNA-dependent DNA polymerase.


RNA-dependent RNA polymerase.


RNA-dependent DNA polymerase and DNA-dependent RNA polymerase.

Select an assignment template