Enzymes are contained in the virion of retroviruses because the genome is not used directly as mRNA.

Name: Enzymes are contained in the virion of retroviruses because the genome is not used directly as mRNA.
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Retroviruses contain enzymes, such as reverse transcriptase, within their virion to convert their RNA genome into DNA before integration into the host cell's genome. The converted DNA is then used as a template for transcription and protein synthesis.

Enzymes Are Contained in the Virion of Retroviruses Because the Genome