Final answer:
Viral DNA is made into mRNA through the process of (Option 5)transcription, where DNA serves as a template to produce RNA. In reverse-transcribing viruses, like HIV, reverse transcriptase converts RNA to DNA, which is then transcribed to mRNA.
Step-by-step explanation:
Viral DNA makes mRNA by the process of transcription. In this process, the DNA serves as a template to produce an RNA molecule. For reverse-transcribing viruses, such as HIV, reverse transcriptase is used to make DNA from the RNA genome. This DNA is then incorporated into the host's genome, and from there, mRNA is transcribed, which is eventually used for protein synthesis.
DNA viruses typically utilize host cell proteins and enzymes to replicate viral DNA and transcribe viral mRNA, directing the synthesis of viral proteins. RNA viruses use the RNA core as a template for synthesis of viral genomic RNA and mRNA, which subsequently instructs the host cell to produce viral components.