Viruses Encode Their Own RNA Polymerases

Three strategies are used by different DNA viruses to accomplish transcription of viral DNA. The first type utilizes the host RNA polymerase, in some cases modifying it or 

A third type of virus, exemplified by bacteriophage N4, carries a virus specific RNA polymerase in its virion. This polymerase enters the cell together with the viral DNA and transcribes some early viral genes. Some of these genes code for specificity factors that direct the host RNA polymerase to transcribe late genes. Vaccinia virus is another example of a virus that contains a virion-encapsulated RNA polymerase. 

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Many Viruses Encode Their Own RNA Polymerases RNA-Dependent RNA Polymerases of RNA Viruses Other Types of RNA Synthesis Posttranscriptional Alterations of Transcripts... 

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