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Compare RNA-dependent RNA polymerase. RNA polymerase (RNAP or RNApol), also known as DNA-dependent RNA polymerase, is an enzyme that produces primary transcript RNA. In cells, RNAP is necessary for constructing RNA chains using DNA genes as templates, a process called transcription.
During transcription, a strand of mRNA is formed that is complementary to the sequence within the DNA. Transcription begins when RNA polymerase binds to the DNA promoter for a gene. The DNA helix is unwound and the primary mRNA strand is made by RNA polymerase.