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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.
Initiation: a promoter nucleotide sequence signals the start of transcription. RNA polymerase enzyme attaches to the promoter to start mRNA synthesis. 2. Elongation: Individual complementary mRNA nucleotides bond together to form a single mRNA strand. 3. Termination: RNA polymerase reaches a base called a terminator. mRNA is released from the DNA template.