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RNA polymerase

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Template:STRUCTURE 3m3y

RNA polymerase (RNAP, DNA primase, dnaG) catalyzes the addition of nucleotides to RNA during transcription.
DNA-dependent RNA polymerase catalyzes the transcription of RNA from a DNA template. The DNA-dependent eukaryote RNAP are divided to
RNAP I (or Pol I) which transcribes ribosomal RNA;
RNAP II (or Pol II) transcribes DNA and most snRNA and microRNA;
RNAP III (or Pol III) transcribes tRNA and 5S ribosomal RNA.
DNA primase (DNAP) is RNAP which catalyzes the synthesis of the RNA primer which complements an ssDNA template and initiates DNA synthesis.
dnaG is a bacterial primase.
For DNA-dependent RNA polymerase see

RNA-dependent RNA polymerase catalyzes the replication of RNA from a RNA template. An example is the Influenza virus RNA polymerase which is composed of 3 subunits. Subunit PA is involved in cap-snatching. Subunit PB1 is involved in RNA synthesis. Subunit PB2 is involved in RNA replication and transcription. It is implicated in endonuclease cleavage of RNA primers. (1qln; blue: nontemplate strand; cyan: template strand; red:RNA). See also Transcription and RNA Processing.
For RNA-dependent RNA polymerase from Hepatitis C virus - NS5B - see