zo RNA polymerases come in s different forms, but share many features RNA polymerases performs essentially the same reaction in all cells a Bacteria have only a single 9 RNA polymerases while in 6 eukaryotic cells there are three: RNA Pol I, II and III 1111 RNA polymerases come in different forms, but share many features ◼ RNA polymerases performs essentially the same reaction in all cells ◼ Bacteria have only a single RNA polymerases while in eukaryotic cells there are three: RNA Pol I, II and III RNA polymerase and the transcription cycle