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RNA polymeraseplugin-autotooltip__default plugin-autotooltip_bigRNA polymerase: the enzyme that carries out RNA transcription. There are many different types of RNA polymerase, but in this book we collectively refer to them as just “RNA polymerase” for simplicity.: the enzymeplugin-autotooltip__default plugin-autotooltip_bigEnzyme: a macromolecule, usually a protein (but sometimes an RNA), that functions as a catalyst of some kind of biochemical reaction. that carries out RNA transcriptionplugin-autotooltip__default plugin-autotooltip_bigRNA transcription: the process of RNA polymerase using the DNA sequence of a gene as a template to form an mRNA (in prokaryotes) or pre-mRNA (in eukaryotes). In most cases, “transcription” implies RNA transcription..