Rna polymerases

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RNA polymerase

(Science: enzyme molecular biology) An enzyme that polymerise ribonucleotides in accordance with the information present in dNA.

prokaryotes have a single enzyme for the three rNA types that is subject to stringent regulatory mechanisms. Eukaryotes have type I that synthesises all rRNA except the 5S component, type II that synthesises mRNA and hnRNA and type III that synthesises tRNA and the 5S component of rRNA.