5'-3' RNA polymerase activity RNA polymerase activity ribonucleic acid nucleotidyltransferase Catalysis of the reaction: nucleoside triphosphate + RNA(n) = diphosphate + RNA(n+1); the synthesis of RNA from ribonucleotide triphosphates in the presence of a nucleic acid template, via extension of the 3'-end. [database_cross_reference: EC:2.7.7.6][database_cross_reference: GOC:pf][database_cross_reference: GOC:mah] ribonucleic transcriptase activity RNA transcriptase activity RNA nucleotidyltransferase activity ribonucleic acid polymerase activity ribonucleate polymerase activity C RNA formation factors C ribonucleic acid formation factors ribonucleic polymerase activity Reactome:R-HSA-5696807 Reactome:R-HSA-6786881 ribonucleic acid transcriptase activity ribonucleate nucleotidyltransferase activity transcriptase http://purl.obolibrary.org/obo/go.owl RNA polymerase activity