Synthesizing Polymerase	Type of RNA Produced	Function
RNA polymerase I	18S, 5.8S & 28S ribosomal RNA	Forms essential ribosomal components
RNA polymerase II	mRNA	Translated by ribosomes to form specific proteins
	Small nuclear RNA	Involved in mRNA splicing & transcription regulation
	MicroRNA	Causes gene silencing via translation arrest or mRNA degradation
RNA polymerase III	Transfer RNA	Adaptor molecule linking codons with specific amino acids
	5S ribosomal RNA	Essential component of 60S ribosomal subunit

Mnemonic

I, II, and III are numbered in the same order that their products are used in protein synthesis: rRNA, mRNA, then tRNA.