Polymerase

RNA polymerase is an enzyme that synthesizes RNA molecules. In a narrow sense, RNA polymerase is usually called DNA-dependent RNA polymerases that synthesize RNA molecules on the DNA matrix, that is, transcription. Enzymes of the RNA polymerase class are very important for the functioning of the cell, so they are present in all organisms and in many viruses. Chemically, RNA polymerases are nucleotidyl transferases polymerizing ribonucleotides at the 3' end of the RNA chain.