So in DNA polymerase we said that DNA polymerase requires that primer sequence but RNA polymerase does not. Now, unlike DNA polymerase which has the endonuclease activity has the ability to essentially correct the mistakes it makes. RNA polymerase cannot correct the mistakes it makes. So if it incorrectly pairs up two bases it will not be able to correct that mistake. And that means RNA polymerase makes many more mistakes as compared to DNA polymerase which makes less mistakes. So this is the RNA polymerase molecule that essentially is involved in forming that RNA molecule during the process of transcription when we essentially copied the code found in the DNA and form these RNA molecules.