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. For example transfer RNA molecules, messenger RNA molecules and ribosomal RNA molecules. Now, the last thing I'd like to mention is in E. Coli cells so in prokaryotic cells, for example, bacterial cells a single RNA polymerase forms all the different types of RNA molecules the mRNA tRNA and RNA. But in our own cells, in the human cells we have three different we have three different RNA polymerases as we'll discuss in a future lecture.