Eukaryotic cells contain multiple RNA polymerases, which makes it difficult to block all RNA synthesis with one drug targeted to a specific polymerase. Which one of the following best describes properties of eukaryotic RNA polymerases? A. Polymerase I produces most of the rRNA. B. Polymerase II produces most of the tRNA. C. Polymerase III produces most of the mRNA. D. All three RNA polymerases have the same mechanism of action and bind to the same promotor sequences on DNA. E. Enhancers identify the start point for transcription for all three polymerases.