Final answer:
During transcription, there are multiple RNA polymerases at work in a cell. Eukaryotes have three types of RNA polymerases - RNA polymerase I, II, and III. Each polymerase synthesizes different types of RNA.
Step-by-step explanation:
During transcription, there are multiple RNA polymerases at work in a cell. In eukaryotes, there are three types of RNA polymerases - RNA polymerase I, II, and III. Each polymerase is responsible for synthesizing different types of RNA. RNA polymerase I synthesizes 18S, 5.8S, and 28S rRNAs, RNA polymerase II synthesizes mRNAs, and RNA polymerase III synthesizes tRNAs and 5S rRNAs.