Final answer:
RNA polymerases in Prokaryotes and Eukaryotes have a low similarity due to several differences in their structure and function.
Step-by-step explanation:
RNA polymerases in Prokaryotes and Eukaryotes have a low similarity due to several differences in their structure and function.
In prokaryotes, a single RNA polymerase transcribes all genes, while in eukaryotes, there are three different RNA polymerases: RNA polymerase I, II, and III, each transcribing a different subset of genes.
Additionally, the subunit composition of the RNA polymerases is different between prokaryotes and eukaryotes, leading to variations in their transcription mechanisms. For example, eukaryotic RNA polymerase II relies on multi-subunit transcription factors, while prokaryotic RNA polymerase does not.