Answer:
The correct answer is "transcription".
Explanation:
RNA polymerase is an enzyme that synthesize RNA from DNA. The main function of RNA polymerase in bacteria is to perform transcription: the synthesis of messenger RNA from a DNA template (gene) that is later used to translate proteins. A bacterial cell that has a mutation in its gene for RNA polymerase will be directly affected on the way it performs transcription. The mutation could have a lethal effect on the bacteria, because transcription is a essential process for life.
