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RNA polymerase is the enzyme that synthesizes DNA from the RNA strand. It mediates the critical process in gene expression, such as transcription.

Bacteria are single-celled prokaryotic organisms. The transcription process occurs more simply in bacteria compared to eukaryotes.

The RNA polymerase enzyme recognizes the promoter region directly and binds to it to begin the transcription process. There is no requirement for transcription factors in the prokaryotic cells.

Eukaryotic cells have complex organization compared to prokaryotic cells.The transcription factors are the assisting elements that facilitate the binding of the RNA polymerase with the promoter sequence. In this process, there is no direct binding involved.

The transcription factors have eligibility to control the rate of the transcription process.

Hence, the RNA polymerase itself searches for the promoters and binds to them in the case of the bacterial cell. In the eukaryotic cell, the transcription factors enable the binding of the promoter with the RNA polymerase.