The RNA polymerase holoenzyme transcribes

Options

A. the promoter, structural gene and the terminator region
B. the structural gene and the terminator regions
C. the structural gene and the terminator regions
D. the structural gene only

Answer

C

Explanation

In E. coli bacterium, the RNA polymerase has co-factors `beta`, `beta'`, `alpha`,`alpha'and `omega` along with `sigma`(sigma) factor , to catalyse the process. The transcription is completed in three steps.
Initiation `sigma`(sigma) factor recognises the start signal and promoter region on DNA which then along with RNA polymerase binds to the promoter to initiate transcription .

Elongation The RNA polymerase after initiation of RNA transcription loses the `sigma` factor but continues the polymerisation of ribonucleotides to from RNA
Termination Once The RNA polymerase reaches the termination region of DNA, the separates. This process is celled termination which is facilitated by termination factor `rho` (rho).
In prokaryotes, mRNA does not reqire any processing, so both transcription and translation occur in the cytosol. It can saic that transcription and translation are coupled together . ltbegt