Question

What is the function of the promoter (P) in the lac operon?

Options

• The region where the repressor protein binds

• The molecule that inactivates the repressor

• The site where RNA polymerase binds to begin transcription

• The gene that codes for permease

Answer 1

The promoter is the DNA segment where RNA polymerase binds to initiate transcription of the structural genes. It is a critical component for transcription to begin, regardless of whether the operon is on or off.