Question

Which region of the operon does the repressor bind to?

Answer 1

A repressor is going to stop something from happening.

In the case of an operon, you're looking at the process of transcription. In order for transcription to take place, RNA Polymerase has to be involved to create m-RNA. The RNA Polymerase would bind to the promoter region in order to begin transcribing.

Therefore, the repressor will stop transcription by binding to the promoter region of the operon and blocking RNA Polymerase from binding.

Answer 2

A. Operator B. Promoter C. Structural Genes