Where Does the Phage L Repressor Bind to Prevent Transcription

Question

Where does the phage l repressor bind to prevent transcription of the lytic genes?
A) CI
B) OL
C) OR
D) CIand OL
E) OLand OR

Accepted Answer

The phage l repressor binds to two sites in the operator region to prevent transcription of the lytic genes. These sites are O_L and O_R. Therefore, the best choice is E, which includes both of these sites.