Which diagram shows a system in which the lac operon genes are about to be transcribed?
I cannot see the pictures because the link is not working, but C is the correct answer based on the evaluation of the other three. It is not A or B because the lac operon does not get transcribed when the repressor protein is present. It is not D because for the lac operon to be transcribed you need lactose to be present and glucose to be absent. For the operon to be transcribed you need lactose present to remove the repressor protein from the DNA segment, glucose to be absent so that cAMP can be produced and bind to the CAP protein and activate the enzyme that transcribes the protein. Hope this helps.
