The lacZ and lacY genes are transcribed when:

Question

Quizplus · Accepted Answer

The lacZ and lacY genes are part of the lac operon, which is regulated by both lactose and glucose levels in the cell. When lactose is present and glucose levels are low, the lacZ and lacY genes are transcribed, allowing the cell to utilize lactose as an energy source. This is known as "induction" of the lac operon. In the presence of high levels of glucose, even if lactose is present, the lac operon is "repressed" and the lacZ and lacY genes are not transcribed. Choice C correctly states that the genes are transcribed when lactose is present and glucose levels are low.

The LacZ and LacY Genes Are Transcribed When