Which of the following occurs when lactose is present in the environment of E. coli?
A) The lac repressor binds to the promoter.
B) RNA polymerase binds to the operator.
C) No genes are transcribed.
D) RNA polymerase binds to the promotor.
E) Lactose binds to the promotor.

Question

Quizplus · Accepted Answer

When lactose is present in the environment of E. coli, it binds to the lac repressor, causing it to change shape and release from the operator. This allows RNA polymerase to bind to the promoter and initiate transcription of the genes involved in lactose metabolism. Therefore, RNA polymerase binds to the promoter in the presence of lactose.

Which of the Following Occurs When Lactose Is Present in the Environment