Test: GRE Subject Test: Biology

1.

The lac operon is typically found in prokaryotes in order to utilize lactose in the event that glucose is absent. How does the presence of lactose affect the lac operon?

It binds to the promoter, signaling the polymerase to attach

It attaches to the operator, blocking polymerase from attaching

It binds to the lac repressor, causing it to detach from the operator

It stimulates the transcription of the lac repressor gene

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