Which one of the following accurately describes the Lac operon?

ARNA polymerase is prevented from transcribing the lac genes when lactose is present.
BRNA polymerase transcribes the lac genes when lactose isn't present.
CThe repressor protein binds to the operator when lactose is present.
DThe repressor is freed from the operator when lactose is present.

Question

21-12-2015
Biology

Answered

Which one of the following accurately describes the Lac operon?

ARNA polymerase is prevented from transcribing the lac genes when lactose is present.
BRNA polymerase transcribes the lac genes when lactose isn't present.
CThe repressor protein binds to the operator when lactose is present.
DThe repressor is freed from the operator when lactose is present.

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taskmasters taskmasters · Answer 1 · 2015-12-23T09:01:11-05:00

Option D is the one most accurately describing Lac Operon.

The lac operon is known as an inducible system. Since Lac operon is an inducible system, it will only activate in the presence of a key molecule . The key molecule, lactose, induces the Lac operon to be activated.

Once lactose binds to the repressor, it causes it to be removed. RNA polymerase is then able to access the genes in the Lac operon and transcribe them in RNA and eventually proteins.