What conditions must be present for transcription of the Lac Operon genes? What is the function of a repressor protein if lactose is absent?

Answer 1

Lactose must bond to the repressor.

The repressor blocks the transcription of the lac genes when lactose isn't bonded to it, but is inhibited when lactose is bonded to it (meaning the repressor no longer blocks transcription).

Here's a picture: (2 is the repressor and 5 is the lactose)

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Answer 2

Benjamin Alvin

For transcription of the Lac Operon genes, the conditions required are:

Presence of lactose
Absence of glucose

If lactose is absent, the function of the repressor protein is to bind to the operator region, preventing RNA polymerase from transcribing the genes of the Lac Operon.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.