Problem: How does the lactose regulate the inducible system for transcription of the structural and regulatory genes of the lac operon?

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Lactose play a very big role in the regulation of gene transcription of lac operon. The lac operon is only switched “on” when there are no traces of glucose and lactose is the only sugar available to be used as energy. 

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How does the lactose regulate the inducible system for transcription of the structural and regulatory genes of the lac operon?