What does lac operon of E. coli consist of? How is it switched on and off by the presence and
absence of lactose respectively?
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The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when lactose is present and glucose is absent. Two regulators turn the operon "on" and "off" in response to lactose and glucose levels: the lac repressor and catabolite activator protein (CAP).
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