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Sagot :
When both glucose and lactose are present in the media in which E. coli is growing the preferred carbon source of is glucose.
About lac operon:
- The lac operon of E. coli contains genes involved in lactose metabolism which is expressed when lactose is present and glucose is absent.
- The lac repressor and catabolite activator protein (CAP) are two regulators that control the operon's "on" and "off" states in response to lactose and glucose concentrations.
- A lactose sensor is the lac repressor. When lactose is present, it ceases to function as a repressor, blocking transcription of the operon in its usual state. Through isomer allolactose, the lac repressor indirectly detects lactose.
- The CAP serves as a glucose sensor. It starts the operon's transcription, but only when the blood glucose level is low. Through the chemical cAMP, CAP detects glucose in an indirect manner.
Learn more about the Lac operon with the help of the given link:
https://brainly.com/question/2562849
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