Explain the expression of lac operon genes in E. coli growing in lactose
containing culture medium. (5 marks)
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in an E coli growing in a growth medium containing glucose the only carbon source lac operon is off if we add factors to the growth radium the lac operon
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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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