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(C) In $E. coli$,the $lac$ operon is an inducible system regulated by both the presence of lactose and the absence of glucose. $1$. When both glucose

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After the complete consumption of glucose

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(C) In $E. coli$,the $lac$ operon is an inducible system regulated by both the presence of lactose and the absence of glucose. $1$. When both glucose and lactose are present,$E. coli$ preferentially utilizes glucose because it is a simpler sugar,and the $lac$ operon remains in the 'switch off' state due to catabolite repression. $2$. Once glucose is completely consumed,the cell switches to lactose metabolism. $3$. The presence of lactose allows it to act as an inducer,binding to the repressor protein and preventing it from binding to the operator. $4$. Therefore,the $lac$ operon is switched on only after the complete consumption of glucose,allowing the bacteria to utilize lactose.

If $E. coli$ is grown in a culture medium containing both glucose and lactose as carbon sources,when will its $lac$ operon be in the 'switch on' state?

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