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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.

Column-$I$	Column-$II$
$(i)$ Operator site	$(a)$ Codes for enzyme (protein)
$(ii)$ Promoter site	$(b)$ Codes for repressor
$(iii)$ Structural gene	$(c)$ Binding site for $RNA$ polymerase
$(iv)$ Regulator gene	$(d)$ Binding site for repressor

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?

Similar Questions

Match Column-$I$ with Column-$II$:

Column-$I$ Column-$II$

$(i)$ Operator site $(a)$ Codes for enzyme (protein)

$(ii)$ Promoter site $(b)$ Codes for repressor

$(iii)$ Structural gene $(c)$ Binding site for $RNA$ polymerase

$(iv)$ Regulator gene $(d)$ Binding site for repressor

The differentiation of organs and tissues in a developing organism is associated with:

In eukaryotic organisms,gene expression regulation cannot occur at which of the following levels?

Few genes are found in all types of cells of differentiated multicellular organisms of higher classes. These are called:

Which of the following switches off the $lac$ operon?

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