A low level of expression of lac operon occur | vedclass

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(B) In the complete absence of expression of the $lac$ operon,the enzyme permease will not be synthesized.Permease is essential for the transport of l

Vedclass · Accepted Answer

To allow the entry of lactose into the cell

Vedclass · Answer

(B) In the complete absence of expression of the $lac$ operon,the enzyme permease will not be synthesized.Permease is essential for the transport of lactose from the medium into the cell.If lactose cannot be transported into the cell,it cannot act as an inducer.Consequently,it cannot bind to the repressor protein to relieve the $lac$ operon from its repressed state.Therefore,a basal (low) level of expression is required to allow the initial entry of lactose into the cell.

$A$ low level of expression of lac operon occurs at all the time. Can you explain the logic behind this phenomenon?

Similar Questions

Assertion $(A):$ Regulation of $lac$ operon by repressor is referred to as negative regulation.
Reason $(R):$ Repressor protein binds to the operator region and prevents $\text{RNA}$ polymerase from transcribing the operon.

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

What is the location of the product of the $Lac \, y$ gene?

Which of the following is the substrate for $\beta$-galactosidase?

In an $E. coli$ strain,the $i$ gene gets mutated such that its product cannot bind the inducer molecule. If the growth medium is provided with lactose,what will be the outcome?

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