A low level of expression of lac operon occur | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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

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

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?

Statement-$I$: Lac operator is present only in lac operon and it interacts specifically with lac-repressor only.
Statement-$II$: Each operon has its specific operator and specific repressor.

Structural gene is monocistronic $- P$
Structural gene is polycistronic $- Q$
Select the correct option for $P$ and $Q$.
$\quad\quad\quad P \quad\quad Q$

In the $lac$ operon,the $lac$ $mRNA$:

Vedclass Test Series

Exam Paper Generator

Online Exam Module