Answer:
c. binds to allolactose and becomes inactive, allowing lac gene expression to occur.
Explanation:
Interaction between allolactose and repressor leads to allosteric repulsion which makes repressor inactive leading to the lac gene expression. This is the reason why allolactose is known as the inducer of lac operon becasue it causes gene expression in lac operon.
In the absence of allolactose, the repressor binds the operator and does not allow RNA polymerase to do transcription.
In the lac operon, the repressor: c. binds to allolactose and becomes inactive, allowing lac gene expression to occur.
Option C is correct.
The lac operon also called the lactose operon is responsible for the movement and metabolism of lactose in Escherichia Coli. The structure of the lac operon houses the many sugars (lactose) that require different enzymes for their metabolism. These are lacZ, lacY, and lacA.
The lac repressor is a protein present in the lac operon whose function is to restrict the transcription of the lac operon. During the process, the lac repressor binds with allolactose, making it inactive.
When a tiny portion of lactose is readily present, the lac repressor binds to it, inducing disunion from the DNA operator and thus enabling the operon to be utilized for gene expression.
Therefore, we can conclude that In the lac operon, the repressor: c. binds to allolactose and becomes inactive, allowing lac gene expression to occur.
Learn more about lac operon here:
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