Question

Explain how does operon gets switched on and off

Answer 1

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Operon is the functioning unit of gene .

According to the requirements the gene have to on or off.
e.g.- When there is abundant glucose in the blood the insulin should secret so that the cell uptake the glucose present outside . Which means the gene which produces insulin has to turned on .


Hope it helps. ❤❤

Answer 2

Answer

✏ When E.coli is cultured in medium containing lactose, E.coli needs enzymes for the breakdown of lactose.

✏So the lac operon is switched on or off.

✏Under such a condition the lactose enters the E.coli.

✏It gets modified into an inducer substance and binds with the repressor protein thus repressor protein structure is modified.

✏Repressor cannot bind to the operator gene.

✏Therefore the operator gene is free, it induces the RNA polymerase to bind with promoter gene.