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which prevents the Lac genes in the DNA of E. coli from being expressed most of the time

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The Lac repressor prevents the Lac genes in the DNA of E.coli from being expressed most of the time. The Lac repressor is actually a kind of DNA binding protein. It is a fact that in case there is an absence of lactose, the Lac repressor binds to the proteins. I hope that this answer comes to your help.

Answer:

The correct answer would be lac repressor.

Lac repressor refers to the DNA binding protein which inhibits or prevents the expression of genes in the DNA of Lac Operon.

The lac repressor protein is expressed by the Lac regulatory region.

It binds to the operator region of the operon and prevents the binding of RNA polymerase.

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