Question

Which of the following is a protein produced by a regulatory gene near the lac operon?...

Which of the following is a protein produced by a regulatory gene near the lac operon?

Group of answer choices

Operon

Promoter

Enhancer

Inducer

Repressor

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Answer #1

Answer = Repressor

The regulatory gene produces an mRNA that produces a Lac repressor protein, which can bind to the operator of the lac operon. A repressor protein is a DNA or RNA binding protein which inhibits the expression of genes by binding to the operator. An RNA binding repressor binds to the mRNA and prevents protein synthesis or translation of mRNA into protein. This kind of blocking of expression of DNA or RNA is called repression that is carried out by repressor protein.

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