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When is gene expression blocked in the lac operon system?


The repressor protein destroys the genes required to produce enzymes.


The repressor protein blocks the genes from making mRNA.

Lactose binds to the repressor and changes its shape.


RNA polymerase begins transcribing the genes.

Respuesta :

Answer:

B

Explanation:

The repressor protein blocks the genes from making mRNA

Gene expression is blocked by the repressor in the lac operon system. Option B is correct.

Lac operon system:

  • When multiple gene's expression is controlled by a single promotor then it is called an operon.
  • In the presence of enough glucose, Operon blocks the expression of the genes by binding a repressor protein with the operator site.
  • When lactose is present in the media some lactose enters into the bacteria and inhibits the repressor and the gene is expressed.

Therefore, gene expression is blocked by the repressor in the lac operon system.

Learn more about the Lac operon system:

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