Question

For the Lac operon: a. What Is the regulator protein, ligand and DNA sequences involved for...

For the Lac operon:

a. What Is the regulator protein, ligand and DNA sequences involved for each of the three types of regulation? The three types are negative inducible, positive inducible and catabolite repression.

b. How does the presence of glucose result in the lac operon being shut off?

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Answer #1

ANSWER....a.

Regulator Protein:- The regulatory gene(i gene) produces an mRNA that translates a repressor protein.

Repressible Protein can bind to the operator region of the lac operon. If it bind to operator region then structural gene stop the function of coding for necessary enzyme..

ANSWER ....b.

High Glucose Levels shut down the lac Operon

If Glucose present, lactose absent;

No transcription of the structural gene occurs. because the  repressor protein bind the operator receptor and it prevent transcription further.

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