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In Biology / College | 2025-07-05

Mechanism by which the presence of glucose inhibits the lac operon.
A) blocks DNA replication of the lac gene
B) blocks translation of the lac mRNA
C) blocks RNA polymerase from binding to the DNA
D) blocks RNA polymerase from transcribing the DNA

Asked by aubslovespink

Answer (2)

Glucose inhibits the lac operon through a process called catabolite repression, reducing cyclic AMP levels, which in turn decreases RNA polymerase's ability to bind to the lac operon promoter. This regulation ensures that the operon is not expressed when glucose is available. The correct answer is C) blocks RNA polymerase from binding to the DNA .
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Answered by Anonymous | 2025-07-05

The presence of glucose inhibits the lac operon through a mechanism called catabolite repression, which prevents cAMP production. Lower cAMP levels lead to reduced binding of RNA polymerase to the lac operon promoter. Therefore, glucose effectively regulates the expression of genes needed for lactose metabolism. ;

Answered by GinnyAnswer | 2025-07-05

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