In the absence of lactose, what is the state of the lac operon?

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Question: In the absence of lactose, what is the state of the lac operon?

Options:

Correct Answer: Inactive

Solution:

In the absence of lactose, the lac operon is inactive because the lac repressor binds to the operator, blocking transcription.

In the absence of lactose, what is the state of the lac operon?

In the absence of lactose, what is the state of the lac operon?

Step 1: Understand what the lac operon is. It is a group of genes in bacteria that help them digest lactose.
Step 2: Know that lactose is a sugar that can be used for energy.
Step 3: Realize that when there is no lactose present, the bacteria do not need to digest it.
Step 4: Learn about the lac repressor, which is a protein that can block the lac operon.
Step 5: In the absence of lactose, the lac repressor binds to a specific part of the operon called the operator.
Step 6: When the repressor is bound to the operator, it prevents the genes from being turned on.
Step 7: Therefore, the lac operon is inactive because the repressor blocks the process needed to make the proteins for digesting lactose.

Lac Operon Regulation – The lac operon is a set of genes involved in lactose metabolism in bacteria, regulated by the presence or absence of lactose.
Repressor-Operator Interaction – In the absence of lactose, the lac repressor protein binds to the operator region of the lac operon, preventing RNA polymerase from transcribing the genes.