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What is the role of lactose permease in the lac operon?

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Question: What is the role of lactose permease in the lac operon?

Options:

  1. To synthesize lactose
  2. To transport lactose into the cell
  3. To degrade lactose
  4. To inhibit the repressor

Correct Answer: To transport lactose into the cell

Solution: 

Lactose permease is a membrane protein that facilitates the transport of lactose into the E. coli cell.

What is the role of lactose permease in the lac operon?

Practice Questions

Q1
What is the role of lactose permease in the lac operon?
  1. To synthesize lactose
  2. To transport lactose into the cell
  3. To degrade lactose
  4. To inhibit the repressor

Questions & Step-by-Step Solutions

What is the role of lactose permease in the lac operon?
  • Step 1: Understand that the lac operon is a set of genes in E. coli that helps the bacteria use lactose as food.
  • Step 2: Know that lactose permease is a special protein found in the cell membrane of E. coli.
  • Step 3: Realize that the main job of lactose permease is to help transport lactose from outside the cell into the cell.
  • Step 4: Conclude that without lactose permease, E. coli would have a hard time getting lactose to use for energy.
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