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What is the primary function of the lac operon in E. coli?

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Question: What is the primary function of the lac operon in E. coli?

Options:

  1. To regulate amino acid synthesis
  2. To control lactose metabolism
  3. To enhance DNA replication
  4. To promote cell division

Correct Answer: To control lactose metabolism

Solution: 

The lac operon regulates the metabolism of lactose in E. coli by controlling the expression of genes required for lactose uptake and breakdown.

What is the primary function of the lac operon in E. coli?

Practice Questions

Q1
What is the primary function of the lac operon in E. coli?
  1. To regulate amino acid synthesis
  2. To control lactose metabolism
  3. To enhance DNA replication
  4. To promote cell division

Questions & Step-by-Step Solutions

What is the primary function of the lac operon in E. coli?
  • Step 1: Understand that the lac operon is a group of genes in E. coli.
  • Step 2: Know that these genes are involved in using lactose as a source of energy.
  • Step 3: Learn that the lac operon controls when these genes are turned on or off.
  • Step 4: Recognize that when lactose is present, the lac operon helps the bacteria take in and break down lactose.
  • Step 5: Conclude that the primary function of the lac operon is to regulate lactose metabolism.
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