Question:
Which of the following is a correct statement about the lac operon?
Which of the following is a correct statement about the lac operon?
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Lac = Lactose. The operon only "turns on" (induced) when lactose is present and needs to be eaten!
Updated On: May 5, 2026
- It is constitutively expressed
- It is induced by lactose (allolactose)
- It codes for enzymes that metabolise glucose
- It is found in eukaryotes
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The Correct Option is B
Solution and Explanation
Step 1: Concept
The lac operon is a gene system in bacteria (prokaryotes) required for the transport and metabolism of lactose.
Step 2: Meaning
Induction refers to the process where a specific molecule (inducer) stimulates the expression of genes that are normally turned off.
Step 3: Analysis
Statement (A) is incorrect as the operon is inducible, not constitutive. Statement (C) is incorrect because it codes for enzymes to metabolize lactose, not glucose. Statement (D) is incorrect as operons are characteristic of prokaryotes.
Step 4: Conclusion
In the presence of lactose, allolactose acts as an inducer by binding to the repressor protein, allowing gene transcription to occur. Final Answer: (B)
The lac operon is a gene system in bacteria (prokaryotes) required for the transport and metabolism of lactose.
Step 2: Meaning
Induction refers to the process where a specific molecule (inducer) stimulates the expression of genes that are normally turned off.
Step 3: Analysis
Statement (A) is incorrect as the operon is inducible, not constitutive. Statement (C) is incorrect because it codes for enzymes to metabolize lactose, not glucose. Statement (D) is incorrect as operons are characteristic of prokaryotes.
Step 4: Conclusion
In the presence of lactose, allolactose acts as an inducer by binding to the repressor protein, allowing gene transcription to occur. Final Answer: (B)
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