Question:
In lac operon, which enzyme is NOT directly involved in lactose metabolism?
In lac operon, which enzyme is NOT directly involved in lactose metabolism?
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Lac operon: lacZ (\(\beta\)-galactosidase), lacY (permease), lacA (acetylase).
Helicase: DNA replication enzyme.
Helicase: DNA replication enzyme.
Updated On: Aug 18, 2026
- \(\beta\)-Galactosidase
- Permease
- Acetylase
- Helicase
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
The lac operon contains genes for lactose metabolism.
Each gene encodes a specific enzyme.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the lac operon genes.
Step 3: Detailed Explanation:
Lac operon genes and their products:
- lacZ: \(\beta\)-galactosidase (A).
- lacY: permease (B).
- lacA: acetylase (C).
Helicase is not part of the lac operon.
It is involved in DNA replication.
Thus, helicase is NOT directly involved in lactose metabolism.
Step 4: Final Answer:
Helicase is NOT directly involved in lactose metabolism.
Hence, the correct option is (D).
The lac operon contains genes for lactose metabolism.
Each gene encodes a specific enzyme.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the lac operon genes.
Step 3: Detailed Explanation:
Lac operon genes and their products:
- lacZ: \(\beta\)-galactosidase (A).
- lacY: permease (B).
- lacA: acetylase (C).
Helicase is not part of the lac operon.
It is involved in DNA replication.
Thus, helicase is NOT directly involved in lactose metabolism.
Step 4: Final Answer:
Helicase is NOT directly involved in lactose metabolism.
Hence, the correct option is (D).
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