Question

Given below are two statements regarding Lac operon.
Statement (I): In Lac operon, in the absence of lactose, repressor protein binds to the operator gene and represses the process.
Statement (II): The lactose acts as an inducer of its own break down.
In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement (I) and Statement (II) are correct.
• B. Both Statement (I) and Statement (II) are incorrect.
• C. Statement (I) is correct but Statement (II) is incorrect.
• D. Statement (I) is incorrect but Statement (II) is correct.

Hint:

Without lactose the repressor blocks the operator, and lactose (allolactose) inactivates the repressor so its own breakdown enzymes are made.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
The lac operon is controlled by a repressor made by the regulator gene.

Step 2: Statement (I)
With no lactose, the repressor binds the operator and RNA polymerase cannot transcribe the structural genes. This is true.

Step 3: Statement (II)
Lactose (as allolactose) binds the repressor and frees the operator. The operon then makes \(\beta\)-galactosidase, which breaks down lactose. So lactose induces its own breakdown, and this is true.

Step 4: Conclusion
Both statements are correct.

Final Answer:
Both Statement (I) and Statement (II) are correct. \[ \boxed{\text{(A) }\text{Both Statement (I) and Statement (II) are correct.}} \]