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Select the two correct statements out of the four (a–d) given below about lac operon.


(i) Glucose or galactose may bind with the repressor and inactivate it

(ii) In the absence of lactose the repressor binds with the operator region

(iii) The z-gene codes for permease

(iv) This was elucidated by Francois Jacob and Jacque Monod


The correct statements are:


[2010]

  • a)
    (ii) and (iii)

  • b)
    (i) and (iii)

  • c)
    (ii) and (iv)

  • d)
    (i) and (ii)

Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Select the two correct statements out of the four (a–d) given be...
In lac operon, lactose acts as the inducer that binds with the repressor and inactivates it. This enables the operator to carry out the translation of the genes and produce enzymes. If glucose is present in the system there is no need of lac operon as it is the preferred substrate. Since galactose is not an inducer it cannot bind with the repressor.


In the absence of lactose repressor binds with the operator and does not allow translation of the genes and hence no enzymes will be formed.


The lac z gene codes for galactosidase enzyme. Permease is encoded by lac y gene.
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Most Upvoted Answer
Select the two correct statements out of the four (a–d) given be...
The correct statements are:

1) "The sun rises in the east and sets in the west."
2) "Water boils at 100 degrees Celsius at sea level."
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Select the two correct statements out of the four (a–d) given below about lac operon.(i) Glucose or galactose may bind with the repressor and inactivate it(ii) In the absence of lactose the repressor binds with the operator region(iii) The z-gene codes for permease(iv) This was elucidated by Francois Jacob and Jacque MonodThe correct statements are:[2010]a)(ii) and (iii)b)(i) and (iii)c)(ii) and (iv)d)(i) and (ii)Correct answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Select the two correct statements out of the four (a–d) given below about lac operon.(i) Glucose or galactose may bind with the repressor and inactivate it(ii) In the absence of lactose the repressor binds with the operator region(iii) The z-gene codes for permease(iv) This was elucidated by Francois Jacob and Jacque MonodThe correct statements are:[2010]a)(ii) and (iii)b)(i) and (iii)c)(ii) and (iv)d)(i) and (ii)Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Select the two correct statements out of the four (a–d) given below about lac operon.(i) Glucose or galactose may bind with the repressor and inactivate it(ii) In the absence of lactose the repressor binds with the operator region(iii) The z-gene codes for permease(iv) This was elucidated by Francois Jacob and Jacque MonodThe correct statements are:[2010]a)(ii) and (iii)b)(i) and (iii)c)(ii) and (iv)d)(i) and (ii)Correct answer is option 'C'. Can you explain this answer?.
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