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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

1. (a) (ii) and (iii)
2. (b) (i) and (iii)
3. (c) (ii) and (iv)
4. (d) (i) and (ii)

Correct answer: (c) (ii) and (iv)

Solution

Statement (ii) is correct because, without lactose, the lac repressor binds the operator and blocks transcription. Statement (iv) is also correct because the lac operon model was elucidated by François Jacob and Jacques Monod.

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