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NEET 2010 Biology question

BiologyMolecular Basis of InheritanceNEET 2010

Select the two correct statements out of the four (a-d) given below about lac operon. (a) Glucose or galactose may bind with the repressor and inactivate it (b) In the absence of lactose the repressor binds with the operator region (c) The z-gene codes for permease (d) This was elucidated by Francois Jacob and Jacques Monod The correct statements are

Answer: (2)

Solution

(b) is correct: in the absence of lactose (inducer) the repressor, produced by the i gene, binds to the operator and blocks RNA polymerase, so the structural genes are not transcribed. (d) is correct: the lac operon was elucidated by Francois Jacob and Jacques Monod. (a) is

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Question ID VK-090595