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NEET Biology question

BiologyMolecular Basis of InheritanceNEET

Which of the following statements concerning the regulatory genes (R), associated with the lac operon, is incorrect? I. mRNA is transcribed from the R gene whether lactose is present or not. II. mRNA is transcribed from the R gene only when lactose is present. III. mRNA is transcribed from the R gene only when lactose is not present. IV. Lactose inhibits the translation of R gene mRNA.

Answer: (D)

Solution

The regulatory (i) gene is expressed constitutively, i.e., mRNA is transcribed from it regardless of whether lactose is present (making I correct and II, III

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Question ID VK-120812