KVPY Sample Paper KVPY Stream-SX Model Paper-21

  • question_answer
    In lac operon, if mutation occurs in the middle gene of the structural gene, then

    A) p-galactosidase will not be synthesised

    B) permease will not be synthesized

    C) transacetylase will not be synthesized

    D) lactose digestion will he rapid

    Correct Answer: B

    Solution :

    If the mutation occurs in the middle gene of structural gene, i.e. ?y?gene permease will not be synthesised. Lac operon is a transcriptionally regulated system where a polycistronic structural gene is regulated by a common promoter and regulatory gene. It has three structural genes, i.e. z, y,\[\alpha ,\] out of which 'z' gene codes for \[\beta \text{-}\]galactosidase, ?y? gene, i.e. middle gene codes for permease and \['\alpha '\] gene codes for transacetylase.

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