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NEET Biology Molecular basis of Inheritance / विरासत का आणविक आधार Question Bank Self Evaluation Test - Molecular Basis of Inheritance

  • question_answer
    Which enzymes will be produced in a cell in which there is a nonsense mutation in the lac Y gene?

    A) Lactose Permease

    B) Transacetylase

    C) Lactose permease and transcetylase

    D) \[\beta \]-galactosidase

    Correct Answer: D

    Solution :

    [d] A non-sense mutation is the one which stops polypeptide synthesis due to formation of a terminating or non-sense codon. e.g. ATT(UAA), ATC (UAG), ACT(UGA). The lactose or lac operon of Esherichia coli contains structural genes (z, y, a). If Y codes for termination of polypeptide chain then only the product of 'z' gene transcribe to form \[\beta \] galactosidase.


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