WB JEE Medical WB JEE Medical Solved Paper-2013

  • question_answer
    Which enzyme/s will be produced in a cell in which there is a non-sense mutation in the lac Y gene?

    A)  \[\beta -\]galactosidase

    B)  Lactose permease

    C)  Transacetylase

    D)  Lactose permease and transacetylase

    Correct Answer: A

    Solution :

     \[\beta -\]galactosidase is a structural gene present in segment of DNA, which carry Icdes for the synthesis of protein. Mutation in the /ac Ygene of E.coli needs residues of  ytoplasmic enzyme \[\beta -\]galactosidase. Lactose permease is a membrane protein, which is a major facilitator superfamily. Transacetylase is an enzyme transferring acetyl groups from one compound to another.


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