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Discussion :: GATE Biotechnology

  1. An E. coli cell of volume 10-12 cm3 contains 60 molecules of lac-repressor. The repressor has a binding affinity (Kd) of 10-8 M and 10-9 M with and without lactose respectively, in the medium.
    Therefore the lac-operon is
    2. A.
    repressed and can only be induced with lactose.
    B.
    repressed and cannot be induced with lactose.
    C.
    not repressed.
    D.
    expressed only when glucose and lactose are present.

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    Answer : Option B

    Explanation :

    -NA-

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