Question -
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
Options:
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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