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Question
Till how long can the structural genes of lac operon be expressed?
Till how long can the structural genes of lac operon be expressed?
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Solution
The correct option is C Lactose concentration > Glucose concentration in the medium
The structural genes of the lac operon in E. coli are responsible for the degradation of the milk protein lactose. The lac operon is an inducible operon which works when lactose is present, whereas in the absence of lactose, the operator is blocked by a repressor protein. The structural genes are transcribed and expressed as long as lactose is present in greater quantities than glucose in the growth medium. When all lactose is converted into glucose and galactose, then the lac operon reaction stops expression.
The structural genes of the lac operon in E. coli are responsible for the degradation of the milk protein lactose. The lac operon is an inducible operon which works when lactose is present, whereas in the absence of lactose, the operator is blocked by a repressor protein. The structural genes are transcribed and expressed as long as lactose is present in greater quantities than glucose in the growth medium. When all lactose is converted into glucose and galactose, then the lac operon reaction stops expression.
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