Molecular Basis of Inheritance Question 123

123. Gene regulation governing lactose operon of E.coli that involves the lac I gene product is :

[2015 RS]

(a) Negative and inducible because repressor protein prevents transcription

(b) Negative and repressible because repressor protein prevents transcription

(c) Feedback inhibition because excess of b-galactosidase can switch off trascription

(d) Positive and inducible because it can be induced by lactose

Show Answer

Answer : a

Hints & Solution

(a) Lac operon under control of repressor shows a negative regulation. Operon has inducible nature.



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