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.
