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NEET 2015
Exam
NEET
Year
2015
Subject
Zoology
Chapter
Molecular Basis of Inheritance

NEET 2015 · Zoology · Molecular Basis of Inheritance

Gene regulation governing lactose operon of E. coli that involves...

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

Options

  1. APositive and inducible because it can be induced by lactose
  2. BNegative and inducible because repressor protein prevents transcription
  3. CNegative and repressible because repressor protein prevents transcription
  4. DFeedback inhibition because excess of β\beta - galactosidase can switch off transcription

Correct answer

B. Negative and inducible because repressor protein prevents transcription

Step-by-step solution

In negative regulation, a repressor molecule binds to the operator of an operon and terminates transcription. The lac operon is a negatively controlled inducible operon, where the inducer molecule is allolactose.

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