When lactose is present, it

  1. binds to the repressor, changing its shape so it cannot bind the operator
  2. binds to the promoter
  3. binds to RNA polymerase
  4. destroys the operator
Answer

A) binds to the repressor, changing its shape so it cannot bind the operator

Inducer inactivates repressor. AS & A Level Biology · Topic 16 Inheritance · 16.3 Gene control

Biology MCQ · More A Level Biology: Inheritance MCQs · Practise