BiologyAssertion (A): Regulation of lac operon by repressor is termed as negative regulation.Reason (R): Lac operon is not under control of positive regulation as well.

Assertion (A): Regulation of lac operon by repressor is termed as negative regulation.
Reason (R): Lac operon is not under control of positive regulation as well.

  1. A

    A and R are true and R is the correct explanation of A.

  2. B

    A and R are true and R is not the correct explanation of A

  3. C

    A is true, R is false

  4. D

    Both A and R are false

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    Solution:

    The activity of the promoter that controls the expression of the lac operon is regulated by two different proteins. One of the proteins prevents the RNA polymerase from transcribing (negative control), the other enhances the binding of RNA polymerase to the promoter (positive control).

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