What is the purpose of the operator and repressor in the lac operon?

What is the purpose of the operator and repressor in the lac operon?
  1. To synthesise RNA polymerase
  2. To bind to the promoter region
  3. To bind a transcription factor
  4. To repress the expression of beta-galactosidase

Solution

The lac operator is present only in the lac operon and it interacts specifically with the lac repressor protein to repress the expression of beta-galactosidase.

Asked in: NCERT

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