P

lacZ

No transcription

Structural genes lacZ

lacY

lac A

No transcription

Presence of lactose

Transcription and translation

Active regulator protein

Inactive regulator protein (repressor)

Allolactose

12 When lactose is present, some of it is converted into allolactose,...

RNA polymerase lacO operator

Transcription and translation

Active regulator protein

Inactive regulator protein (repressor)

. which then binds to the regulatory protein, making the protein inactive

The regulatory protein cannot bind to the operator,...

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