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A-Level Biology OCR A

Lac Lactose Binds Explain Operon Works Present Growth

Front Explain how the lac operon works when lactose is present in the growth medium.
Back Lac operon, lactose:
  • Lactose binds to repressor protein, causing it to change shape and it no longer binds to operator
  • As result, RNA polymerase can bind to promoter
  • Three structural genes are transcribed and proteins are synthesised

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