LAC operon (16.3)

• LacZ

  Lactase
• LacY

  Permease
• LacA

  transacetylase
• Order of LAC operon components

  Promoter > operator > Structural gene: LacZ > LacY > LacA
• Which enzyme is involved in transcription?

  RNA polymerase
• RNA polymerase binds to the promotor
• Repressors bind to the operator
• Repressors block RNA polymerase
• LAC operon helps to regulate protiens that break down Lactose (sugar)
• LacI codes for Lac operon REPRESSOR
• Lactose binds to Lac repressor when present, making it unable to bind to operator, allowing transcription