Lac Operon Flashcards

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1
Q

What happens when there is no lactose?

A
  • the lac repressor protein binds to the operator
  • prevents RNA polymerase from binding
  • structural genes not transcribed
  • no transcription
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2
Q

What are examples of structural genes?

A
  • B-galactosidase
  • lactose permease
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3
Q

what is a regulator gene?

A
  • makes transcription factors that control the expression of other genes
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4
Q

what are structural genes?

A
  • makes proteins that function in the cell.
  • e.g. enzymes
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5
Q

what happens if lactose is present?

A
  • lactose binds to the receptor protein which changes shape
  • removes it from the operator
  • RNA polymerase can bind to the promoter
  • structural genes are expressed
    ( transcribed here + translated in the cytoplasm)
  • B-galactosidase + lactose permease
    are made
  • structural gene are transcribed
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6
Q

what are most the genes made from?

A
  • nucleotides
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