Bio 102 exam 4 (gene regulation + cell communication)

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10 Terms

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Operon

  • Series of protein-coding regions in bacteria under the control of a single regulatory region

    • Regulatory region followed by multiple coding regions

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Lac operon purpose

Breaks down lactose

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Parts of lac operon

  • Promoter

  • Operator

  • lacZ

  • lacY

  • lacA

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LacY protein

Channel protein, allows lactose into cell

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LacZ

Enzyme that breaks down lactose into glucose and galactose 

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LacI

  • transcription factor (repressor)

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lac operon in absence of lactose

Lac operon is blocked by LacI repressor

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lac operon in presence of lactose

LacI binds to allolactose and loses its affinity for DNA

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basal expression

In absence of LacI repression, the operon is transcribed at low levels

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