Ch. 16 Lactose Metabolism & lac Operon: Regulation
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5 Terms
1
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What does permease do?
Transports lactose into the cell.
2
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What does β-galactosidase do?
Breaks lactose into glucose and galactose; also converts lactose into allolactose.
3
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What does allolactose do?
Binds the repressor to inactivate it and allows transcription.
4
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What happens without lactose?
Repressor binds to operator → no transcription.
5
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What happens with lactose present?
Allolactose binds repressor → repressor can't bind operator → transcription on.
Note 
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