Describe the effect a repressor has on the lac operon when lactose is present.
2007-02-20 10:16:59 · 3 answers · asked by Nina N 1 in Science & Mathematics ➔ Biology
No effect, the lactose binds to the repressor and inactivates it.
2007-02-21 03:46:46 · answer #1 · answered by floundering penguins 5 · 0⤊ 0⤋
Lac operon: If lactose is absent from a cell the enzymes will not be made. If the sugar enters the cell, the operon will be switched on and produce the enzymes needed to digest the lactose.
Lactose metabolism in E. coli is programmed by the lac operon which has three structural genes. lac.Z codes for B-glactosidase which hydrolyzes lactose.
lac. Y codes for permease, a membrane protein that transports lactose into the cell, and lac A codes for transacetylase, an enzyme that has no known action in lactose metabolism. Lactose acts as an inducer to turn on the operon.
2007-02-23 16:23:54 · answer #2 · answered by ATP-Man 7 · 0⤊ 0⤋
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2016-10-16 03:11:56 · answer #3 · answered by ? 4 · 0⤊ 0⤋