اپران لاکتوزLac Operon–The Lac Operon is an inducible operon in Escherichia coli that controls the…
انتشار: 2026/07/27 08:40 UTCدریافت: 2026/08/04 20:22 UTCآخرین مشاهده: 2026/08/04 20:22 UTC
اپران لاکتوزLac Operon–The Lac Operon is an inducible operon in Escherichia coli that controls the metabolism of lactose.Components•Regulatory gene (lacI): Produces the repressor protein.•Promoter (P): Site where RNA polymerase binds.•Operator (O): Acts as the on/off switch for transcription.Structural genes:•lacZ: Produces β-galactosidase (breaks lactose into glucose and galactose).•lacY: Produces permease (helps lactose enter the cell).•lacA: Produces transacetylase.Working•Without lactose: Repressor binds to the operator → RNA polymerase is blocked → Structural genes are not transcribed (Operon OFF).•With lactose: Lactose is converted to allolactose (the inducer), which binds to the repressor → Repressor leaves the operator → RNA polymerase transcribes the structural genes → Enzymes for lactose metabolism are produced (Operon ON).https://t.me/arshadbehdasht2microb

