Three enzymes are required in the metabolism of lactose in E coli , name the enzyme required for entry of lactose in the cell.
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The metabolism of lactoserequires two enzymes: a permease to transport lactoseinto the cell and β-galactosidase to cleave the lactose molecule to yield glucose and galactose (Figure 14-4). ... All three genes are transcribed into a single, multigenic messenger RNA (mRNA) molecule.
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RNA polymerase can then bind to the promoter and transcribe the lac genes.When lactose is present, the lac genes are expressed because allolactose binds to the Lac repressor protein and keeps it from binding to the lac operator. Allolactose is an isomer of lactose.
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