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| Modern Genetic Analysis Chapter 14. Regulation of Gene Transcription Regulation of the Lactose System Figure 14-4. The metabolism of lactose. The enzyme b -galactosidase catalyzes a reaction in which water is added to the b -galactosidase linkage to break lactose into separate molecules of galactose and glucose. The enzyme lactose permease is required to transport lactose into the cell.

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