noun[mass noun] Biochemistry
An enzyme which catalyses the hydrolysis of lactose to glucose and galactose.
- The enzyme lactase breaks down the lactose to galactose and glucose.
- Many people take extra doses of naturally produced enzymes, such as lactase, pepsin and trypsin, in supplement form.
- Lactose, the sugar present in milk, is split in the small intestine by the enzyme lactase into its constituent glucose and galactose molecules, allowing absorption of the glucose.
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