| convertase | (noun) any of several enzymes that convert a compound into smaller, biologically-active compounds. | - |
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| elastase | (noun) a pancreatic enzyme that catalyzes the hydrolysis of elastin | - |
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| invertase | (noun) an enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose | Synonyms: saccharase, sucrase |
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| lactase | (noun) any of a group of enzymes (trade name Lactaid) that hydrolyze lactose to glucose and galactose | Synonyms: Lactaid |
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| oxidoreductase | (noun) an enzyme that catalyzes oxidation-reduction | - |
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| phosphatase | (noun) any of a group of enzymes that act as a catalyst in the hydrolysis of organic phosphates | - |
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| reductase | (noun) an enzyme that catalyses the biochemical reduction of some specified substance | - |
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| secretase | (noun) a set of enzymes believed to snip pieces off a longer protein producing fragments of amyloid protein that bunch up and create amyloid protein plaques in brain tissue (the pathological hallmark of Alzheimer's) | - |
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| transcriptase | (noun) the enzyme that copies DNA into RNA | Synonyms: RNA polymerase |
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