Carbohydrate
The conversion of pyruvate to lactate is catalysed by

lactate dehydrogenase
pyruvate dismutase
pyruvate carboxylase
pyruvate decarboxylase

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Carbohydrate
The glycosidic bond

both (b) and (c)
in sucrose is hydrolyzed by bees
in maltose is not hydrolyzed in lactose intolerant humans
joins glucose and fructose to form sucrose

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