Final answer:
Oxidoreductases are enzymes that catalyze oxidation-reduction reactions, removing electrons from one substrate and adding them to another. Examples include lactate dehydrogenase and transaminases.
Step-by-step explanation:
Oxidoreductases are enzymes that catalyze oxidation-reduction reactions. They can remove electrons from one substrate and add them to another. For example, lactate dehydrogenase reduces pyruvate and oxidizes lactate. Another example is the transfer of amino groups catalyzed by transaminases.