Final answer:
Myeloperoxidase is an oxygen-dependent enzyme that kills pathogens by producing hypochlorous acid, which is a potent antimicrobial agent.
Step-by-step explanation:
The oxygen-dependent enzyme that kills pathogens is myeloperoxidase. Myeloperoxidase is an enzyme found in white blood cells and is involved in the immune response against pathogens. It catalyzes the production of hypochlorous acid, which is a potent antimicrobial agent that kills pathogens.