Discussion
Hydrogen peroxide is decomposed by the enzymes ______.
Answer: C
Hydrogen peroxide is decomposed into water and oxygen by the enzyme catalase. Lyases and isomerases are classes of enzymes that cleave bonds without hydrolysis and rearrange atoms within a molecule, and neither is the class that acts on hydrogen peroxide. 'Oxidoreductases' is the broad class to which catalase itself belongs, but the question names the enzyme that does the job, and the keyed answer is catalase. The reaction it speeds up is \[ 2\mathrm{H_2O_2} \to 2\mathrm{H_2O} + \mathrm{O_2} \] and catalase is found in nearly all organisms that live in oxygen.
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