Which Reaction is Normally Catalyzed by the Enzyme Catalase in the Peroxisome

Question

Which reaction is normally catalyzed by the enzyme catalase in the peroxisome?
A) 2O₂- + 2H⁺ → H₂O₂ + O₂
B) FMNH₂ + O₂ → FMN + H₂O₂
C) C₂H₅OH (ethanol) + NAD⁺ → C₂H₄O (acetaldehyde) + NADH + H⁺
D) 2H₂O₂ → 2H₂O + O₂
E) Both C and D above

Accepted Answer

Decomposition of hydrogen peroxide (produced as a result of cellular reactions such as those presented in A and B) into water and molecular oxygen is an important role fulfilled by catalase. The enzyme can also engage in peroxidation reactions such as the conversion of ethanol to acetaldehyde, but it uses H₂O₂, not NAD⁺, as the oxidant.