Catalase is an enzyme that catalyzes the decomposition of hydrogen peroxide (H2O2) to water (H2O) and oxygen (O2). This reaction is important in protecting cells from the toxic effects of hydrogen peroxide, which can cause oxidative damage to DNA, proteins, and lipids.

The overall reaction catalyzed by catalase can be represented as follows:

2 H2O2 → 2 H2O + O2

This reaction is catabolic because it breaks down a complex molecule (hydrogen peroxide) into simpler molecules (water and oxygen). Catabolic reactions release energy, which can be used by the cell to perform various functions. In the case of catalase, the energy released from the decomposition of hydrogen peroxide is used to protect the cell from oxidative damage.