2 H202 ...---> 2 H20 + 02 hydrogen peroxide
water orygen
1. *What is the enzyme in this reaction?
a. Hydrogen peroxide
b. Catalase
c. Water
d. Oxygen

The enzyme is b. Catalase

Explanation:

Catalases are ubiquitous biological catalysts or enzymes, that speed up reaction rates.  Here, they mediate hydrogen peroxide decomposition into water and oxygen.  They are essential in organisms on Earth exposed to oxygen as they protect cells from oxidative damage.

hydrogen peroxide                     water      + oxygen

Reactive oxygen species, or free radicals are very reactive-  they can cause damage to DNA molecules, RNA and proteins, leading to cell death.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: