GCSE Biology: The effects of Catalase

Catalase is an enzyme which is in the liver and in potato cells. It breaks down Hydrogen Peroxide very quickly because it is poisonous and turns it into oxygen and water. This shows itself as bubbles.

Tube and ContentsHeight of oxygen foam
Large piece of uncooked potato7cm
Chopped up potato12cm
Distilled water0cm

The foam was oxygen bubbles and water. It came from the breaking down of hydrogen peroxide. The tube containing distilled water did not react because distilled water contains no catalase. Cooked potato would not react because the process of cooking denatured the enzyme.