Answer:
it changed shape
Step-by-step explanation:
Catalase is an enzyme that catalyses the decomposition of hydrogen peroxide to water and oxygen. Like every enzyme, the catalase molecule is a proteinous molecule. Every protein is made up of AMINO ACIDS, which serves as the building block of the protein.
The function of every proteinous molecule like enzymes is dependent on the specificity of the amino acid that makes it up. The specificity of an amino acid is a result of the 3D shape it forms. This means that the shape of the amino acid contained in a protein molecule determines it's functionality.
A protein is said to be DENATURED when its shape is altered either by high temperature, change in pH etc. Therefore, exposure of catalase molecule, which is a protein molecule, to high heat and acid will cause its shape to change i.e. cause it to denature.