Plan
Aim: To investigate the rate of the effect of Catalase on hydrogen peroxide.
Introduction This investigation will be carried out to investigate the rate of reaction of the enzyme catalase on the substrate hydrogen peroxide.
Enzymes are biological catalysts, which speed up the rate of reaction without being used up during the reaction, which take place in living organisms. They do this by lowering the activation energy. The activation energy is the energy needed to start the reaction.
Enzymes are essentially proteins and will only act in an aqueous environment. An enzyme is specific for a certain reaction or type of reaction. The way enzymes work is called the ‘Lock and Key’ mechanism. The enzyme acts as the lock and the substrate acts as the key. The two fit together in the active site of an enzyme, and are said to be complimentary. The substrate and enzyme, when combined together is called an enzyme substrate complex.
There are two types of enzymes: -
Builder enzymes- These speed up chemical reactions or small chemicals, which have been joint together to make larger ones.
Breaker enzymes: - These speed up chemical reactions breaking down molecules into smaller ones. An example of a breaker enzyme is Catalase.
Enzymes have certain conditions in which they work best. They have to be in conditions of a certain temperature and pH or can denature or deactivate.
If they are at too high a temperature the enzyme is denatured and destroyed. If kept at too low a temperature the enzyme is deactivated but not destroyed.
Catalase is complementary to hydrogen peroxide and breaks it down into water and oxygen. The enzyme Catalase is found in the body in a number of organs and tissues. This includes the liver where the job of the enzyme is to decompose hydrogen peroxide into oxygen and water. It is necessary for the Catalase to break down the