Chemical Reaction A process that changes one set of substances into a new set of sub. Chem rxns can occur too slowly and need help. Catalyst –speeds up a chemical rxn (without being used up)

Enzyme Type of catalyst Reduces the amount of activation energy needed for a chem rxn to occur Protein

Activation Energy

Parts of an Enzyme Substrate – The components of the reaction that bind to the enzyme Active Site – The region of the enzyme where the substrates bind

Lock and Key A single enzyme is able to catalyze only one rxn. The shape of an active site fits only the shape of its substrates. The “induced fit” model

Regulation Enzymes can be affected by variables – Temperature, pH What temperature and pH do you think enzymes work best in our body?

Catalase Catalase is an enzyme that removes Hydrogen Peroxide H 2 O 2 + catalase  H 2 O + O 2 Catalase is found in blood and damaged cells, also in the liver and potatoes