1. Launch Describe something that is extremely difficult for you to accomplish. Ex: taking a test or moving a couch. What would make this task easier?

2. You should be able to summarize the role of enzymes in chemical reactions

3.  http://www.youtube.com/watch?v=qDEVBMl diY8

4.  Chemical Reactions change substances into new substances.  In this reaction, lactose is a substrate. A substrate is what is acted on by the enzyme.

5.  Activation Energy: the amount of energy needed to start a chemical reaction

6.  How much activation energy was needed to do the difficult task we talked about?

7.  Enzymes (specialized proteins in our bodies) LOWER the activation energy of specific reactions.  Therefore ENZYMES make it easier for chemical reactions to occur in our bodies.

9.  When an enzyme is involved reactions can happen much faster.

10.  Each enzyme can only help along one reaction. This depends on the shape of the active site.

11.  How are enzymes involved in chemical reactions?  What is activation energy?  How do enzymes affect activation energy?  What is an enzyme’s active site?  What do we mean when we say an enzyme is specific?

12.  catalase 2H 2 O 2 ---------  2H 2 0 + O 2  What is the enzyme? What does it do in the reaction?  What is the substrate?  What are the products?

13.  Question: How does pH influence the activity of the enzyme catalase?  catalase 2H 2 O 2 ---------  2H 2 0 + O 2  Independent variable:  Dependent variable:  Control group:  Constants: