During class today, we will be completing part A (and part b through the beginning of step 7) Effect of Temperature on Enzyme Activity p54 For your warm up, Read part A of the lab procedure. DO NOT WRITE THE PROCEDURE DOWN YET. Make a labeled diagram of each step of part A. Put the book away. Use your diagram to write out the steps of the procedure, Construct a materials list, and Create an empty table in which to record your data. Biology Warm Up (modified 9/16) Remember to substitute “potato,” everywhere the book says, “liver.”

Effect of Temperature on Enzyme Activity p54 For your warm up, Read part A of the lab procedure. DO NOT WRITE THE PROCEDURE DOWN YET. Make a labeled diagram of each step of part A. Put the book away. Use your diagram to write out the steps of the procedure, Construct a materials list, and Create an empty table in which to record your data. Biology Warm Up (modified 9/16) Remember to substitute “potato,” everywhere the book says, “liver.”

2.4 Chemical Reaction and Enzymes Chemical Reaction one set of chemicals changes into another set of chemicals. changes in chemical bonds Reactants enter into reaction Products are produced

2.4 Chemical Reaction and Enzymes 2H 2 + O 2 Reactants 2H 2 O Product

2.4 Chemical Reaction and Enzymes Chemical Reaction Can be slow: Iron oxidizing (rust) Can be fast: Hydrogen and Oxygen exploding

Energy Exothermic Energy is released 2H 2 + O 2 2H 2 O + energy Endothermic Energy is absorbed 2H 2 O 2H 2 + O 2 Energy +

Activation Energy Energy required to get a reaction started 2H 2 + O 2 2H 2 O + energy

Activation Energy Energy required to get a reaction started 2H 2 + O 2 2H 2 O + energy Catalysts Speed a reaction by lowering activation energy Enzymes Proteins that serve as catalysts in biological systems

Enzyme Action Enzymes provide a site for reactants to be brought together Temperature and pH can affect the shape of enzymes and reduce their effectiveness Enzyme Animation