1. Agenda -Introduction -Administrative matters -Getting to know you better -Lesson proper

2. Adminstrative Matters Rules: P R A C T Punctuality Respect Attitude Care & Concern Think Website: http://carolynkhoo.pbworks.com

3. Lesson Objectives 1. Recap on Digestion NEW 2. Enzymes

4. Lesson Objectives 1. Recap on Digestion 2. Enzymes

7. 7 Digestion Digestionis the breaking down of large, complex food molecules into small, simpler molecules . Digestion is aided by complex proteins called enzymes. The enzymes involved in digestion are called digestive enzymes.

9. Proteins  amino acids

10. Fats  glycerol + fatty acidssugars protease lipase

11. Lesson Objectives 1. Biological Molecules NEW 2. Enzymes

12. Lesson Objectives 2a. Why do we need enzymes? 2b. Definition of enzymes 2c. Properties of enymes

13. Enzymes 2a. Why do we need enzymes? 2b. Definition of enzymes 2c. Properties of enzymes

14. It’s DemoTime! Hydrogen peroxide experiment H2O2

15. It’s DemoTime! Do you believe that there is some reaction going on in this colorless solution? Do you believe that enzymes can speed up this reaction? What do you observe when the potato cubes are added to the solution? Why do you think the detergent was added? Why do you think KI was added?

16. Summary of Demo Hydrogen peroxide experiment 2 2H202 2H2O + O2

17. Catabolic Reaction Breaking down Release Energy E.g. The decomposition of H2O2 2H202 2H2O + O2 vs Enzymes Anabolic Reaction Building up Use up Energy E.g. Photosynthesis 6CO2 + 6H2OC6H12O6 + 6O2 Enzymes

18. Enzymes 2a. Why do we need enzymes? 2b. Definition of enzyme 2c. How do enzymes work? 2d. Properties of enzymes

19. Enzymes 2a. Why do we need enzymes? 2b. Definition of enzymes 2c. How do enzymes work? 2d. Properties of enzymes

20. Definition of Enzymes Enzymes are biological catalysts that alters/speed upthe rate of a chemical reaction and remains chemically unchanged at the end of reaction.

21. Enzymes 2a. Why do we need enzymes? 2b. Definition of enzyme 2c. How do enzymes work? 2d. Properties of enzymes

22. Enzymes 2a. Why do we need enzymes? 2b. Definition of enzyme 2c. How do enzymes work? 2d. Properties of enzymes

23. Enzyme action Enzymes work by loweringactivation energy

24. Q. What is Activation Energy?

25. Rough representation of Enzyme Action Enzyme-substrate complex Substrates Enzyme + products + Active sites

26. Enzymes 2a. Why do we need enzymes? 2b. Definition of enzyme 2c. How do enzymes work? 2d. Properties of enzymes

27. Enzymes 2a. Why do we need enzymes? 2b. Definition of enzyme 2c. How do enzymes work? 2d. Properties of enzymes

28. Properties of an enzyme Speeds up chemical reaction Required in small amounts Highly specific in action Work best at their optimum temperature and pH May need co-enzymes for activity

29. Properties of an enzyme Speeds up chemical reaction Required in small amounts Highly specific in action Work best at their optimum temperature and pH May need co-enzymes for activity

30. Properties of an enzyme Speeds up chemical reaction Required in small amounts Highly specific in action Work best at their optimum temperature and pH May need co-enzymes for activity

33. Enzymes 2a. Why do we need enzymes? 2b. Definition of enzyme 2c. How do enzymes work? 2d. Properties of enzymes

35. Required in small amounts

36. Highly specific in action

37. Work best at their optimum temperature and pH

39. Q. Are enzymes used in digestion only? What other processes involve enzymes?

40. Homework 3. Read up textbook pg 77-85 to prepare for short quiz next lesson 4. Check out the following websites: http://www.kscience.co.uk/animations/model.swf http://www.dannynicholson.co.uk/enzymetale.swf