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.
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?
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 + 6H2OC6H12O6 + 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
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
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33. Enzymes 2a. Why do we need enzymes? 2b. Definition of enzyme 2c. How do enzymes work? 2d. Properties of enzymes
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