Biological Molecules
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Diet and exercise
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IGCSE Biological molecules.
Biologymann
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IGCSE Teeth
Biologymann
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Digestive system
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Games on digestion: |
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PowerPoint download |
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Enzymes are proteins. They act as catalysts, allowing chemical reactions to take place by lowering the amount of energy needed. They therefore speed up reactions or allow them to happen at low temperatures. Some enzymes break down substances (e.g. digestive enzymes). |
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Some enzymes build up simple raw materials into more complex substances. These are enzyme controlled anabolic reactions |
Enzymes are very specific. The lock and key hypothesis explains this using the idea that each enzyme has a specifically shaped active site. |
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The lock and key hypothesis explains why high temperatures denature enzymes. |
Results
Tubes A and B both remain cloudy as neither hydrochloric acid or pepsin will digest protein on their own. The contents in tube C go clear as the pepsin will digest the protein at a low pH. Boiled pepsin is denatured, so tube D remains cloudy.
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Properties of enzymes and use in industries
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Digestion
Biologymann
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