UNIT 5 Enzymes, metabolism and digestion
Essential ideas:
- Enzymes control the metabolism of the cell.
- Metabolic reactions are regulated in response to the cell’s needs.
- The structure of the wall of the small intestine allows it to move, digest and absorb food.
- How are the organs of the digestive system connected together?
- Which muscles are responsible for 'peristalsis' - the movement of food along the digestive system?
- How many types of nutrient were covered in topic 2.
- For each type of nutrient, name the digestive enzyme which breaks it down, and name the products of digestion.
- How does the body increase the rate of absorption of the products of digestion?
- Which membrane transport mechanisms from topic 1 might be used in absorption?
- A chain or a cycle of enzyme-catalysed reactions makes a metabolic pathway.
- Enzymes catalyse chemical reactions by lowering the activation energy.
- Competitive inhibitors for example in medicine - ethanol and Fomepizole used as competitive inhibitors for antifreeze poisoning.
- Non-competitive inhibitors. E.g. Drugs for treatment of malaria.
- End-product inhibition can control metabolic pathways - e.g. In the pathway that converts threonine to isoleucine.
Nature of science
- Use models as representations of the real world—dialysis tubing can be used to model absorption in the intestine.
Content |
Core Resources |
Support Material |
Introduction to enzymes Workbook 50 |
Watch this animation: How enzymes work Recap MYP enzymes using the following ppt: 1. Enzymes Now complete this worksheet on the lock and key hypothesis: 2. Lock and key hypothesis |
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Enzymes control the metabolism of the cell Workbook 223 |
3. Enzyme details ppt Complete the notes worksheet as we work through ppt and animations 4. Enzyme notes worksheet |
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Factors affecting enzyme activity Workbook 51 |
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Industrial uses of enzymes Workbook 53 |
Here we will look at immobilised enzymes, lactose free milk and other industrial uses for enzymes. 6. Industrial uses of enzymes Use the following worksheet whilst watching the following videos: 7. Video prompting questions
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Practical investigations into enzyme activity Workbook 52 |
9. Lab - Catalase introduction Compile class data and process and analyse the data to draw conclusions and complete evaluation of your own experiment. |
Weblink |
Introduction to digestion Workbook 160-164 |
10. Lab Digestion why enzymes? Use the Kognity section 6.1.6 and complete the 2 exercises to complete the section. Complete labeled diagram of digestive system for note to annotate as we study the system: 11. Digestion ppt HOMEWORK - Learn the structure and function of the digestive system and practice using QUIZLET |
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Structure of the wall Workbook 165 |
Use the ppt to fill in the worksheet: 12. Structure and absorption ppt 13. Absorption of digested food worksheet |
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Metabolism and how enzymes involved |
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Enzyme inhibition |
Value |
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End product inhibition |
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Link between digestion and enzymes |
Play the game to make the connections 14. Enzyme loop game Use the enzymes review to help you 15. (2.5) Enzyme review Kognity section 2.5 (complete the sections, checkpoint questions, assignment) |
Use the Quizlets to review |
Nearly there |
Use your notes, textbook and workbook to complete the review notes to prepare for the topic test 16. (6.1) Digestion and absorption 17. Review notes to complete 18. Draw and label digestive system practice Workbook 167 |
TEST NEXT LESSON |