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National Biology

National Biology. Protein and Enzymes b. What are enzymes and where are they found?. Recap. You have been issued a card. Read the card and think about what it says in relation to what we have done so far on DNA, mRNA, protein synthesis and protein structures

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National Biology

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  1. National Biology Protein and Enzymes b. What are enzymes and where are they found?

  2. Recap • You have been issued a card. • Read the card and think about what it says in relation to what we have done so far on DNA, mRNA, protein synthesis and protein structures • As a class organise yourself in a line from what you decide to be card one to the final card • No teacher input here

  3. What are we learning today? We are learning to: • State where enzymes are found. • Explain that enzymes are biological catalysts and change the rate of biochemical reactions. Success criteria: • Enzymes found in plant and animal cells • Enzymes lower the energy required for a biochemical reaction to take place

  4. What are enzymes? • Enzymes are molecules which speed up chemical reactions. • Things which speed up chemical reactions are called catalysts. Without catalyst With catalyst

  5. What are enzymes? Cont’d • Enzymes are biologicalcatalysts. • Enzymes are made of protein • There are many different types of enzyme. • Different enzymes have different jobs. • Catalase is an example of an enzyme

  6. Demo: Action of Catalase • When the enzyme catalase is added to hydrogen peroxide, bubbles are produced. catalase hydrogen peroxide

  7. Result of Action of Catalase • When we test the bubbles produced with a glowing splint it relights: This tells us that the gas released is oxygen

  8. Experiment 1 • Aim: to find out what types of cells catalase is active in Boiled peas in 10ml of H2O2 + 2 drops of detergent Peas in 10ml of H2O2 + 2 drops of detergent Liver in 10ml of H2O2 + 2 drops of detergent Potato in 10ml of H2O2 + 2 drops of detergent

  9. Experiment 1 Conclusion • Catalase is active in living cells • The tube containing the boiled peas proved this because no reaction occurred • Enzymes are biological catalysts • This means they are made in all living cells: Plants Animals

  10. Action of Catalase • Catalase is an enzyme that works on a substance called hydrogen peroxide. • Hydrogen peroxide is made in all living cells and must be broken down to make it safe. hydrogen peroxide

  11. water oxygen catalase Action of Catalase • Catalase ‘catalyses’ the breakdown of hydrogen peroxide. • This means that catalase makes the reaction happen faster. hydrogen peroxide

  12. Where is Catalase found? • Catalase can be found in living tissues • For example: apple potato carrot liver

  13. Summary Find the fib • Enzymes slow down reactions • Enzymes speed up reactions • Enzymes have no effect on reactions

  14. Summary Find the fib • Enzymes are made by animals • Enzymes are made by plants • Enzymes are made by neither plants or animals • Now make up some of your own!!

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