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National Biology

Today, we explore enzymes, the biological catalysts that accelerate chemical reactions within living organisms. Found in both plant and animal cells, enzymes play a vital role in various biochemical processes. We'll learn how enzymes like catalase function, demonstrated by observing the breakdown of hydrogen peroxide into water and oxygen, producing visible bubbles. You will work collaboratively to understand where enzymes are found, how they speed up reactions, and the importance of catalysts in biology. Join us in uncovering the fascinating world of enzymes!

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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 found only in animal cells • Enzymes are found only in plant cells • Enzymes are found in both plant and animal cells • Now make up some of your own!!

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