Presentation on theme: "Protein and Enzymes b. What are enzymes and where are they found?"— Presentation transcript:
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 As a class organise yourself in a line from what you decide to be card one to the final card No teacher input here
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
What are enzymes? Enzymes are molecules which speed up chemical reactions. Things which speed up chemical reactions are called catalysts. Without catalyst With catalyst
What are enzymes? Cont’d Enzymes are biological catalysts. Enzymes are made of protein There are many different types of enzyme. Different enzymes have different jobs. Catalase is an example of an enzyme
Demo: Action of Catalase When the enzyme catalase is added to hydrogen peroxide, bubbles are produced. catalase hydrogen peroxide
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
Experiment 1 Aim: to find out what types of cells catalase is active in Liver in 10ml of H 2 O 2 + 2 drops of detergent Potato in 10ml of H 2 O 2 + 2 drops of detergent Peas in 10ml of H 2 O 2 + 2 drops of detergent Boiled peas in 10ml of H 2 O 2 + 2 drops of detergent
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: PlantsAnimals
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
Action of Catalase Catalase ‘catalyses’ the breakdown of hydrogen peroxide. This means that catalase makes the reaction happen faster. hydrogen peroxide wateroxygen catalase
Where is Catalase found? Catalase can be found in living tissues For example: liver potato apple carrot
Summary Find the fib Enzymes slow down reactions Enzymes speed up reactions Enzymes have no effect on reactions
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!!