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Transcript of Enzymes
OF THE OOZING
PUMPKIN! 2 H2O2 -> 2 H2O(l) + O2(g) Potassium Iodide which acted as a
catalyst for the reaction CATALYST A substance which speeds up a chemical reaction, but itself remains unchanged at the end of the reaction. Catalysts speed up a chemical reaction by lowering the activation energy barrier required to start a reaction. can be defined as biological catalysts made of protein. Enzymes are highly specific in their action due to their precise three-dimensional conformation. Active Site Substrate Enzyme Substrate Complementary binding of substrate molecule at the active site of the enzyme. Formation of enzyme-substrate complex Chemical reactions convert the substrate molecule into product molecules. Separation of product molecules from the active site of enzyme Free, unchanged enzyme Product molecules ACTION OF ENZYME Effect of temperature on enzyme activity At low temperatures, enzymes are inactivated Enzyme activity is low. As temperature increases, its activity increases. There is an increase in kinetic energy of enzyme and substrate molecules.
As they move about more rapidly, the frequency of effective collisions between substrate molecules and enzyme's active site increases. The rate of enzyme-substrate complex formation increases, thus leading to an increase in the rate of reaction. Enzyme-substrate complex Optimum temperature is the temperature at which the rate of reaction occurs fastest or at which enzyme activity is the greatest. High temperature disrupts the interactions that stabilise the three-dimensional conformation of the enzyme molecule. There is a loss in the specific shape of the active site.
The active site is distorted and is no longer complementary to the substrate. No enzyme-substrate complex is formed. The enzyme has denatured. Why is milk white? Milk contains Casein, a milk protein that is rich in calcium and gives milk its white colour. Trypsin is an enzyme that catalyses breakdown/ hydrolysis of the protein in milk to short polypeptides. What is Trypsin? How to determine rate of reaction/ level of enzymatic activity? In a chemical reaction, substrate/ reactant molecules are converted to product molecules. To measure the rate: 1. Amount of reactant lost/ Total Time
2. Amount of product formed/ Total Time - 10 molecules of reactant collide with 10kJ of energy
- 5 molecules of reactant collide with 5kJ of energy Ea of uncatalysed reaction: 10kJ
Ea of catalysed reaction: 5kJ