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The Effect of Temperature on Catalase Enzymes

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Nicole Ryan The Effect of Temperature on Catalase Enzymes Introduction Enzymes are biological catalysts that speed up chemical reactions, which go on inside all living things. Without these enzymes the reactions would be so slow that life would come to a halt! The key factors that affect the way the enzymes work is: * Temperature The higher the temperature the better the enzymes work, although if the temperature is raised above 45 the enzyme will become denatured (Destroyed). * Ph factor some enzymes work only in a certain ph for example the digestive enzymes work in very acidic conditions whereas the enzymes in the small intestine work best in alkaline conditions. The factors that I am going to keep the same are the Ph factor, the amount of hydrogen peroxide and the amount of Catalase. I will keep these the same because the results will be inaccurate if they are not kept a steady amount or Ph. I am going to test the effectiveness of the enzyme by changing the factor temperature. ...read more.


The only thing I will change in my experiment is that I will heat the Hydrogen Peroxide to the chosen temp before putting the catalase source in Pre-test Evaluation I used 60( for one of my temperatures and instead of the enzyme denaturing (like the scientific terms show it should) at 60( was when the most gas was collected. Enzymes are supposed to denature after 45(. This was because I didn't let the Hydrogen Peroxide rise to the temperature of the water before dropping the potato Prediction For my actual experiment I predict that the more I raise the temp the more gas will be collected because enzyme activity is increased when the temperature increases. Raising the temperature will increase the random movements of the molecules and increase the chance of the substrate (Hydrogen Peroxide) and enzyme colliding. I must remember that although increasing the temperature increases enzyme activity a great increase of temperature, which cause the enzyme to denature. The special shape of the enzyme changes and the substrate will no longer fit in the active site. ...read more.


The of gas rose because the heat activated more energy in the enzyme which was breaking down the hydrogen peroxide to a gas so as the enzymes gained more energy the more they moved so the more they moved at collided with the hydrogen peroxide molecules (which the reaction to take place). Then at 50(C the results started to fall proving that the enzyme became destroyed by so much heat and couldn't react as much, because their shape had been disfigured. Evaluation My experiment went to plan and the amounts of substances and the temperature ranges that I chose to use worked extremely well. There were no anomalous results on my graph. If I were to improve my experiment I would grate the potato into hydrogen peroxide instead of using a solid piece of potato this is because using a solid piece means that the catalase in the middle of the chunk is not being used because the hydrogen peroxide is only on the outside. The reaction will only take place on the surface but grating it using a pestle would mean using all of the catalase in the potato and a much speedier investigation. ?? ?? ?? ?? ...read more.

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