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Investigating the effect of the enzyme catalase on Hydrogen Peroxide Prediction I think that as you add more potato to the hydrogen peroxide the reaction will be larger until all the hydrogen peroxide is used up and can no longer react. Scientific knowledge The substance on which an enzyme acts is called the substrate of that enzyme. The reaction takes place when the substrate molecule and enzyme molecule join together. Each enzyme can only catalyse one reaction. The lock and key theory is a good way to explain how enzymes work. For example if you put a key in a lock that isn't made for that key it won't fit properly. This works with enzymes the active site and the substrate bind together and a reaction takes place. Although if the substrate isn't the exact same shape then they won't bind together. This is to ensure that the enzyme doesn't take...

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