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Investigating the Effect of Temperature on Catalase Enzyme Efficiency on the Breaking down of Hydrogen Peroxide Introduction Enzymes are biological catalysts made up of proteins, which break down and simplify chemical molecules. They reduce the activation temperatures of reactions and therefore make them possible within living cells. These chemical molecules are called substrates. The "Lock and Key" theory states that every enzyme has an active site on the surface, which the particular substrate fits and stays due to electrical attractions, it is then changed to different substances with different electrical combinations and so is left. Lock and Key Theory This however cannot be correct, as enzyme activity is not controlled by concentration alone, but by pH, temperature and substances other than the substrate can lock onto the active site, for example carbon monoxide onto haemoglobin in the blood. This is called a competitive inhibitor; non-competitive inhibitors fix themselves onto another part of the...

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