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Amylase PH Experiment Aim The aim of this investigation is to find out how different pH levels affect enzyme activity. Introduction Enzymes are globular proteins made up of amino acids strings that are twisted into elaborate shapes. They act as biological catalysts and are soluble. The shape of the enzyme is vital, as the substrate/s must fit exactly into the active site (a cavity) of the enzyme, rather like a lock and key. Once it is inside it forms an enzyme-substrate complex. Enzymes are either catabolic or anabolic. Catabolic enzymes break the substrate down into 2 or more products while an anabolic enzymes bond 2 or more substrates together to form one product. There is also an enzyme induced-fit theory which states that the enzyme changes shape to accommodate the substrates shape and then goes back to its original shape after the reaction is over. Enzymes never get used up so they keep...

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