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Introduction: Enzymes help to turn a substrate into the product. The enzyme has an active site that helps it to recognise its substrate in a very specific way. Just like a key only fits into a specific lock, each enzyme has its own specific substrate. This is called the lock and key theory. In this experiment I am trying to find the best conditions for amylase to digest starch. I am going to vary the PH from PH6 to PH9 to see which one helps digestion the fastest. This will show which PH enzymes will work best in. I will put 3cm³ of 1% amylase solution, 1cm³ of 0.5% starch solution and 1cm³ of the different acid or alkali I am testing to each test tube. I will then heat them in a water bath to 40º. I will then every 2 minutes test the solution for starch using iodine solution. I already...

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