This continues until the molecule has been broken down completely
There are 3 main types of digestive enzymes:
Amylase breaks starch down into glucose.
Protease breaks protein down into amino acids.
Lipase breaks fats down into fatty acids and glycerol
What factors affect the rate of reaction of enzymes
How do you think you can speed up the rate of an enzymic reaction? (Hint: Itís the same as any other reaction!)
Amylase enzyme breaks down starch into glucose.
Iodine is the test for starch. If starch is present, iodine turns blue/black.
Watch the demonstration of the experiment then answer the questions on your sheet.
Starch and Iodine
Water at 37˚C
Stopwatch, syringe x 2, thermometer,
Heat the water in the water bath to 37˚C.
Measure out 1cm3 of Starch solution and put it into a test tube.
Put 5 drops of Iodine into the starch. It should turn blue/black.
Put the test tube into the water bath for 2 minutes.
Put 5 drops of Amylase into the starch and start the stopwatch. Stop timing when the blue/black colour disappears.
It took _ seconds for the Iodine and starch solution to turn colourless.
When the starch has been digested into glucose by the amylase the blue/black colour disappears. It took _ seconds for the amylase to digest the starch.
Design an experiment to investigate how to speed up the digestion of starch by amylase.
Use the basic method in your worksheets but add detail to it.
Carry out your investigation safely!