Enzymes and Digestion (Pages 22-23) 0.0 / 5 ? ScienceEnzymes and DigestionGCSEAQA Created by: amelia_loveCreated on: 17-04-15 20:31 What do digestive enzymes do? Break down big molecules into smaller molecules 1 of 19 Name three big molecules involved in the digestive system Starch, proteins and fats 2 of 19 Name four small molecules involved in the digestive system Sugars, amino acids, glycerol and fatty acids 3 of 19 What does amylase do? Convert starch into sugars 4 of 19 Where is amylase used? In the salivary glands, pancreas and the small intestine 5 of 19 What does protease do? Convert proteins into amino acids 6 of 19 Where is protease used? In the pancreas, small intestine and stomach 7 of 19 What is protease in the stomach called? Pepsin 8 of 19 What does Lipase do? Convert lipids into glycerol and fatty acids 9 of 19 Where does lipase work? In the pancreas and small intestine 10 of 19 What enzyme do the salivary glands produce and where? Amylase in the saliva. 11 of 19 Where is bile produced and stored? Bile is produced in the liver and stored in the gall bladder 12 of 19 What does bile do? Neutralise stomach acid and emulsify fats 13 of 19 Is bile an alkaline or an acid? Alkaline 14 of 19 Why is it useful for bile to emulsify fats? It gives a bigger surface area of fat for the enzyme lipase to work on - digestion is quicker 15 of 19 What acid does the stomach produce? Hydrochloric acid 16 of 19 What two reasons does the stomach use hydrochloric acid for? To kill bacteria and to give the right pH for protease to work (pH 2) acidic. 17 of 19 What happens in the large intestine? Excess water is absorbed from the food 18 of 19 What happens in the small intestine? Digested food is absorbed out of the digestive system and into the blood. 19 of 19
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