Biology-B2-Enzymes 0.0 / 5 ? BiologyEnzymes and digestionGCSEAQA Created by: tonisha_Created on: 07-05-22 17:33 What do enzymes do to reactions? What is the definition of a catalyst? 1-speed them up (catalayse) 2- a catalyst is a substance that speeds up the rate of reaction without being used up in the process 1 of 48 What are the two parts of an enzyme the active site and the substrate 2 of 48 Enzymes are what? specific 3 of 48 This means that the substrate must do what? fit perfectly into the active site 4 of 48 This is known as the what theory? lock and key theory 5 of 48 What are the three digestive enzymes? amylase (carbohydrase) protease lipase 6 of 48 Proteins are broken down by? protease 7 of 48 What three places of the body are protease found in? stomach pancreas small intestine 8 of 48 Proteins are long____? chains 9 of 48 Of? amino acids 10 of 48 When we digest protein, the protease enzyme does converts the _____ back into individual ____ _____? converts the proteins back into individual amino acids 11 of 48 These are then absorbed into? bloodstream 12 of 48 Those amino acids are then absorbed into what? the body cells 13 of 48 And are joined together in a _______ order? different order 14 of 48 to make? human proteins 15 of 48 Starch is a chain of _______ molecules? glucose molecules 16 of 48 Carbohydrates are broken down by what enzyme? carbohydrases 17 of 48 In this case, starch is broken down by what enzyme? the enzyme amylase 18 of 48 When carbohydrates like e.g.? starch 19 of 48 are digested we produce what? simple sugars 20 of 48 Carbohydrases are found where? (2) saliva pancreatic fluids 21 of 48 A lipid molecule consists of a molecule of g_______? glycerol 22 of 48 attached to 3 molecules of what ______ acids? fatty acid 23 of 48 Lipids are broken down by the enzyme what? lipase 24 of 48 These are found where (2)? pancreatic fluid small intestine 25 of 48 Where is bile made? in the liver 26 of 48 Where is it stored? gall bladder 27 of 48 Bile helps speed up? digestion 28 of 48 But is not a what ? an enzyme 29 of 48 Bile breaks down a large lipid into? smaller lipids 30 of 48 Bile_______lipid? emulsifies 31 of 48 This increases the what of the lipid? surface area 32 of 48 Of the ? lipid 33 of 48 Bile is also what? alkaline 34 of 48 This allows it to do what to stomach acid? neutralise it 35 of 48 This creates alkaline conditions in the? the small intestine 36 of 48 This also increases the rate of? digestion 37 of 48 As we increase the temperature, the activity of the enzyme will? also increase 38 of 48 At a certain point the enzyme will reach its what? optimum temperature 39 of 48 This is where the enzyme is working at the _____ possible rate? fastest 40 of 48 However if we continue to increase the temp what will happen to the activity of the enzyme? it will decrease 41 of 48 This is because the active site will have ______ shape? changed 42 of 48 This means that the enzyme has? denatured 43 of 48 Enzymes also have an optimum? pH 44 of 48 If the pH of the enzyme is too ____ or ____ it will also _____? too acidic or alkaline it will also denature 45 of 48 For example what is the enzyme that digests proteins in the stomach? pepsin 46 of 48 What is the pH level that pepsin usually works at? pH 2 47 of 48 If any high or lower it will? denature 48 of 48
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