Biology B2: Enzymes 0.0 / 5 ? BiologyEnzymes and digestionGCSEAQA Created by: HarrisonG23Created on: 14-04-19 12:38 What is a catalyst? A catalyst is a substance which increases the speed of a reaction without being changed or used up 1 of 13 What are enzymes? They are biological catalysts 2 of 13 Why can enzymes generally only speed up one specific reaction? The substrate has to fit into the enzymes active sight 3 of 13 What happens when a substrate meets the active site? The active site changes shape slightly to get a tighter fit 4 of 13 What affects the rate of an enzymes rate of reaction? Temperature, it makes the rate of reaction of faster. pH also affects it 5 of 13 What happens to an enzyme if it gets too hot? The active sight changes shape and the enzyme becomes denatured 6 of 13 What happens to an enzyme if the pH is too high/low? The active sight changes shape and the enzyme becomes denatured 7 of 13 What do digestive enzymes break down? Starch, Proteins and Fats 8 of 13 Why do digestive enzymes have to break down big molecules? Because they cannot pass through the walls of the digestive system 9 of 13 What does amylase do? Breaks starch down into maltose 10 of 13 What does protease do? Breaks down proteins into amino acids 11 of 13 What does Lipase do? Breaks down lipids into fatty acids 12 of 13 How does bile assist digestive enzymes? Bile neutralises the pH in the small intestines because it is too acidic 13 of 13
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