Enzymes 0.0 / 5 ? BiologyEnzymes and digestionGCSEAQA Created by: Burney7Created on: 14-08-20 16:15 What are enzymes? Enzymes are large protein molecules. They have a groove on their surface called the active site. Enzymes speed up (catalyse) chemical reactions. 1 of 7 What is an active site and what is a substrate? The active site is where the substrate attaches to. The substrate is substance broken down into the products by the enzyme. 2 of 7 What is the lock and key theory? Enzymes are specific to the substrate. The substrate must fit perfectly into the active site. 3 of 7 What are proteins made of and what enzymes break down proteins? Proteins are long strands of amino acids and they are broken down by proteases . 4 of 7 What is starch made of and what enzyme breaks down starch? Starch consists of a chain of glucose molecules, and they broken down by amylase enzymes. 5 of 7 What are lipids made of and and what enzymes break down lipids? Lipid molecules consist of glycerol and fatty acids and are digested by lipase. 6 of 7 What is bile? Bile is an alkaline made in the liver and stored in the gall bladder. Bile helps speed up the digestion of lipids, and neutralises the stomach acid. 7 of 7
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