Biology- Enzymes 1.0 / 5 based on 1 rating ? BiologyEnzymes and digestionIGCSECIE Created by: KitsuneCreated on: 07-07-16 10:22 What reactions build up molecules? Anabolic molecules 1 of 16 What reactions break down molecules? Catabolic reactions 2 of 16 What is a catalyst? A substance that speeds up the reaction but doesn't change the product and remains unchanged itself 3 of 16 What are enzymes? Proteins, that act as biological catalysts 4 of 16 What does the enzyme work on? The substrate 5 of 16 Where does the substrate fit in? The active site 6 of 16 Can enzymes work on different substrates? No, they are specific 7 of 16 Give examples of intracellular enzymes Catalase (breaks H2O2), phosphorylase (builds glucose into starch) 8 of 16 Give examples of extracellular enzymes Lipase (breaks fats), amylase (breaks starch into maltose) 9 of 16 What are the two factors that affect enzymes? Temperature and pH 10 of 16 How does temperature affect enzyme activity? Higher temperature speeds up the movement of substrates and enzymes so they are more likely to collide 11 of 16 How can enzymes become denatured by temperature? They vibrate so much as they take in energy that their active site becomes deformed 12 of 16 How does pH affect enzymes? Changing pH may result in denaturation 13 of 16 What makes the binding of a substate and enzyme more likely? Activators 14 of 16 What makes the binding of a substate and enzyme less likely? Inhibitors 15 of 16 Why are enzymes os useful? They can be reused and they are specific 16 of 16
Comments
No comments have yet been made