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Name: _________________________ Enzymes Worksheet Enzymes Most reactions take place in a number of __________ which need to be _________________________ if the cell is to function properly ______________ are the most important controllers of cellular reactions Catalysts _______________ speed up reactions without themselves being involved in the reaction. ______________ are catalysts made of ____________ they speed up a reaction without being used up themselves in the reaction. Because enzymes are made in living things they are called ____________________ (or organic catalysts) Proteins are made when ____________________ join together. The function of a protein is decided not only by the _______________ of amino acids but also by the way the protein __________. Most enzymes are ________________ proteins How enzymes work Enzymes are not flat they have a 3D structure Each enzyme has its own __________________________ that will only “fit” the molecule that the enzyme is designed to work on. If the enzyme that breaks down starch into glucose meets a fat molecule it _______________________ and will not be able to work on it. Enzyme Action The substance that an enzyme acts on is its __________________ The substance(s) that the enzyme forms is called the ________________ A Catabolic enzyme Amylase converts ____________ to ______________. Catabolic as it breaks a __________ molecule into a __________ one. It is produced by ___________________ in mouth and by the ______________. Page 1 of 2 Name: _________________________ An Anabolic Enzyme ______________________________ forms and repairs DNA. Anabolic as it coverts __________ molecules into more __________ molecules. Found in almost all living things Consider This … Amylase is an enzyme found in saliva. It breaks starch molecules into smaller maltose molecules. What is the substrate? _______________________________________________ What is the product? ________________________________________________ Will amylase break fats into fatty acids + glycerol? ______ Why? ____________________________________________________________________________ Is this an example of a catabolic or an anabolic reaction? ___________________________ Why? ___________________________________________________________________________ … And This. DNA Polymerase is an enzyme that builds DNA using tiny molecules in our cells. What is the substrate? _______________________________________________________ What is the product? ________________________________________________________ Will amylase build keratin out of peptides? __________ Why? _____________________________________________________________________________ Is this an example of a catabolic or an anabolic reaction? ________________________ Why? ___________________________________________________________________________ Enzymes work because they have the correct shape to fit the substrate. They have a ______________________________________________ shape to fit the substrate. When enzymes and their substrates meet and come together they form an _________________________________ complex. Page 2 of 2
