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Vocabulary Chapter 2 Chemistry of Life Biology - 2010 Edition Holt McDougal

catalyst

substance that decreases activation energy and increases reaction rate in a chemical reaction

enzyme

protein that catalyzes chemical reactions for organisms

substrate

reactant in a chemical reaction upon which an enzyme acts

chemical reaction

process by which substances change into different substances through the breaking and forming of chemical bonds

activation energy

energy input necessary to initiate a chemical reaction

protein

polymer composed of amino acids linked by peptide bonds; folds into a particular structure depending on bonds between amino acids

hydrogen bond

attraction between a slightly positive hydrogen atom and a slightly negative atom

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