Enzyme - Globular protein that acts as a biological catalyst in a chemical reaction, Active site - An area on an enzyme molecule where a substrate can bind, Lock and key hypothesis - A type of enzyme action in which the substrate fits exactly into the active site, Induced fit hypothesis - A type of enzyme activity in which either the enzyme or substrate can change shape slightly to ensure a perfect fit with the active site, Tertiary structure - The three dimensional shape of an enzyme that is maintained by intramolecular bonds between the R groups of amino acids in the polypeptide, Activation energy - The energy that needs to be supplied to reactant molecules to make a reaction take place, Enzyme substrate complex - A temporary formation of the substrate binding with the active site, Lysozyme - An enzyme found in tears, saliva and other secretions that is a natural defence against bacteria, Optimum temperature - The temperature at which an enzyme catalyses a reaction at the fastest rate, Denatured - A permanent change in the shape of an enzyme due to the disruption of intra molecular bonds, Intracellular enzyme - An enzyme that works in the cell, Extra cellular enzyme - An enzyme that is secreted by cells and catalyses a reaction outside the cell,

AS Enzymes

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