Catalyst - A substance that speeds up a reaction, Activation Energy - The minimum energy particles need for collisions to happen, Enzymes - Biological catalysts , Substrate - A substance that fits into the active site of an enzyme , Active site - An area of an enzyme that is a specific shape, this is where the substrate attaches, 37C - This is the optimum temperature for enzymes in the body to work at as it is body temperature , Optimum - The situation that shows the best outcome ,

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