Activation Energy, energy needed to start a chemical reaction, Catalyst, substances that speed up a chemical reaction, without itself being chemically changed at the end of the reaction, chemically unchanged, why enzymes are required in minute amounts, active sites, Enzyme reactions depend on the presence of _________ _________, substrates, substances that enzymes act on, lock, enzyme acts as a, enzyme-substrate complex, when substrate binds to active site of enzyme, this is formed, complementary, specific substate with 3D shape _________ to active site of enzyme can fit, temperature, enzymes are affected by

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