Activation Energy and Enzymes

Activation Energy and Enzymes - there is not much...

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Activation Energy and Enzymes The amount of activation energy that is required is considerably less when enzyme is present. Conditions that Affect Enzymatic Reactions Rate of Reaction Reactions with enzymes are up to 10 billion times faster than those without enzymes. Enzymes typically react with between 1 and 10,000 molecules per second. Fast enzymes catalyze up to 500,000 molecules per second. Substrate concentration, enzyme concentration, Temperature, and pH affect the rate of enzyme reactions. Substrate Concentration At lower concentrations, the active sites on most of the enzyme molecules are not filled because
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Unformatted text preview: there is not much substrate. Higher concentrations cause more collisions between the molecules. With more molecules and collisions, enzymes are more likely to encounter molecules of reactant. The maximum velocity of a reaction is reached when the active sites are almost continuously filled. Increased substrate concentration after this point will not increase the rate. Reaction rate therefore increases as substrate concentration is increased but it levels off....
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