Enzymes. Enzymes are organic catalysts A catalyst speeds up the rate of a reaction An enzyme will speed up a reaction by lower the activation energy of the reaction. This is the energy required for a chemical reaction to start .
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In a solution, the enzymes will catalyze substrates continuously until all substrates are reacted. However, an enzyme can only react with one substrate at a time. If a solution has more substrate in it than a certain amount of enzyme can react to quickly, it is called a saturated solution.