How Do Enzymes Work?

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Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for a reaction to take place. Learn about the induced fit model, and how it's related to enzymes with help from a science teacher and field biologist in this free video on biology.

Part of the Video Series: Chemistry & Biology
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Video Transcript

Hi I'm Brian with Today we're going to discuss how enzymes work. Enzymes are biological catalysts which means that they speed up chemical reactions. And the way that they do this is by lowering the activation energy which is how much energy is required for a reaction to take place. Basically what happens the theory behind it is called the induced fit model. You have your enzyme and you have a substrate which is the particle that the enzyme is going to act upon. The substrate comes in and your enzyme then changes shape, that changing of shape puts the substrate or the reactant into a more favorable position, it then reacts because the energy needed is lower. Once the reaction occurs, the enzyme releases it, goes back to it's original form and is ready to do it all over again. Catalysts don't change as a result of the reaction and so they're able to catalyze over and over again. This has been a discussion of how enzymes work.


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