What is an enzyme? Why is it important?


What is an enzyme? Why is it important?


Proteins are a large class of macromolecules consisting of polypeptide chains made up of amino acids. There are 20 different amino acids, and different combinations of these amino acids account for the wide variability in protein structure and function that can be seen throughout the human body and other organisms. The primary structure of polypeptide chains bond, coil, and join together with other chains to form secondary, tertiary, and quaternary protein structures which allow for protein functionality.

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An enzyme is a protein that functions as a catalyst during a chemical reaction to speed up the rate of that reaction. Enzymes work by lowering the...

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Enzyme Rate of Reaction: Factors & Catalysts


Chapter 3 / Lesson 2

Learn how an enzyme influences biological reactions. Read about rate-limiting enzymes and how factors such as pH and substrate concentration affect enzyme activity.

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