Explain why enzymes are described as biological catalysts and how they function?

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A catalyst is a chemical that increases the rate of reaction without being used up. They do this by providing an alternate reaction pathway which requires less energy to start the reaction. Enzymes perform this role in the body.

Enzymes are folded proteins. They contain an active site where the desired molecule, the substrate, can enter and bind to, allowing the reaction to proceed. Every enzyme has a specific active site shape which is complementary to the shape of a specific substrate.

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