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I know that enzymes are proteins which must fold up in a certain way to work and that when the temperature is elevated they start breaking up. That is the reason why our bodies must stay at around 37.5 degrees Celsius. But I was wondering what do enzymes do in the body?

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As you already know enzymes are made as long, linear chains of amino acids that fold to produce a 3D product and each unique amino acid sequence produces a unique structure, which has unique properties. Most enzymes are much larger than the substrates they act on. A very small portion of the enzyme is directly involved in catalysis and the region that contains these catalytic residues, binds the substrate and then carries out the reaction is known as the active site. Enzymes can also contain sites that bind cofactors, which are needed for catalysis, also some of them have binding sites for small molecules, which are often direct or indirect products or substrates of the reaction catalyzed.
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