Enzymes speed up the reaction of the substrate by lowering the activation energy.
Substrates are the substances on which an enzyme act. In enzymes, the substrate interacts with the side chain of amino acids which leads to the formation or breaking of bonds. The interaction of a substrate molecule with an enzyme must occur before it is transformed into a product. The place of interaction between an enzyme and a substrate is known as an active site.
After the formation of the product, the enzymes remains intact which means they get back to there original form.
Therefore, enzymes speed up the reaction and remain the same after the formation of product.
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