Action of Enzymes

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Enzymes are proteins that speed up the rate of chemical reactions. 

Enzymes as biological catalysts

Enzymes speed up chemical reactions by acting as biological catalysts. 

A catalyst speeds up a chemical reaction without being used up in the reaction itself. 

Enzymes catalyse metabolic reactions such as digestion and respiration. Enzyme action can be intracellular or extracellular. 

Enzyme Structure

Enzymes are globular proteins. They have an active site, which has a specific shape determined by the enzymes tertiary structure. The active site is the part where the substrate binds to. 

For the enzyme to work, the substrate has to fit into the active site. If the substrate doesn't match the reaction won't be catalysed. This


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