Enzymes are catalyses that speed up chemical reactions in your body they are proteins large molecules that are made up of long chains of amino acids. The amino acid chains are different in each protein so each protein has its different shape.
Enzyes break up large molecules and join some smaller molecules together.The molecules must be able to fit into the enzyme whcih is it's active site its kind of like a key fitting into the right lock.
So scientists call the explanation of how enzymes work by the lock and key model.We need enymes to speed up chemical reactions in our body because if we didnt have enyzes the reactions wouldnt happen quick enough so we need ezymes to survive.
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