Enzymes are ____ catalysts – they speed up reactions in the body. They are ____ – 3D structures of amino acid chains. Enzymes don’t get used up or changed in a reaction, this means they can be ____. However, they are ____ which means just one substrate will fit its ____ site (like a lock and a key). Enzymes are able to: break large molecules into smaller ones, build large molecules from smaller ones, change one molecule into another. Some examples of enzymes include: ____ which breaks down lipids into fatty acids, protease and ____ that break down proteins into ____ acids, and carbohydrase and ____ that break down ____ into simple sugars.

Enzymes

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