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In Chemistry, hydrolysis is the addition of one or more water molecules to another molecule, usually to create two different compounds. The opposite of hydrolysis (the removal of one water molecule usually from two different compounds to form one single compound) is known as condensation. In Biology, hydrolysis (and condensation) have the same meaning as in Chemistry. Hydrolysis is usually and most commonly (at least as far as my knowledge concerns) used for the breakdown of ester links in lipids, glycosidic bonds in polysaccharides and peptide bonds in polypeptide molecules. Condensation reactions occur for the opposite outcome.

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