Condensation Reaction: This is the primary method for building polymers. When two monomers join, a covalent bond forms and a single molecule of water () is removed.
Hydrolysis Reaction: This is the process of breaking down polymers into monomers. It requires the addition of a water molecule to break the covalent bond linking the subunits.
Enzymatic Control: In living systems, these reactions do not occur spontaneously at a sufficient rate; they are catalyzed by specific enzymes that lower the activation energy required for the bond to form or break.
Identify the Water: When asked to identify a reaction type, look at the movement of water. If water is a product, it is condensation; if water is a reactant, it is hydrolysis.
Bond Recognition: Be prepared to identify specific covalent bonds by name based on the molecule. For example, always associate 'glycosidic' with carbohydrates and 'peptide' with proteins.
Count the Water: For a polymer of monomers, water molecules are removed during synthesis and water molecules are required for complete hydrolysis.
Lipids as Polymers: A very common mistake is classifying lipids as polymers. Remember that polymers must have repeating subunits; since a triglyceride is a finite structure of one glycerol and three fatty acids, it does not fit the definition.
Bond vs. Reaction: Students often confuse the name of the bond (e.g., peptide bond) with the name of the reaction (condensation). The reaction is the process, while the bond is the result.
Water in Hydrolysis: Many assume hydrolysis 'produces' water because it breaks things down, but it actually 'consumes' water to satisfy the chemical valency of the separated monomers.
