Dehydration reactions assemble polymers; hydrolysis reactions break polymers apart. Hydrolysis break down molecules and typically release energy, dehydration build up molecules and typically demand energy.
Hydrolysis & dehydration kinds of reactions can assemble and disassemble nucleic acids, proteins, and carbohydrates, however the monomers in each case vary. Because dehydration reactions have a rule for creating polymers from monomers, when they assemble large biological molecules and begin to form more monomers that are connected to one another by covalent bonds until they form a chain of monomers, they must first lose a water molecule before they can begin to synthesise and form a new bond. In a similar vein, when polymers are broken down into monomers by hydrolysis reactions, a water molecule must be added because dehydration reactions also have a rule.
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