Final answer:
In dehydration synthesis, monomers bond to form polymers and release water. The hydrogen of one monomer and the hydroxyl group of another contribute to water formation as they form a covalent bond.
Step-by-step explanation:
Dehydration synthesis is a chemical reaction in which monomers bind together to form polymers with the release of water as a byproduct. In this process, the hydrogen of one monomer combines with the hydroxyl group of another monomer, leading to the release of a water molecule. Simultaneously, the monomers share electrons to form covalent bonds. This process can be seen across various forms of macromolecules such as carbohydrates, proteins, and nucleic acids, and is essential for the formation of complex biological molecules.