Which type of reaction is utilized to form polymers from monomers?

• A. Hydrolysis
• B. Dehydration synthesis
• C. Redox reaction
• D. Substitution reaction

Answer: (B)

The formation of polymers from monomers occurs through a process known as dehydration synthesis, also called condensation reaction. In this type of reaction, two monomer molecules are joined together, releasing a molecule of water in the process. This occurs because a hydroxyl group (-OH) is removed from one monomer and a hydrogen atom (H) is removed from the second monomer, combining them to form a covalent bond and producing water as a byproduct.

This mechanism is fundamental in the creation of various biological macromolecules, such as proteins (from amino acids), carbohydrates (from simple sugars), and nucleic acids (from nucleotides). By linking monomers through dehydration synthesis, long chains or complex structures are formed, which are essential for the functional diversity of biological systems.

In contrast, hydrolysis would involve the breaking down of a polymer into monomers by adding a water molecule, while redox reactions involve the transfer of electrons between molecules, and substitution reactions pertain to the replacement of one atom or group in a molecule with another. Thus, the unique characteristics and processes involved in dehydration synthesis specifically enable the formation of polymers from their constituent monomers.