Which macromolecule group provides structural carbohydrates in plant cell walls?

• A. Lipids
• B. Proteins
• C. Nucleic Acids
• D. Carbohydrates

Answer: (D)

Plant cell walls get their rigidity from carbohydrate polymers, with cellulose being the main structural component. cellulose forms long chains of glucose linked by beta-1,4 bonds that bundle into strong microfibrils, creating a robust network that supports the cell and resists swelling. Lipids mainly make up membranes and store energy, not the wall’s scaffold. Nucleic acids store genetic information and don’t contribute to wall structure. Proteins do have roles in wall synthesis and some structural contributions, but the primary framework comes from carbohydrates. So the group responsible for the structural carbohydrates in plant cell walls is carbohydrates.