Macromolecules unique to animal cells

Steps:

• Identify macromolecules as large biomolecules: carbohydrates (e.g., polysaccharides), proteins, nucleic acids, lipids.
• Recall animal cells store energy as glycogen (polysaccharide) and use collagen (protein) for structural support in connective tissues.
• Eliminate pairs with plant-specific or non-macromolecular components.
• Verify pair B contains only animal-exclusive macromolecules.

Why B is correct:

• Collagen is a fibrous protein defining animal extracellular matrix; glycogen is the branched polysaccharide for glycogen storage disease in animals, per biochemical definitions.

Why the others are wrong:

• A: Amylopectin is a plant starch component, absent in animals.
• C: Deoxyribose is a monosaccharide (not a macromolecule); starch is plant-specific.
• D: Sucrose is a disaccharide (not a macromolecule).

Final answer: B