Classifying biomolecules as polymers

Steps:

• Define key terms: Polymers are large molecules formed by linking monomers; polysaccharides are carbohydrate polymers.
• Evaluate A: Cellulose, glycogen, and amylopectin are all polysaccharides made of glucose monomers.
• Check B, C, D: Identify mismatches in macromolecule, monomer, or polysaccharide categories.
• Confirm A as the only fully accurate statement.

Why A is correct:

• Cellulose, glycogen, and amylopectin are polysaccharides, defined as polymers of glucose units linked by glycosidic bonds.

Why the others are wrong:

• B: Ribose and glycerol are small molecules (monomers), not macromolecules; phospholipids are lipids, not in the same category.
• C: Starch and amylose are polymers (polysaccharides); glucose is a monomer.
• D: Sucrose is a disaccharide and deoxyribose a monosaccharide; only amylopectin is a polysaccharide.

Final answer: A