Which statement correctly describes a macromolecule?

• A. Formed by ionic bonding between small units
• B. Inorganic mineral compounds
• C. Polymers made up of covalently linked chains of monomers
• D. Consists only of amino acids

Answer: (C)

Macromolecules are large biological molecules formed by linking many small units (monomers) into long chains through covalent bonds. This polymeric structure is what makes them big and complex. So the description that best fits is: polymers made up of covalently linked chains of monomers. Examples include proteins built from amino acids, nucleic acids from nucleotides, and polysaccharides from sugar units. Ionic bonds aren’t what typically build the backbone of macromolecules, and inorganic minerals aren’t organic macromolecules. Also, not all macromolecules are solely amino acids, since nucleic acids and polysaccharides are also macromolecules.