Which of the Following Is an Example of a Macromolecule?

A macromolecule is a large molecule built from many smaller subunits bonded together. The four main examples are carbohydrates, lipids, proteins, and nucleic acids. So if you are asked which of the following is an example of a macromolecule, any answer naming one of those four classes — such as a protein, a starch, or DNA — is correct. These four groups make up most of the structural and functional material in living cells.

Understanding Macromolecules

A macromolecule is a very large molecule, typically made by joining many small repeating units called monomers into long chains. In biology, “macromolecule” almost always refers to one of four classes, and recognizing these classes is the fastest way to spot a valid example.

• Carbohydrates — sugars and starches; built from monosaccharides like glucose. Example: cellulose in plant cell walls.
• Lipids — fats, oils, and steroids; largely nonpolar and not built from true repeating monomers. Example: a triglyceride.
• Proteins — chains of amino acids folded into functional shapes. Example: hemoglobin, which carries oxygen in blood.
• Nucleic acids — chains of nucleotides that store and transmit genetic information. Example: DNA, which carries hereditary instructions (National Human Genome Research Institute).

If an answer choice is one of these four, it is a macromolecule. If it is a single small molecule — like a lone glucose, an amino acid, or a water molecule — it is a monomer or a simple molecule, not a macromolecule.

Correct Answer and Examples

The correct answer is whichever option names a carbohydrate, lipid, protein, or nucleic acid. For example, “protein” and “DNA” are both valid answers because each is a large polymer assembled from many smaller units, as described in standard cell biology lessons (Khan Academy).

Quick worked example: suppose the choices are water, glucose, and a protein. Water is a tiny molecule. Glucose is a single monosaccharide — a monomer. A protein is a long chain of amino acids, so the protein is the macromolecule.

The most common trap on these questions is confusing a monomer with its polymer. Amino acids, monosaccharides, and nucleotides are the building blocks; the macromolecules are the long chains formed when those blocks link together. A second trap is treating a small molecule like water or a single ion as a macromolecule — it is neither a polymer nor large.

A brief health note: this is general educational science, and questions about a specific diet, condition, or lab result should be directed to a qualified professional.

Key Takeaways

• A macromolecule is a large molecule, usually a polymer made of many smaller monomer subunits.
• The four main classes are carbohydrates, lipids, proteins, and nucleic acids — any of these is a valid example.
• Amino acids, monosaccharides, and nucleotides are monomers, not macromolecules; do not confuse them with their polymers.
• Small molecules like water are not macromolecules, so eliminate them first when narrowing answer choices.