Question

a ______ is a large molecule.
options: polymer, macromolecule, micromolecule, amino acid
(image shows molecules like protein, lipid, etc.)

Explanation:

To solve this, we analyze the options:

• A polymer is a large molecule made of repeating subunits, but "macromolecule" is a more direct term for a large molecule.
• Micromolecule is a small molecule, so it's incorrect.
• Amino acid is a building block of proteins (a type of macromolecule), not a large molecule itself.
• Macromolecule is defined as a large molecule (e.g., proteins, nucleic acids, polysaccharides), so it fits the description.

Answer:

B. Macromolecule