Question

which type of macromolecule is made up of subunits that are called amino acids?
○ carbohydrate
○ lipid
○ nucleic acid
○ protein

Explanation:

To determine the macromolecule made of amino acid subunits, we analyze each option:

• Carbohydrates are made of monosaccharides (e.g., glucose), not amino acids.
• Lipids are a diverse group (e.g., fats, phospholipids) and not built from amino acids.
• Nucleic acids (DNA, RNA) are made of nucleotides, not amino acids.
• Proteins are polymers formed by linking amino acids through peptide bonds. So proteins are the macromolecules with amino acid subunits.

Answer:

protein (the option corresponding to "protein" among the choices)