Question

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

Explanation:

Proteins are macromolecules composed of amino - acid subunits. Carbohydrates are made of monosaccharides, lipids are not made of amino acids, and nucleic acids are made of nucleotides.

Answer:

D. protein