Which type of macromolecule is made up of subunits that are called amino acids?

The correct answer is proteins.

Explanation:

The four major type of macromolecules are nucleic acids, carbohydrates, lipids, and proteins. The proteins are macromolecules made up of amino acids as their primary unit. Each amino acid form a long polypeptide chain, which can be further modifies into a specific shape giving rise to a functional protein of the biological system.

the real answer is b. scintillation counter