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

Option D, Protein

Explanation:

Amino acids are the sub-units of protein. There are twenty different kind of amino acids which can be grouped in different ways to make proteins.  

An amino acids is an organic molecule that consists of a) a carboxyl group, b) an amino group and c) an organic R group which are connected to a carbon atom. This carbon atom attaches with other amino acids at their central carbon atom position to form the macro molecule protein.