<span>A. Proteins are polymers (many units) of amino acids.
</span> <span>We can arrange the following entities from sizes smallest to largest in: </span><span><span> 1. </span>Carbon atom. Consider the carbon atom in the periodic table which evidently small in size. Like any other atom such as hydrogen and oxygen.</span> <span><span> 2. </span>Monomer. Is a singular molecule that can combine itself with elongated chains and other molecules. And thus form,</span> <span><span>3. </span>Polymer. Polymers are made from a complex amalgamation of monomers.</span> <span><span>4. </span>Macromolecule. And thus the macromolecules from the word macro are the biggest component. Which forms the lipid, proteins, RNA enzymes in the cell. </span>