Final answer:
The most likely formula to represent a protein molecule is a. OC 685H 1068N 1960 211$ 5.
Step-by-step explanation:
The most likely formula to represent a protein molecule is a. OC 685H 1068N 1960 211$ 5. This formula indicates the presence of carbon (C), hydrogen (H), and nitrogen (N), which are common elements found in proteins. The numbers indicate the number of atoms of each element present in the molecule. Protein molecules are composed of long chains of amino acids, which contain these elements.