Answer:
answer: c
Step-by-step explanation:
A hemoglobin molecule is made up of four
polypeptide chains, two alpha chains of 141
amino acid residues each and two beta
chains of 146 amino acid residues each . In the complete molecule, four subunits are closely joined, as in a three-dimensional jigsaw puzzle, to form a tetramer.
it also have a structure called quaternary structure, in which two or more polypeptide chains folded in to tertiary structure become associated in the final structure of the protein.
hope this will help !