Final answer:
Hemoglobin exhibits a quaternary structure, with multiple subunits coming together to form the functional protein that transports oxygen.
Step-by-step explanation:
Like all allosteric proteins, hemoglobin displays quaternary structure. Hemoglobin is a complex protein that is responsible for transporting oxygen throughout the body, and its functionality is attributed to its sophisticated structure. This protein consists of multiple subunits - specifically, two alpha (α) and two beta (β) subunits that come together via non-covalent interactions (such as hydrogen bonds, ionic bonds, and Van der Waals' forces). Together, these interactions give hemoglobin its quaternary structure, which is critical for its ability to bind oxygen effectively.