How many globin chains does each heme group possess to bind oxygen?

Each heme group possesses one globin chain that binds to one oxygen molecule. However, the question relates to the structure of hemoglobin, which is composed of four heme groups, each associated with a globin chain. In total, hemoglobin consists of four globin chains, allowing it to carry four molecules of oxygen—one for each heme group. This essential feature enables hemoglobin to effectively transport oxygen from the lungs to tissues throughout the body. Thus, the presence of four globin chains aligns perfectly with the ability of hemoglobin to bind four oxygen molecules, demonstrating the functional significance of the globin chain composition in oxygen transport.