The Most Important Function of the Globin (Protein)portion of a Hemoglobin

Multiple Choice

The most important function of the globin (protein) portion of a hemoglobin molecule is to

A) directly bind oxygen.
B) promote binding of oxygen to the heme group.
C) allow release of oxygen from the heme group.
D) facilitate the reaction of CO₂ and H₂O.
E) cause constriction of the capillaries.