Read the following passage.

Types of Protein

A: The major oxygen binding proteins are Hemoglobin and Myoglobin. They are slightly related in primary sequence. They have both groups have "heme" group. Myoglobin is a protein located in the muscle used for oxygen storage. It provides a supply of oxygen when oxygen is needed. Hemoglobin refers to proteins found in red blood cells, oxygen-binding protein, carry oxygen from the lung the deposit it through the cells of the body. Oxygen is critical to the body because it is needed for oxidative phosphorylation. 

B: There are two binding sites on the heme group. Each lies on different planes of the heme. They are called the 5th and 6th coordination sites. For both myoglobin and hemoglobin, the 5th coordination site is occupied with an imidazole ring leaving the 6th coordination site available for oxygen binding. There are two configurations of the heme: one that lacks the oxygen and the one with the oxygen. With the configuration lacking oxygen, the iron lays a bit outside in reference to the porphyrin plane because it cannot fit in the center of the heme. In the configuration that binds to the oxygen, the iron lies on the same plane as the poryphin's . The difference in the position of the iron group is due to difference in the magnetic properties of each configuration. The form which lack oxygen, the iron's electron cloud is too big which repels itself from the pyrophin plane.

C: Myoglobin is monomeric protein consisting of a single polypeptide chain. Each Myoglobin contains one binding site where it can bind to one oxygen. There are two forms of myoglobin. They are deoxymyoglobin and oxymyoglobin. Deoxymyoglobin is the form that lacks oxygen whereas oxymyoglobin is bounded to oxygen. Myoglobin functions as an oxygen storage protein rather than oxygen transport protein because it has very strong affinity for oxygen.

D: Hemoglobin is an iron-containing protein in the red blood cells that is responsible for the transport of oxygen from the respiratory organs (i.e. lungs) to the rest of the body (i.e. the tissues). Unlike myoglobin which consists of a single polypeptide chain, hemoglobin consists of 4 polypeptide chains. Two identical chains are denoted as alpha chains where the other two identical chains are denoted beta chains. 

E: Not given in any of the above paragraphs