MICROANATOMY

Detailed explanation-1: -hemoglobin, also spelled haemoglobin, iron-containing protein in the blood of many animals-in the red blood cells (erythrocytes) of vertebrates-that transports oxygen to the tissues. Hemoglobin forms an unstable reversible bond with oxygen.

Detailed explanation-2: -The hemoglobin molecule has four binding sites for oxygen molecules: the iron atoms in the four heme groups. Thus, each Hb tetramer can bind four oxygen molecules. From the molecular weight of Hb, one can calculate that 1 g of Hb can combine with 1.39 ml of oxygen.

Detailed explanation-3: -It is composed of a protein called heme, which binds oxygen.

Detailed explanation-4: -So, the correct answer is ‘Ionic bond’.

Detailed explanation-5: -Heme groups and globins In fact, hemoglobin is composed of four globin proteins-two alpha chains and two beta chains-each with a heme group. The heme group contains one iron atom, and this can bind one molecule of oxygen.