AP BIOLOGY

Detailed explanation-1: -Haemoglobin (Hb) is a type of globular protein present in red blood cells (RBCs), which transports oxygen in our body through blood. It is a tetrameric protein and contains the heme prosthetic group attached to each subunit.

Detailed explanation-2: -Hemoglobin is a red cell protein that facilitates oxygen and carbon dioxide transport (Chapter 48). There are approximately 640 million molecules of hemoglobin in each red blood cell. Hemoglobin consists of four polypeptide chains (two and two chains).

Detailed explanation-3: -Hemoglobin is the most important component of red blood cells. It is composed of a protein called heme, which binds oxygen. In the lungs, oxygen is exchanged for carbon dioxide.

Detailed explanation-4: -The hemoglobin molecule is composed of 4 polypeptide chains and 4 heme groups containing iron, and the oxygen binds to iron in heme.

Detailed explanation-5: -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.