Though strictly speaking, an antibody is not the same as an immunoglobulin; B cells can produce two types of immunoglobulins-surface immunoglobulins, which are B cell receptors; and secreted immunoglobulins, which are antibodies. So antibodies are one of two classes of immunoglobulins.ach antibody binds to a specific antigen; an interaction similar to a lock and key. An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shape protein produced by plasma cells that is used by the immune system to identify and neutralize pathogens such as bacteria and viruses.
About 95 percent of the dry weight of the red blood cell consists of hemoglobin, the substance necessary for oxygen transport. Hemoglobin is a protein; a molecule contains four polypeptide chains (a tetramer), each chain consisting of more than 140 amino acids.
Hemoglobin Structure. Hemoglobin is the molecule that is responsible for the oxygen carrying capacity of a red blood cell. It also gives these cells a red color and is a combination of heme and globin. Heme is formed when succinyl-CoA binds with glycine to form a pyrrole molecule.part from carrying oxygen, which is the main function of red blood cell, it can also conduct the following functions. 1  Release the enzyme carbonic anhydrase which allows water in the blood to carry carbon dioxide to the lungs where it is expelled.