25 Feb


Organisms of different species differ not only in their morphology and physiology but also in the characteristics that make up their molecular structure resulting in different serotypes.  The proteins, polysaccharides, nucleic acids, and lipids define the molcular structure of an organism.  Some of the macromolecules such as proteins, lipoproteins, and nucleoproteins can act as antigens because when these molecules are introduced into an animal, they cause the formation of antibodies.  In order to produce antibodies, the substance must be foreign to the host organism.  The antigenic structure of each species of bacteria is unique to that species similar to our fingerprints.  These unique characteristics allow each species of bacteria to be differentiated from the next. pauln