Microorganisms, especially bacteria and yeasts, are also used by many scientists as a tool for molecular biology research. Bacterial genetics is a study of heritable information mechanisms in bacteria, their chromosomes, plasmids, transposons and phages. The large size of the bacterial population ensures that even incredibly rare genetic events are likely to happen. This genetic variation makes it easy for individual members of large populations of bacteria to quickly develop new characteristics. This book deals with an essential introduction to the molecular genetics of bacteria emphasizing the basic concepts and the latest developments. Over the last 40 years, the study of the genetics, biochemistry and physiology of bacteria has provided concepts and methods for the study of all types of cells at the molecular level.