We are living in the age of microbiology and molecular biology.The enormous knowledge that has accumulated in the field ofbiology, biochemistry, genetics and molecular biology during thelast century has totally revolutionized the approach for the studyof life and living beings. All most daily come reports of newdiscoveries on the exciting branch of science. Life is now regardedas the expression and interaction of biomolecules and all thebiological process are the result of biochemical reactions occuringat the cellular level. The field of molecular microbiology concernsparticularly with those biomolecules that are related to gene andthe gene product. It is also associated with understanding andexplaining the mechanisms responsible for the storage, transmissionand expression of biological information at molecular level.