This is a reference book that takes biology aficionados on a journey of learning about the building block of living organisms, DNA and genetics, and the omnipresent creatures, the bacteria, along with their implications and uses in the field of agriculture and pharmaceuticals. It explains the role of Bacteria and genetics in the functioning of. The book is supplied with questions after each chapter for a better grasp and revision of each topic. The book elucidates practical experiments in these fields and explanatory theory to give the readers in-depth knowledge of the topic.