This book is written mostly from the viewpoint of the basic scientist who works at the cellular and molecular level. As molecular biology is one of the fore front subjects in research and development these days, it has become almost necessary for the students to have a hold on this subject. Coupled with the molecular biology are the biotechniques employed in every walk of research. A student aspiring to be a researcher needs to have a fair knowledge of the basic lab techniques used in R&D. The book is divided into two parts, one covering the molecular biology and other covering biotechniques. Written in lucid language to be easy for the beginners reading these two subjects for the first time, it comprises of two units, each of which have been written according to the needs of the student at the primary level.