In recent years, both the amount of molecular biology knowledge and its applications have exploded. With the burgeoning number of such courses and uses, experts have realized the urgent need for developing a suitable curriculum, possibly in the form of a textbook aimed at providing undergraduate and post graduate students. Principles and Practices, is designed to balance between two important aspects of the science. First aspect being, principles of molecular biology and the second aspect being, practice or the experimental approach in molecular biology. This book emphasis on wide range of molecular techniques and provides information to readers at all levels. Focusing on basic skill-building throughout, this book focuses on both conventional and innovative techniques and focuses on information relating to media, buffers and reagents preparations, experiments offering students and well as the teachers an authoritative frame of reference. It can also be used as a reference manual in most of the research laboratories.