The branch of science which studies the biological activities at a molecular level is known as molecular biology. There are a number of techniques used in molecular biology, some of these are molecular cloning, gel electrophoresis, polymerase chain reaction, microarrays, etc. Different approaches, evaluations, methodologies and advanced studies on molecular biology have been included in this book. It includes some of the vital pieces of work being conducted across the world, on various topics related to molecular biology. Through it, we attempt to further enlighten the readers about the new concepts in this field.