The field of biochemistry studies the structural and functional aspects of biomolecules like lipids, proteins, carbohydrates and nucleic acids as well as their interactions with each other. It helps in understanding the processes occurring within living organisms. The applications of biochemistry are in medicine, nutrition and agriculture. Molecular biology is a branch of biochemistry. It studies the interactions of DNA, proteins and RNA as well as their biosynthesis. The study of molecular biology is mostly quantitative and a lot of emphasis is placed on the understanding of gene structure and function. There has been rapid progress in these fields in recent years and their applications are finding their way across multiple industries. This book presents the complex subjects of biochemistry and molecular biology in a comprehensible manner. It will serve as a reference text for students as well as biologists, researchers, geneticists and other experts working on this field.