Biochemistry and molecular biology are important branches of biology, whose research object is living organisms. It expounds the material composition and operation mechanism of life from the molecular level, so biochemistry is the chemistry of living organisms. Molecular biology is the study of the structure and function of biological macromolecules (proteins, enzymes, nucleic acids, polysaccharides, etc.) and the transmission and expression of genetic information, sometimes especially the study of nucleic acid macromolecules. Biochemistry and molecular biology have become the leading disciplines of modern biology, and the related contents have penetrated into all life sciences, and derived many interdisciplinary subjects. Biochemistry and molecular biology are a powerful tool in the research of life science, which plays an important role in the development of life science, especially medicine.