Biochemistry (Biochemistry) is the study of the chemical composition of organisms. By study the molecular structure of substances within cells and the change of the substance to substance.The study includes the change of all matter within cells called metabolism (Metabolism) to study the metabolism occurs normally, and while the pathogenesis after disease.Control of the reaction and metabolism (Pathways and Metabolism) as well as the structure of protein, protein synthesis, regulation and gene expression. And so on.