Biochemistry (biological chemistry - the study of chemical processes occurring in living organisms. Biochemistry studies the processes of metabolism, as well as the chemical composition of tissues and organs, chemical nature and functions of proteins, nucleic acids, carbohydrates, lipids, enzymes, vitamins, hormones and other biologically important compounds. Biochemistry is divided into biochemistry of plant, microbial biochemistry, biochemistry of animals etc. For medicine particularly important medical biochemistry, studying the chemistry of normal and pathological processes occurring in humans, and clinical biochemistry, the subject of which is the study of the peculiarities of metabolism processes in the body of the patient, as well as the development and application of biochemical methods for the diagnosis, prognosis and treatment.