Biochemistry is a frontier discipline, which studies the chemistry of life, so it must have a more or less relationship with other related biological disciplines. Biology always uses and permeates each other. There is more than one kind of organism, so biochemistry studies animals (including insects), plants and microorganisms. There are both differences and similarities between the two. Biochemistry has applications in medicine, health, agriculture and industry. It is a basic medical discipline and a basic agricultural discipline, but it has applications in industry, such as food processing, brewing, pharmacy, preparation of biological agents and tanning.

(1) Biochemistry is developed from organic chemistry and physiology.

It is still closely related to organic chemistry and physiology. Understanding the structure and properties of biomolecules and synthesizing them is the same subject in organic chemistry and biochemistry. Understanding physiological functions at the molecular level is obviously the same purpose of physiology and biochemistry. Judging from the current trend, physiology is using more biochemical methods and indicators to explain many physiological phenomena.

(2) Microbiology and immunology

Biochemical knowledge and technology are all used to study the metabolism of pathogenic microorganisms, the chemical properties of viruses and prevention and control measures. As far as immunology is concerned, both humoral immunity and cellular immunity must clarify the mechanism at the molecular level. Recently, some biochemists often use microorganisms, especially bacteria, as research materials. In this way, on the one hand, the results obtained in animals can be verified, on the other hand, because bacteria reproduce and grow extremely fast, it provides favorable conditions for studying heredity at the molecular level; So biochemical genetics came into being, also known as molecular genetics, and then genetic engineering was derived. It is not difficult to see how closely biochemistry is related to microbiology, immunology and genetics.

(3) Biophysics is developed from biochemistry.

The theories and methods of physics are mainly used to study the properties and structures of various biomolecules in organisms, the transformation of energy, and some processes that occur in organisms, such as bio-power generation and luminescence. Biophysics and biochemistry always complement each other. With the development of quantum chemistry, the mechanism of chemical reactions in organisms in the future, especially the mechanism of enzymatic reactions, must be explained by the changes of electronic structures in biomolecules and pharmaceutical molecules.

(4) Modern pharmacology is often based on the activity of enzymes, the action of hormones and the way of metabolism, so biochemical pharmacology and molecular pharmacology have emerged. Pathophysiology also pays attention to the use of biochemical principles and methods to study the imbalance of physiological functions and the disorder of metabolic pathways. Even histology, pathological anatomy, parasitology and other disciplines have begun to apply biochemical knowledge and methods to explore and solve their own problems. Before the names of these disciplines, the word "molecule" is now used, that is to say,