Beginning as an interdisciplinary enterprise, it is the study of chemical changes within, and produced by, living organisms. More specifically, it is the study of the chemical reactions and interactions that take place in living organisms, especially the structure and function of their components, such as enzymes, proteins, carbohydrates, lipids, nucleic acids, and other molecules present in cells.
See Biophysics, Biology, Discipline, Enzyme, Inorganic chemistry, Interdiscipline, Krebs cycle (or tri-carboxylic acid, TCA, cycle), Lipids, Nucleic acid, Proteins