Biochemistry, sometimes called biological chemistry, is the study of chemical processes within and relating to living organisms. Biochemical processes give rise to the complexity of life. Biochemistry is closely related to molecular biology, the study of the molecular mechanisms of biological phenomena. Chemical biology deals with how chemistry can be applied to solve biological problems while biochemistry is the study of the chemistry of biology. In general, the chemical biology major focuses on small molecules while the biochemistry major focuses on proteins and nucleic acids. Chemical biology is one field that exists in the overlap between biology and chemistry. It involves using the techniques, tools, and methods of chemistry to the study of biological systems. ... They study the chemical reactions that happen inside organisms and the molecular make up of compounds found in organisms.