Biochemistry is the branch of science that explores the chemical processes within and related to living organisms (ref)
Biochemical pharmacology is concerned with the effects of drugs on biochemical pathways underlying the pharmacokinetic and pharmacodynamic processes and the subsequent therapeutic and the toxicological processes.
Bioorganic Chemistry addresses biological questions at the molecular level, using organic chemistry and principles of physical organic chemistry.
Clinical chemistry is the area of chemistry that is generally concerned with analysis of bodily fluids for diagnostic and therapeutic purposes.
Immunochemistry is the study of the chemistry of the immune system. This involves the study of the properties, functions, interactions and production of the chemical components of the immune system. It also include immune responses and determination of immune materials/products by immunochemical assays.
Molecular genetics is a sub-field of biology that addresses how differences in the structures or expression of DNA molecules manifests as variation among organisms.
Neurochemistry is the study of chemicals, including neurotransmitters and other molecules such as psychopharmaceuticals and neuropeptides, that control and influence the physiology of the nervous system
Physical biochemistry is a branch of biochemistry that deals with the theory, techniques and methodology used to study the physical chemistry of biomolecules. It also deals with the mathematical approaches for the analysis of biochemical reaction and the modelling of biological systems.