Study of the chemical reactions required for life to exist and function, usually a focus on the cellular level

• Enzymology – study of enzymes
• Structural biology – a branch of molecular biology, biochemistry, and biophysics concerned with the molecular structure of biological macro-molecules
• Systems biology – the study of the integration and dependencies of various components within a biological system, with particular focus upon the role of metabolic pathways and cell-signaling strategies in physiology