Molecular biology
Molecular biology is the study of the molecular basis of biological activity within and between cells, including biomolecular synthesis, modification, processes, and interactions. Molecular biology is the study of the chemical and physical structure of biological macromolecules. Molecular biology was initially defined as a method focused on the underpinnings of biological phenomena - discovering the structures of biological molecules as well as their interactions, and how these interactions explain classical biology data. Molecular biology is more than just the study of biological molecules and their interactions; it is also a set of tools that have been developed since the field's inception that have allowed scientists to learn about molecular processes.