Molecular Biology is an interdisciplinary field of science that deals with the fields of chemistry, structure and biology as it seeks to understand life and cellular processes at the molecular level. Molecular Biology mainly focuses on the determination of cell fate and differentiation, growth regulation of cell, Cell adhesion and movement, Intracellular trafficking. The relationship of signalling to cellular growth and death, transcriptional regulation, mitosis, cellular differentiation and organogenesis, cell adhesion, motility and chemotaxis are more complex topics under Cellular and Molecular Biology. Molecular biology explores cells, their characteristics, parts, and chemical processes, and pays special attention to how molecules control a cell’s activities and growth. The molecular components make up biochemical pathways that provide the cells with energy, facilitate processing “messages” from outside the cell itself, generate new proteins, and replicate the cellular DNA genome. To understand the behaviour of cells, it is important to add to the molecular level of description an understanding on the level of systems biology.