Cell, Molecular Biology and Molecular Genetics
Cell science or cytology, is a branch of science that reviews the diverse structures and elements of the cell and concentrates for the most part on the possibility of the cell as the fundamental unit of life. Molecular biology concerns the molecular basis of biological activity between biomolecules in the various systems of a cell, including the communications between DNA, RNA, and proteins and their biosynthesis, and the direction of these cooperations. Molecular genetics is the field of biology that studies the structure and function of genes at a molecular level and thus employs methods of both molecular biology and genetics. The study of chromosomes and gene expression of an organism can give insight into heredity, genetic variation, and mutations. This is useful in the study of developmental biology and in understanding and treating genetic diseases.