This book covers the concept and advances in cell biology with an emphasis on molecular paradigm. It introduces better understanding of molecular concepts and their integral role in structure and function of cell as a basic unit of life and also their integrative role of overall organization of organs. Many of the concepts have been explained using schematics diagrams provided with marker legends and footnote explanation. It would serve as a well advanced text to undergraduate and postgraduate students. It contains figurers and tables, which equip the book for intrinsic academic wealth. It shall be useful to the student of both the level UG and PG and to all those who are working in contemporarily sciences on molecular concepts including medical and pharmacy professionals. In addition, it is a valuable source for all those who are appearing in NET, GATE, SLATE and other competitive examinations opting biology as one of the subjects.