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. Cell biology is a fascinating branch of biological sciences, providing answers to hitherto unanswered questions. It is the mother science to areas such as molecular biology, molecular genetics, biotechnology, recombinant DNA technology etc. During the last few decades, the science of cell biology has grown at an unprecedented pace with the consequence that voluminous information has accumulated on the subject. Cell and molecular biology is an every dynamic area of life sciences where the core activity of all biological developments are studied in depth. This comprehensive book provides a concise coverage of every topic in cell and molecular biology from the fundamental aspects to the latest developments in a simple and lively manner. The present book titled Cell and Molecular Biology deals with both gross and molecular structure of cell in all its structural and functional manifestations. There are also chapters on genetic engineering and immunology as the understanding of these are very vital for comprehending the expressions of cell machinery.