The aim in presenting this book to the undergraduate and postgraduate students to various Indian Universities is to provide them with an accurate and understandable matter on cell biology. The book is up-to-date with the addition of new material and also an attempt has been made to incorporate all the latest information. The contents have been developed to help honours and postgraduate students and also for the students of biotechnology. The subject matter in the present edition has been organized in such a way to match the syllabi of different universities. Effort has been made to make the book a ready reckoner on the subject. The chapters on Cytological Techniques, Plasma Membrane, Mitochondria, Nucleus, Chromosomes, Nucleic Acids, Protein Biosynthesis, Cell Growth, Ageing and Cancer cover latest and up-to-date information. In addition to cell morphology, physiological aspect of the cell has also been covered. Many figures have been added to make them more simple and in line with subject matter. Electron photographs of some subcellular structures have also been incorporated. Cytological techniques have been made more illustrative and simple. A glossary has been made in the end of the book so as to enable the students to learn the meaning and origin of the words used in the text. The diagrams are specially designed for clarity and simplicity.