In this book, Dr. Paul Sanghera, the best-selling author of several books in science and technology, provides cohesive, concise, yet comprehensive coverage of the key concepts of molecular and cellular biology in an accessible way. The book presents material in a logical learning sequence: each section builds upon previous sections and each chapter upon previous chapters. All concepts simple and complex are well-defined and clearly explained the first time they appear. There is no hopping from topic to topic and no technical jargon without explanation. This book is useful for both students and professionals in biology. Students can use the distilled information in this book to excel in their assignments and exams. Even though this book is self-contained, it works as a great supplement to any textbook in general biology. Professionals in a biology-related field can use it for a quick reference or for a quick review of fundamental concepts, whereas newcomers can use it as their gateway into the field to quickly ramp up to speed. The chapters in the book have the following special features: * Note. A Note is used to present additional helpful material related to the topic being described or to emphasize a concept. * Caution. A Caution is used to highlight a point which either is crucial or may not fit into the commonsense framework of things. * Think About It. This feature presents questions or simple problems with answers and solutions to emphasize critical concepts. * Problems. Problems are presented with solutions to explain mathematical concepts. * Fascinating Fact. This feature singles out biological facts which are simply amazing. * Review Questions. Review questions with answers are presented at the end of each chapter in order to enable you to test your knowledge and detect your strengths and weaknesses. * Glossary. This feature presents quick access to key terms."