Ever since James Watson and Francis Crick proposed their double-helical structure of DNA in 1953, biology has been in the throes of a revolution in knowledge at the molecular level. This Schaum's Outline was written to help bring order and understanding to this rapidly expanding field. As a succinct overview of the subject, it will supplement any molecular biology course or provide the foundation needed for advanced courses. The text material is presented in a question and answer format; each concept is explained as an answer to a specific question. At the end of each chapter are objective questions of several kinds; multiple choice, true-false, fill-ins, and matching. These objective questions can be used to evaluate the extent to which the text material has been mastered, while also preparing the student for this kind of examination format.