The revised fourth edition of Barron's AP Biologymanual presents: Three full-length practice exams with all questions answered and explained A detailed review of all test topics, which include: biochemistry, the cell, cell respiration, photosynthesis, cell division, heredity, the molecular basis of inheritance, classification, evolution, plants, animal physiology, the human immune system, animal reproduction and development, ecology, animal behavior, and an extensive laboratory section Multiple-choice and free-response questions with answers at the end of each chapter Every question in this book comes with an answer.