AP Biology Practice Quiz — 20 Free Sample Questions

About the AP Biology

The AP Biology exam consists of two sections: a multiple-choice section with approximately 70 questions and a free-response section with 6 questions covering major topics including biochemistry, cell biology, genetics, evolution, physiology, and ecology. The exam emphasizes scientific practices including designing experiments, analyzing data, and developing claims supported by evidence. Students must understand fundamental concepts like photosynthesis, cellular respiration, DNA replication and protein synthesis, mitosis and meiosis, Mendelian and non-Mendelian genetics, natural selection, and population dynamics. Exam scoring ranges from 1-5, with a score of 3 typically earning college credit. The exam requires 12 hours of laboratory work throughout the course year. Average exam duration is 3 hours with approximately 180 questions and responses to analyze. Students should expect extensive preparation including concept review, practice exams, and development of scientific reasoning skills. Success requires deep understanding of biological mechanisms, ability to interpret biological data and experiments, and comprehensive grasp of evolution as the unifying principle of biology.