Cambridge A-Level Biology (9700) exam preparation. AS: Cell Structure, Biological Molecules, Enzymes, Cell Membranes, Mitosis, Nucleic Acids, Transport, Gas Exchange, Diseases, Immunity. A2: Energy/Respiration, Photosynthesis, Homeostasis, Coordination, Genetics, Evolution, Biodiversity. Practical: P3 (Advanced) and P5 (Planning, Analysis, Evaluation).