1 Introduction to biology 2 Molecules of life 3 Cellular organization 4 Movement of substances across the cell membrane 5 Metabolism and enzymes 6 Food and humans 7 Nutrition in humans 8 Gas exchange in humans 9 Transport of substances in humans 10 Nutrition and gas exchange in plants 11 Transpiration, transport and support in plants 12 The cell cycle and cell division &13 Reproduction in flowering plants 14 Reproduction in humans &15 Growth and development | 16 Stimuli, receptors and responses 17 Coordination in humans &18 Movement in humans 19 Homeostasis 20 Ecosystems &21 Photosynthesis &22 Respiration 23 Personal health and infectious diseases &24 Non-infectious diseases and disease prevention &25 Body defence mechanisms 26 Basic genetics &27 Molecular genetics 28 Biotechnology 29 Biodiversity 30 Origins of life and the evidence for evolution &31 Evolution and speciation | Human physiology regulation and control Applied ecology Microorganisms and humans Biotechnology |