- B1Cell-level systems — eukaryotic/prokaryotic cells, microscopy, mitosis, transport across membranes (diffusion, osmosis, active transport)
- B2Scaling up — cell differentiation, stem cells, surface area to volume, exchange surfaces, transport in plants and animals
- B3Organism-level systems — nervous system, hormones, homeostasis (blood glucose, water balance, temperature)
- B4Community-level systems — ecosystems, food webs, nutrient cycles, biodiversity, sampling techniques
- B5Genes, inheritance and selection — DNA structure, sexual vs asexual reproduction, Mendelian genetics, evolution by natural selection
- B6Global challenges — biotechnology, GM crops, monoclonal antibodies, gene therapy, disease (communicable + non-communicable), drug development