Course lens · first assessment 2025
The IB Biology SL path, projected from the shared textbook without HL-only topics or extensions.
This lens removes every tagged HL extension while preserving the shared chapter sequence.
Begin molecular biology with the elements shared by living systems, the dose-dependent roles of trace elements, and the molecular explanation for water's life-supporting properties.
8 sections
473 minutes estimated
Follow energy and matter through enzyme-controlled pathways, ATP production in respiration, and carbon fixation in photosynthesis—from active-site collisions to chemiosmotic membranes.
6 sections
194 minutes estimated
Follow genetic information from faithful DNA copying through transcription, RNA processing and translation, then investigate mutation, gene editing and epigenetic control.
7 sections
238 minutes estimated
Connect chromosome organization to inheritance, predict simple and complex crosses, infer family genotypes, and test linkage models with recombination and chi-squared evidence.
8 sections
366 minutes estimated
Build cell biology from origin-of-life evidence through prokaryotic and eukaryotic organization, endosymbiosis, microscopy, viruses and rapid viral evolution.
7 sections
290 minutes estimated
Explain how membranes control exchange, organelles coordinate cellular work, geometry constrains size, and cell division preserves or reshuffles genetic information.
9 sections
355 minutes estimated
Explain how cells detect, transmit and integrate information through receptors, neurons, synapses, hormones, feedback systems and plant growth regulators.
6 sections
275 minutes estimated
Build a connected account of multicellular organization, animal and plant transport, gas exchange, reproduction and homeostasis through structure, gradients and feedback.
9 sections
622 minutes estimated
Connect nervous coordination to reflexes, enteric movement, skeletons and joints, sliding-filament contraction, motor-unit recruitment and whole-animal locomotion.
1 sections
143 minutes estimated
Build disease defence from skin and clotting through innate and adaptive immunity, then connect HIV, antibiotics, zoonoses, allergy and vaccination to population health.
7 sections
813 minutes estimated
Reconstruct ancestry with classification and cladistics, model how gene pools evolve and split, and connect adaptation, niches and competition to biodiversity.
6 sections
427 minutes estimated
Trace nutrition, energy, matter and population change through ecosystems, then evaluate succession, biodiversity loss, conservation and climate-driven disruption.
8 sections
965 minutes estimated