Course lens · first assessment 2025
The complete IB Biology HL path, including shared SL/HL material and every additional higher level extension.
Shared core material and clearly marked HL extensions appear in one continuous reading flow.
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
585 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.
10 sections
425 minutes estimated
Follow genetic information from faithful DNA copying through transcription, RNA processing and translation, then investigate mutation, gene editing and epigenetic control.
12 sections
525 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.
10 sections
509 minutes estimated
Build cell biology from origin-of-life evidence through prokaryotic and eukaryotic organization, endosymbiosis, microscopy, viruses and rapid viral evolution.
12 sections
662 minutes estimated
Explain how membranes control exchange, organelles coordinate cellular work, geometry constrains size, and cell division preserves or reshuffles genetic information.
10 sections
647 minutes estimated
Explain how cells detect, transmit and integrate information through receptors, neurons, synapses, hormones, feedback systems and plant growth regulators.
11 sections
881 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
1060 minutes estimated
Connect nervous coordination to reflexes, enteric movement, skeletons and joints, sliding-filament contraction, motor-unit recruitment and whole-animal locomotion.
6 sections
645 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
738 minutes estimated
Trace nutrition, energy, matter and population change through ecosystems, then evaluate succession, biodiversity loss, conservation and climate-driven disruption.
8 sections
1080 minutes estimated