Cell structure and microscopy
Cell structures and their functions, magnification, resolution and scale-bar calculations, with diagrams and worked A-level Biology examples.
AQA 3.2.1 · OCR A 2.1.1
Read the chapterTwelve chapters, 28 diagrams and 36 worked examples. Each chapter gives its AQA and OCR A connections and lists the topics still to study.
Membranes and transport
Membrane structure, diffusion, osmosis, active transport and co-transport, with diagrams, worked examples and revision questions.
AQA 3.2.3 · OCR A 2.1.5
Read the chapter
Enzymes
Induced fit, activation energy, factors affecting enzyme activity and inhibition, with rate calculations and worked examples.
AQA 3.1.4 · OCR A 2.1.4
Read the chapter
DNA and protein synthesis
DNA base pairing, transcription, splicing, translation and mutations, with sequence diagrams and worked A-level Biology examples.
AQA 3.1.5, 3.4.2 · OCR A 2.1.3, 6.1.1
Read the chapter
Photosynthesis
Light-dependent reactions, the Calvin cycle, limiting factors and photosynthesis investigations, with diagrams and worked examples.
AQA 3.5.1 · OCR A 5.2.1
Read the chapter
Respiration
Glycolysis, the link reaction, Krebs cycle, oxidative phosphorylation and fermentation, with diagrams and worked calculations.
AQA 3.5.2 · OCR A 5.2.2
Read the chapter
Inheritance and meiosis
Meiosis, genetic crosses, allele probabilities and Hardy–Weinberg calculations, with chromosome diagrams and worked examples.
AQA 3.2.2, 3.4.3, 3.7.1, 3.7.2 · OCR A 2.1.6, 6.1.2
Read the chapter
Immunity and immune memory
Phagocytosis, B and T cells, antibodies, immune memory and active or passive immunity, with response diagrams and worked examples.
AQA 3.2.4 · OCR A 4.1.1
Read the chapterExchange surfaces and transport
Alveoli, fish gills, mammalian circulation, xylem and phloem, with diagrams and worked exchange and transport calculations.
AQA 3.3.1, 3.3.2, 3.3.4 · OCR A 3.1.1, 3.1.2, 3.1.3
Read the chapter
Nervous communication
Resting and action potentials, saltatory conduction, cholinergic synapses and summation, with diagrams and worked calculations.
AQA 3.6.1, 3.6.2 · OCR A 5.1.3
Read the chapterHomeostasis and the kidney
Blood glucose control, kidney filtration and reabsorption, and ADH, with feedback diagrams and worked solute calculations.
AQA 3.6.4 · OCR A 5.1.1, 5.1.2, 5.1.4
Read the chapter
Ecosystems, energy and nutrient cycles
Energy budgets, nitrogen cycling, ecological sampling, succession and conservation, with diagrams and worked population estimates.
AQA 3.5.3, 3.5.4, 3.7.4 · OCR A 4.2.1, 6.3.1, 6.3.2
Read the chapterAfter reading
Close the chapter and try explaining the process. If a step is missing, return to that section before trying the recall questions or an application case.