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A-Level Biology Revision

Free topic-by-topic A-Level Biology revision — key concepts, common mistakes and interactive games for every major topic.

Pick a topic to revise the core concepts, check the mistakes examiners look for, and practise with free games. No login required.

A-Level Biology topics

Biological MoleculesCarbohydrates, lipids, proteins and nucleic acids, water, enzymes and the structure of biological molecules.Cells & TransportCell structure and the cell cycle, transport across membranes, and exchange surfaces and transport systems.DNA & Gene ExpressionDNA replication, protein synthesis, mutations, and the control of gene expression.Energy, Respiration & PhotosynthesisPhotosynthesis and respiration — the biochemistry of how cells capture, store and release energy.Coordination & ResponseNervous and hormonal coordination, homeostasis, the nerve impulse and muscle contraction.Immunity & DiseasePathogens and the immune response, vaccination, antibodies and disease risk factors.Evolution & BiodiversityGenetic variation, natural selection, speciation, classification and measuring biodiversity.Ecology & EcosystemsPopulations and communities, energy flow, nutrient cycles and the management of ecosystems.

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