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Free Biology A-Level study guide. 248 lessons.
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ATPBinary FissionBinary FissionBlood VesselsCalvin Cycle - Step 1: Formation of the glycerate 3-phosphateCalvin Cycle - Step 2: Formation of triose phosphateCalvin Cycle - Step 3: Regeneration of ribulose bisphosphateCarbohydratesDNA and RNADNA replicationEnzymesFood Tests (Carbohydrates, lipids and proteins)Lesson 1: An IntroductionLesson 1: An IntroductionLesson 1: An IntroductionLesson 1: An Introduction to ATPLesson 1: An Introduction to BiologyLesson 1: An Introduction to CarbohydratesLesson 1: An Introduction to CellsLesson 1: An Introduction to EukaryotesLesson 1: An Introduction to GeneticsLesson 1: An Introduction to LipidsLesson 1: An Introduction to Magnification and MicroscopesLesson 1: An Introduction to PhotosystemsLesson 1: An Introduction to Pulmonary PhysiologyLesson 1: An Introduction to StarchLesson 1: An Introduction to WaterLesson 1: Biological Molecules - An Introduction to BiomoleculesLesson 1: Cell MembranesLesson 1: Chemistry in BiologyLesson 1: DNA and RNA DefinitionsLesson 1: Evolution and BiomoleculesLesson 1: Exchange SurfacesLesson 1: Food Tests (Reducing Sugars)Lesson 1: How are they linked?Lesson 1: Lung DiseasesLesson 1: Non-Coding and Coding DNALesson 1: Optical MicroscopesLesson 1: Phases of the Cell CycleLesson 1: Solving Problems in a Practical ContextLesson 1: SpirometryLesson 1: Stages of the Immune ResponseLesson 1: The Importance of EnergyLesson 1: What are antigens?Lesson 1: What is a protein?Lesson 1: What is Genomics?Lesson 1: What is Photosynthesis?Lesson 10: Control of Water Loss in PlantsLesson 10: Required Practical 3 - Investigating Water Potential (Measuring Change in Mass)Lesson 10: Sodium-Potassium Pump (Purpose)Lesson 10: The Active SiteLesson 11: Active Site TheoriesLesson 11: Eukaryotic Cell Division - An Introduction to the Cell CycleLesson 12: Factors Affecting Enzyme Activity - Introduction [QUIZ]Lesson 13: Factors Affecting Enzyme Activity - Temperature and pHLesson 14: Factors Affecting Enzyme Activity - Substrate and Enzyme ConcentrationLesson 2: A Biogeochemical CycleLesson 2: Amino Acids, Dipeptides and PolypeptidesLesson 2: AmyloseLesson 2: An Introduction to Electron MicroscopesLesson 2: An Introduction to Inorganic ionsLesson 2: An Introduction to MicroscopyLesson 2: An Introduction to ThylakoidsLesson 2: Antigens and IdentificationLesson 2: ATP v Glucose - A ComparisonLesson 2: Body surface exchangeLesson 2: Command WordsLesson 2: Common MisconceptionsLesson 2: Equipment and ApparatusLesson 2: Evidence for EvolutionLesson 2: ExamplesLesson 2: Examples of Monomers and PolymersLesson 2: Fatty AcidsLesson 2: Food Tests (Non-Reducing Sugars)Lesson 2: InterphaseLesson 2: Key Terms - Genes and AllelesLesson 2: Malignancy and InterphaseLesson 2: Membrane StructureLesson 2: MonosaccharidesLesson 2: NucleotidesLesson 2: OrganellesLesson 2: Peak expiratory flowLesson 2: PhagocytosisLesson 2: Photosynthesis and EnergyLesson 2: Preparing MicroscopesLesson 2: The Calvin CycleLesson 2: The Light Dependent ReactionLesson 2: The Quantum AtomLesson 2: What is DNA?Lesson 2: What's Assessed?Lesson 3: A Recap on CellsLesson 3: Algal (agal) and Fungal Cells [quiz next]Lesson 3: AmylopectinLesson 3: Antigens and MedicineLesson 3: ATP v Glucose - A ComparisonLesson 3: Biological Molecules - Condensation ReactionsLesson 3: Cells - DiffusionLesson 3: DiffusionLesson 3: DisaccharidesLesson 3: DNA Replication - DefinitionsLesson 3: Effects of Lung DiseasesLesson 3: Ethanol and SterilisationLesson 3: Food Tests (Starch)Lesson 3: Forming a Water MoleculeLesson 3: From the past!Lesson 3: Insects - The Tracheal SystemLesson 3: IronLesson 3: Key Terms - Phenotype and GenotypeLesson 3: Microscope ArtefactsLesson 3: More on the Calvin CycleLesson 3: Photosynthesis and the Carbon Cycle (A/A* content)Lesson 3: Primary and Secondary StructureLesson 3: Question StatementsLesson 3: ReceptorsLesson 3: Structure of DNALesson 3: T-CellsLesson 3: The Mitotic PhaseLesson 3: The Photoionisation of ChlorophyllLesson 3: The Purpose of ATPLesson 3: Thylakoids and GranaLesson 3: Transmission Electron Microscopes (TEMs)Lesson 3: TriglyceridesLesson 3: What causes cancer?Lesson 3: What is a spirometer?Lesson 3: What's Assessed?Lesson 4: Antigens and Blood TransplantsLesson 4: B-CellsLesson 4: Biological Molecules - Hydrolysis ReactionsLesson 4: Carbohydrates (Functions of Disaccharides)Lesson 4: Cell FractionationLesson 4: Cells - OsmosisLesson 4: Components of the Membrane - PhospholipidsLesson 4: Definitions of Eukaryotes and ProkaryotesLesson 4: DNA Replication - ProcessLesson 4: Energy from PhotoionisationLesson 4: Food Tests (Lipids)Lesson 4: Gibbs Free Energy (Optional)Lesson 4: HydrogenLesson 4: Importance of Energy and the Nutrient CycleLesson 4: Insects - SpiraclesLesson 4: Measuring Lung Function in SpirometryLesson 4: Phases of MitosisLesson 4: Phenotypes in a Harris's HawkLesson 4: PhospholipidsLesson 4: Proto-oncogens and Tumour SuppressorsLesson 4: Question Paper 1 and 2Lesson 4: Respiration and EnergyLesson 4: Scanning Electron Microscopes (SEMs)Lesson 4: Smoking and Lung CancerLesson 4: Tertiary StructureLesson 4: The Organisation of CellsLesson 4: The Properties of Water (Part 1)Lesson 4: The StromaLesson 4: The TracheaLesson 4: Time ManagementLesson 4: Uses and Storage of GlucoseLesson 4: What is a Genome?Lesson 4: Where is ATP used?Lesson 5: Aerobic RespirationLesson 5: An Introduction to CheckpointsLesson 5: An Introduction to Photoautotrophism (Part 1)Lesson 5: Antibody ProductionLesson 5: ATP Reactions (Hydrolysis)Lesson 5: ChromatinLesson 5: Components of the Membranes - CholesterolLesson 5: Diffusion RateLesson 5: Dominant AllelesLesson 5: EfficiencyLesson 5: ExceptionsLesson 5: Food Tests (Proteins)Lesson 5: ProphaseLesson 5: Pulmonary Ventilation RateLesson 5: Quaternary StructureLesson 5: Question Paper 1 and 2Lesson 5: Redox ReactionsLesson 5: Reducing Sugar Food TestsLesson 5: Semi-Conservative ReplicationLesson 5: Similarities and DifferencesLesson 5: The Basic Units of LifeLesson 5: The Immune ResponseLesson 5: The Light Dependent Reaction (Summary)Lesson 5: The LungLesson 5: The Properties of Water (Part 2)Lesson 5: The Supernatant and the PelletLesson 5: What is pH? (Wider Understanding)Lesson 6: An Introduction to Photoautotrophism (Part 2)Lesson 6: Anaerobic RespirationLesson 6: ATP Reactions (Condensation)Lesson 6: Birds - Exchange Systems (Optional)Lesson 6: Cellular and Humoral ResponseLesson 6: Codominant AllelesLesson 6: CoenzymesLesson 6: G1, G2 and M checkpointsLesson 6: Haemoglobin (Definitions and Dissociation)Lesson 6: MetaphaseLesson 6: Pulmonary Physiology in FishLesson 6: Question Paper 1 and 2Lesson 6: Reducing Sugar Food Tests 2Lesson 6: SodiumLesson 6: Stages of the Immune ResponseLesson 6: Steps of the Light Dependent Reaction (Part 1)Lesson 6: Temperature's Effect on the MembranesLesson 6: The Organisation of Cells - Tissues [quiz next]Lesson 6: Transcription CHECKLesson 7: AnaphaseLesson 7: Birds - Differences (Optional)Lesson 7: Cells - An Introduction to Prokaryotic CellsLesson 7: CyclinsLesson 7: EnergyLesson 7: Haemoglobin (Affinity and Quaternary Structure)Lesson 7: Non-Reducing Sugar Food TestsLesson 7: PhosphateLesson 7: PhotoautotropismLesson 7: Primary Immune ResponseLesson 7: Question Paper 3 and The EssayLesson 7: Recessive allelesLesson 7: Required Practical 4 - Investigating permeability of cell membranesLesson 7: Steps of the Light Dependent Reaction (Part 2)Lesson 7: The Organisation of Cells - OrgansLesson 7: Translation CHECKLesson 7: Writing Equations on a Computer (Introduction)Lesson 8: An Introduction to Eukaryotic CellsLesson 8: ChloroplastsLesson 8: DNA (Recap)Lesson 8: Fish - GillsLesson 8: Haemoglobin (Haem Groups)Lesson 8: Helpful ResourcesLesson 8: PolysaccharidesLesson 8: Secondary Immune ResponseLesson 8: Steps of the Light Dependent Reaction - Chemosmosis (Part 3)Lesson 8: TelophaseLesson 8: The Essay QuestionLesson 8: The Organisation of Cells - Organ Systems (QUIZ AND WORKSHEET NEXT)Lesson 8: The Sodium-Potassium PumpLesson 8: Writing Equations on a Computer (LaTeX)Lesson 9: CalciumLesson 9: Cyclic and Non-Cyclic PhotophosphorylationLesson 9: EnzymesLesson 9: Fish - Counter-Current SystemLesson 9: Genome (recap)Lesson 9: Required Practical 3 - Investigating Water Potential (Making Serial Dilutions)Lesson 9: Sodium-Potassium Pump (An Introduction)Lesson a: Cells - VirusesLesson e: Cells - Investigating Mitosis - Required Practical 2LipidsMonomers and PolymersProteinsWater and Inorganic ions