AQA · GCSE
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Eukaryotes and Prokaryotes
1Eukaryotes and ProkaryotesRead next2Plant and Animal CellsRead next3Sub-Cellular Structures and FunctionsRead next4Using a Light MicroscopeRead next5Cell SpecialisationRead next6Examples of Specialised CellsRead next7Cell DifferentiationRead next8Importance of Cell DifferentiationRead next9Development of Microscopy TechniquesRead next10Light vs Electron MicroscopesRead next11Magnification CalculationsRead next12Standard Form in MicroscopyRead next13Binary Fission in BacteriaRead next14Culturing Microorganisms SafelyRead next15Calculating Bacterial Population GrowthRead next16Zones of Inhibition and πr² CalculationsRead next17Chromosomes and DNARead next18The Cell CycleRead next19Stages of MitosisRead next20Functions of MitosisRead next21Stem Cells and Their FunctionsRead next22Therapeutic CloningRead next23Ethical Issues of Stem CellsRead next24Diffusion Across Cell MembranesRead next25Factors Affecting Diffusion RatesRead next26Surface Area to Volume RatiosRead next27Adaptations for Exchange SurfacesRead next28Osmosis Across MembranesRead next29Percentage Change in Mass CalculationsRead next30Graphs for Osmosis ExperimentsRead next31Active Transport in CellsRead next32Energy Requirement for Active TransportRead next33Comparing Diffusion, Osmosis, and Active TransportRead next
Levels of Organisation in Biology
1Levels of Organisation in BiologyRead next2Definition of Cells, Tissues, Organs, SystemsRead next3Structure and Function of Animal CellsRead next4Structure and Function of Plant CellsRead next5Organ Systems in AnimalsRead next6Organ Systems in PlantsRead next7Overview of the Digestive SystemRead next8Digestive Enzymes and Their FunctionsRead next9The Lock and Key TheoryRead next10Amylase and Carbohydrate DigestionRead next11Protease and Protein DigestionRead next12Lipase and Lipid DigestionRead next13Role of Bile in DigestionRead next14Testing for Carbohydrates, Proteins, and LipidsRead next15Effect of pH on Enzyme ActivityRead next16Structure and Function of the HeartRead next17Double Circulatory SystemRead next18Blood Vessels: Arteries, Veins, CapillariesRead next19Structure and Function of the LungsRead next20Components of Blood and Their FunctionsRead next21Red Blood Cells and Oxygen TransportRead next22White Blood Cells and ImmunityRead next23Platelets and Blood ClottingRead next24Risks and Benefits of Blood ProductsRead next25Coronary Heart Disease and Its CausesRead next26Stents and Their Role in TreatmentRead next27Statins and Cholesterol ControlRead next28Heart Valve Issues and TreatmentsRead next29Artificial Hearts and Heart TransplantsRead next30Definition of Health and DiseaseRead next31Interactions Between DiseasesRead next32Lifestyle Factors and Non-Communicable DiseasesRead next33Smoking and Lung CancerRead next34Alcohol and Liver DiseaseRead next35Obesity and Type 2 DiabetesRead next36Carcinogens and Cancer RiskRead next37Understanding Risk Factors in DiseaseRead next38Data Analysis in Disease StudiesRead next39Benign and Malignant TumoursRead next40Genetic and Lifestyle Risk Factors for CancerRead next41Plant Tissues and Their FunctionsRead next42Structure of Xylem and PhloemRead next43Root Hair Cells and Water UptakeRead next44Transpiration and Factors Affecting ItRead next45Stomata and Guard CellsRead next46Translocation in PlantsRead next47Investigating Transpiration RatesRead next48Measuring Stomata DistributionRead next
What Are Pathogens?
1What Are Pathogens?Read next2Types of Pathogens: VirusesRead next3Types of Pathogens: BacteriaRead next4Types of Pathogens: ProtistsRead next5Types of Pathogens: FungiRead next6How Pathogens SpreadRead next7Preventing the Spread of PathogensRead next8Measles: Symptoms and PreventionRead next9HIV and AIDS: Causes and ControlRead next10Tobacco Mosaic Virus in PlantsRead next11Salmonella: Causes and SymptomsRead next12Gonorrhoea: Treatment and PreventionRead next13Rose Black Spot in PlantsRead next14Malaria: Life Cycle and PreventionRead next15Human Body Defences: Physical BarriersRead next16Human Body Defences: Chemical BarriersRead next17Role of White Blood Cells: PhagocytosisRead next18Role of White Blood Cells: AntibodiesRead next19Role of White Blood Cells: AntitoxinsRead next20How Vaccines WorkRead next21Herd Immunity and Disease ControlRead next22Antibiotics: Uses and LimitationsRead next23Antibiotic Resistance: Causes and ConcernsRead next24Painkillers vs AntibioticsRead next25Challenges in Treating Viral InfectionsRead next26Drug Discovery: Historical ExamplesRead next27Stages of Drug DevelopmentRead next28Preclinical Testing of DrugsRead next29Clinical Trials: Phases and PlacebosRead next30Monoclonal Antibodies: Production ProcessRead next31Monoclonal Antibodies: Diagnostic UsesRead next32Monoclonal Antibodies: Therapeutic UsesRead next33Ethical Issues with Monoclonal AntibodiesRead next34Plant Diseases: Symptoms and DiagnosisRead next35Plant Pathogens: Examples and EffectsRead next36Nutrient Deficiencies in PlantsRead next37Physical Defence Mechanisms in PlantsRead next38Chemical Defence Mechanisms in PlantsRead next39Mechanical Adaptations in PlantsRead next
Photosynthesis Equation
1Photosynthesis EquationRead next2Photosynthesis as an Endothermic ReactionRead next3Role of Chloroplasts in PhotosynthesisRead next4Factors Affecting PhotosynthesisRead next5Temperature and Photosynthesis RateRead next6Light Intensity and Photosynthesis RateRead next7Carbon Dioxide Concentration and Photosynthesis RateRead next8Chlorophyll Levels and Photosynthesis RateRead next9Limiting Factors in PhotosynthesisRead next10Interpreting Photosynthesis Rate GraphsRead next11Inverse Square Law in PhotosynthesisRead next12Economic Importance of Photosynthesis FactorsRead next13Photosynthesis Practical: Light Intensity and PondweedRead next14Uses of Glucose in PlantsRead next15Testing for Starch, Glucose, and ProteinsRead next16Aerobic Respiration EquationRead next17Anaerobic Respiration in MusclesRead next18Anaerobic Respiration in YeastRead next19Comparing Aerobic and Anaerobic RespirationRead next20Energy Uses in OrganismsRead next21Response to Exercise: Heart and Breathing RatesRead next22Oxygen Debt and Lactic AcidRead next23Exercise Practical: Measuring Heart and Breathing RatesRead next24Lactic Acid Transport and Conversion in the LiverRead next25Metabolism OverviewRead next26Glucose Conversion to Starch, Glycogen, and CelluloseRead next27Formation of Lipids from Glycerol and Fatty AcidsRead next28Amino Acids and Protein SynthesisRead next29Respiration and Energy Transfer in MetabolismRead next30Breakdown of Excess Proteins into UreaRead next
Definition of Homeostasis
1Definition of HomeostasisRead next2Importance of HomeostasisRead next3Internal and External ChangesRead next4Control Systems in HomeostasisRead next5Receptors and StimuliRead next6Coordination CentresRead next7Effectors and ResponsesRead next8Structure of the Nervous SystemRead next9Functions of the Nervous SystemRead next10Central Nervous System (CNS)Read next11Sensory NeuronesRead next12Motor NeuronesRead next13Relay Neurones and SynapsesRead next14Reflex Actions and ImportanceRead next15Reaction Time PracticalRead next16Regions of the BrainRead next17Functions of the Cerebral CortexRead next18Functions of the CerebellumRead next19Functions of the MedullaRead next20Investigating Brain FunctionRead next21Risks of Brain ProceduresRead next22Structure of the EyeRead next23Functions of the Eye StructuresRead next24Accommodation in the EyeRead next25Defects of VisionRead next26Correcting Vision DefectsRead next27Control of Body TemperatureRead next28Thermoregulatory CentreRead next29Vasodilation and Cooling MechanismsRead next30Vasoconstriction and Heating MechanismsRead next31Shivering and Energy TransferRead next32Human Endocrine System OverviewRead next33Hormonal Coordination PrinciplesRead next34Pituitary Gland FunctionRead next35Adrenal Glands and HormonesRead next36Thyroid Gland and MetabolismRead next37Pancreas and Blood Glucose RegulationRead next38Ovaries and Reproductive HormonesRead next39Testes and TestosteroneRead next40Control of Blood Glucose LevelsRead next41Role of Insulin in Blood GlucoseRead next42Role of Glucagon in Blood GlucoseRead next43Type 1 Diabetes Causes and ManagementRead next44Type 2 Diabetes Causes and ManagementRead next45Negative Feedback MechanismsRead next46Adrenaline and Fight-or-Flight ResponseRead next47Thyroxine and Metabolic RateRead next48Hormones in the Menstrual CycleRead next49Role of FSH and LHRead next50Role of Oestrogen and ProgesteroneRead next51Contraceptive Methods and HormonesRead next52Fertility Treatments and HormonesRead next53Ethical Issues in Fertility TreatmentsRead next
Definition of an Ecosystem
1Definition of an EcosystemRead next2Biotic and Abiotic FactorsRead next3Interdependence in EcosystemsRead next4Competition in EcosystemsRead next5Adaptations of OrganismsRead next6Food Chains and Food WebsRead next7Energy Transfer in EcosystemsRead next8Pyramids of BiomassRead next9The Carbon CycleRead next10The Water CycleRead next11The Nitrogen CycleRead next12Decomposition and DecayRead next13The Role of Microorganisms in DecayRead next14Impact of Temperature and Moisture on DecayRead next15Required Practical: Investigating DecayRead next16Biodiversity and Its ImportanceRead next17Measuring BiodiversityRead next18Human Impact on BiodiversityRead next19Deforestation and Its EffectsRead next20Pollution and Its ImpactsRead next21Global Warming and Climate ChangeRead next22The Greenhouse EffectRead next23Impact of Rising Sea LevelsRead next24Conservation of BiodiversityRead next25Sustainable DevelopmentRead next26Maintaining Ecosystem BalanceRead next27Recycling and Waste ManagementRead next28Peat Bogs and Their ConservationRead next29Impact of Agriculture on EcosystemsRead next30Monoculture and Its EffectsRead next31Overfishing and Sustainable FisheriesRead next32Reforestation and AfforestationRead next33Impact of Urbanisation on EcosystemsRead next34The Importance of Biogeochemical CyclesRead next35Required Practical: Measuring BiodiversityRead next36Trophic Levels and Energy LossRead next37The Role of Apex Predators in EcosystemsRead next38Eutrophication and Its CausesRead next39Impact of Fertilisers on Water SystemsRead next40Invasive Species and Their EffectsRead next41Sampling Techniques in EcologyRead next42Quadrats and TransectsRead next43Required Practical: Sampling Using QuadratsRead next44Population Dynamics and Carrying CapacityRead next45Predator-Prey RelationshipsRead next46Ecological SuccessionRead next47Primary and Secondary SuccessionRead next48Impact of Climate on EcosystemsRead next49The Role of Keystone SpeciesRead next50Bioaccumulation and BiomagnificationRead next
DNA Structure and Function
1DNA Structure and FunctionRead next2The GenomeRead next3Chromosomes and GenesRead next4Alleles and Genetic VariationRead next5Sexual and Asexual ReproductionRead next6Meiosis Process and ImportanceRead next7Fertilisation and Genetic VariationRead next8Inheritance of TraitsRead next9Punnett Squares and Genetic CrossesRead next10Dominant and Recessive AllelesRead next11Inherited DisordersRead next12Cystic Fibrosis and PolydactylyRead next13Sex Determination and ChromosomesRead next14Genetic Diagrams for Sex InheritanceRead next15Variation Types: Genetic and EnvironmentalRead next16Mutations and Their EffectsRead next17Natural Selection MechanismRead next18Survival of the Fittest ConceptRead next19Speciation ProcessRead next20Selective Breeding TechniquesRead next21Risks and Benefits of Selective BreedingRead next22Genetic Engineering OverviewRead next23Uses of Genetic EngineeringRead next24Risks and Ethical Issues of Genetic EngineeringRead next25Cloning Methods in Plants and AnimalsRead next26Advantages and Disadvantages of CloningRead next27Fossil Formation and TypesRead next28Fossils as Evidence for EvolutionRead next29Extinction Causes and ExamplesRead next30Antibiotic Resistance in BacteriaRead next31Development of Resistant StrainsRead next32Classification Systems OverviewRead next33The Linnaean SystemRead next34Three-Domain SystemRead next35Binomial Naming SystemRead next36Evolutionary Relationships Between OrganismsRead next37Evidence Supporting EvolutionRead next38Darwin's Theory of EvolutionRead next39Wallace's Contributions to EvolutionRead next40Genetic Testing for Traits and DisordersRead next41Ethical Issues in Genetic TestingRead next42Human Genome Project OverviewRead next43Applications of Genome ResearchRead next44Examining Genetic Variation in PopulationsRead next45Common Exam Pitfalls in GeneticsRead next46Interpreting Pedigree DiagramsRead next47Using Genetic Data for PredictionsRead next
The Structure of Cells
1The Structure of CellsRead next2Cell Division: MitosisRead next3Cell Division: MeiosisRead next4Fertilisation and Genetic VariationRead next5Photosynthesis: The Essential ReactionRead next6Aerobic Respiration: Energy ReleaseRead next7Anaerobic Respiration: Energy Without OxygenRead next8Metabolism: Building and Breaking MoleculesRead next9Recycling Molecules in EcosystemsRead next10Linking Photosynthesis and RespirationRead next11Why Cells Divide: Growth and RepairRead next12Gametes and Genetic DiversityRead next13Chemical Energy Transfer in CellsRead next14The Role of Enzymes in MetabolismRead next15How Materials Cycle Through the BiosphereRead next16Energy Flow in Living SystemsRead next17The Role of Chlorophyll in PhotosynthesisRead next18Oxygen Production in PhotosynthesisRead next19Carbon Dioxide Use in PhotosynthesisRead next20Cellular Respiration: ATP ProductionRead next21The Importance of Nitrogen in MetabolismRead next22Protein Synthesis in CellsRead next23The Role of Mitochondria in RespirationRead next24The Importance of Water in Cellular ProcessesRead next25The Carbon Cycle and PhotosynthesisRead next26The Oxygen Cycle and RespirationRead next27Energy Transfer Between OrganismsRead next28How Cells Adapt for Efficient FunctioningRead next29The Role of Light in PhotosynthesisRead next30The Role of Glucose in Cellular EnergyRead next31The Role of Starch in Energy StorageRead next32The Role of Lipids in Energy StorageRead next33The Role of Amino Acids in ProteinsRead next34How Organisms Use Energy for MovementRead next35How Organisms Use Energy to Stay WarmRead next36How Organisms Use Energy for GrowthRead next37The Role of Urea in ExcretionRead next38How Enzymes Control Metabolic ReactionsRead next39How Cells Maintain HomeostasisRead next40The Interdependence of Photosynthesis and RespirationRead next41The Role of DNA in Cell DivisionRead next42The Role of Environmental Factors in PhotosynthesisRead next43The Role of Environmental Factors in RespirationRead next44How Molecules Move Between Organisms and the EnvironmentRead next45The Role of ATP in Energy TransferRead next46The Role of Nitrate Ions in Plant GrowthRead next47The Role of Magnesium Ions in Chlorophyll ProductionRead next
Turning questions into testable hypotheses
1Turning questions into testable hypothesesRead next2What all cells have in commonRead next3Levels of organisation: cells to tissues to organs to organ systemsRead next4Pathogens and the idea of infectious diseaseRead next5Photosynthesis word equation and balanced symbol equationRead next6Homeostasis: keeping internal conditions stableRead next7Sexual reproduction: what it involves (animals and flowering plants)Read next8Levels of organisation in ecosystems: organism to ecosystem (AQA)Read next9Required practical 1: microscopy drawings of plant and animal cells (AQA)Read next10Cells, tissues, organs and organ systems work togetherRead next11Choosing independent, dependent and control variablesRead next12Animal cells: key sub-cellular structures and functionsRead next13The digestive system: organs and overall functionRead next14How communicable diseases spread (air, water, contact, vectors)Read next15Photosynthesis as an endothermic reactionRead next16Control systems: receptors, coordination centres and effectorsRead next17Asexual reproduction: what it is and where it happensRead next18Interdependence: why species rely on each otherRead next19Required practical 2: antibiotics/antiseptics and zones of inhibition (AQA, biology only)Read next20Mitosis vs meiosis as the basis of growth and inheritanceRead next21Writing a clear method with repeat measurementsRead next22Plant cells: chloroplasts, vacuole and cellulose cell wallRead next23Digestive enzymes: lock-and-key modelRead next24Reducing disease spread: hygiene and isolation strategiesRead next25Chloroplasts and chlorophyll: what they doRead next26Negative feedback: how homeostasis restores optimum conditionsRead next27Meiosis: halving chromosome number in gametesRead next28Competition: resources organisms compete forRead next29Required practical 3: osmosis in plant tissue using sugar/salt solutions (AQA)Read next30Photosynthesis and respiration as the two key life reactionsRead next31Risk assessment: hazards, risks and control measuresRead next32Bacterial cells: features and plasmidsRead next33Amylase: where it’s made and what it doesRead next34Viral diseases: measles, HIV and tobacco mosaic virusRead next35Limiting factors: light intensityRead next36The nervous system: CNS and neuronesRead next37Fertilisation: restoring the full chromosome numberRead next38Abiotic factors: light, temperature, moisture, soil pH, etc.Read next39Required practical 4: food tests for carbohydrates, lipids and proteins (AQA)Read next40Metabolism as the sum of all chemical reactions in organismsRead next41Precision, accuracy and improving reliabilityRead next42Eukaryotic vs prokaryotic cellsRead next43Proteases: where they’re made and what they doRead next44Bacterial diseases: salmonella and gonorrhoeaRead next45Limiting factors: carbon dioxide concentrationRead next46Reflex actions: why they are rapid and protectiveRead next47Mitosis vs meiosis: identical vs non-identical cellsRead next48Biotic factors: predators, pathogens, food availability, competitionRead next49Required practical 5: effect of pH on amylase (AQA)Read next50Cycling of materials between organisms and the environment (AQA)Read next51Repeatability, reproducibility and spotting anomaliesRead next52Estimating and comparing sizes of sub-cellular structuresRead next53Lipases: where they’re made and what they doRead next54Fungal diseases: rose black spot (plants)Read next55Limiting factors: temperatureRead next56Reflex arc: sensory neurone, synapse, relay neurone, motor neuroneRead next57Advantages and disadvantages of sexual reproduction (biology only)Read next58Adaptations: structural, behavioural and functionalRead next59Required practical 6: light intensity and photosynthesis rate (pondweed) (AQA)Read next60Presenting results in tables with units and headingsRead next61Cell specialisation in animals: sperm, neurones and muscle cellsRead next62Bile: neutralising acid and emulsifying fatsRead next63Protist diseases: malaria and mosquito vectorsRead next64Limiting factors: chlorophyll amountRead next65Synapses: why transmission is one-wayRead next66Advantages and disadvantages of asexual reproduction (biology only)Read next67Communities and stable ecosystemsRead next68Required practical 7: factor affecting human reaction time (AQA)Read next69Plotting graphs with sensible scales and best-fit linesRead next70Cell specialisation in plants: root hair cells, xylem and phloemRead next71Absorption in the small intestineRead next72Non-specific human defences: skin barrierRead next73Interpreting graphs with one limiting factorRead next74Measuring reaction time using data and graphsRead next75DNA, genes, alleles and chromosomes: the basicsRead next76Food chains: producers and consumersRead next77Required practical 8: light/gravity and seedling growth (AQA, biology only)Read next78Interpreting trends, patterns and correlationsRead next79Cell differentiation: what it means and why it mattersRead next80Villi adaptations for absorptionRead next81Non-specific human defences: nose hairs and mucusRead next82Interpreting graphs with 2–3 limiting factors (HT)Read next83Required practical: effect of a factor on human reaction time (AQA)Read next84The genome and phenotype: environment interaction (AQA)Read next85Food webs: interlinked feeding relationshipsRead next86Required practical 9: field sampling to estimate population and distribution (AQA)Read next87Calculating mean, range and percentage changeRead next88Differentiation in animals vs plantsRead next89Required practical: food tests for sugars, starch, protein and lipids (AQA)Read next90Non-specific human defences: trachea/bronchi cilia and mucusRead next91Using the inverse square law for light intensity (HT)Read next92The brain regions: cerebral cortex, cerebellum, medulla (biology only)Read next93Genetic inheritance: genotype vs phenotypeRead next94Trophic levels: numbering and definitions (biology only)Read next95Required practical 10: temperature and milk decay rate via pH (AQA, biology only)Read next96Rate calculations (including practical contexts)Read next97Stem cells: what they are and why they’re usefulRead next98Required practical: effect of pH on amylase (continuous sampling) (AQA)Read next99Non-specific human defences: stomach acidRead next100Greenhouses: balancing cost with limiting factors (HT)Read next101Brain investigation and treatment: difficulties and ethics (HT, biology only)Read next102Monohybrid crosses using Punnett squaresRead next103Pyramids of biomass: constructing from data (biology only)Read next104Using standard form in biology calculationsRead next105Stem cells in medicine: benefits and risks (including ethics)Read next106The circulatory system: what the blood transportsRead next107White blood cells: phagocytosisRead next108Required practical: light intensity on photosynthesis (pondweed) (AQA)Read next109The eye structures: retina, optic nerve, sclera, cornea, irisRead next110Dominant and recessive alleles in inheritance problemsRead next111Transfer of biomass: ~10% to next trophic level (biology only)Read next112Using the microscope: scale bars and magnification basicsRead next113Microscopy: light vs electron microscopesRead next114The heart: structure (atria, ventricles, valves) and functionRead next115White blood cells: antibody productionRead next116Uses of glucose: respirationRead next117Accommodation: focusing on near vs distant objectsRead next118Inherited disorders: polydactyly and cystic fibrosisRead next119Biomass losses: respiration, movement, waste and uneaten materialRead next120Evaluating method limitations and suggesting improvementsRead next121Magnification calculations (image size, real size, magnification)Read next122Blood vessels: arteries, veins and capillariesRead next123White blood cells: antitoxin productionRead next124Uses of glucose: starch storageRead next125Pupils and light intensity: reflex controlRead next126Embryo screening: economic, social and ethical issuesRead next127How materials are cycled: abiotic and biotic componentsRead next128Mitosis: why cells divideRead next129Blood components: plasma, red cells, white cells and plateletsRead next130Vaccination: how it prevents diseaseRead next131Uses of glucose: fats/oils storageRead next132Hormones vs nerves: speed, duration and targetingRead next133Sex determination: XX and XY chromosomesRead next134The water cycle: processes and importanceRead next135The cell cycle and stages of mitosis (overview)Read next136Coronary heart disease: causes and risk factorsRead next137Herd immunity: why vaccinating many people reduces spreadRead next138Uses of glucose: cellulose for cell wallsRead next139Endocrine glands: roles (pituitary, thyroid, adrenals, pancreas, gonads)Read next140Genetic cross for sex inheritanceRead next141The carbon cycle: photosynthesis, respiration, combustion, decompositionRead next142Diffusion: movement down a concentration gradientRead next143Treating CHD: stents and statins (and lifestyle)Read next144Antibiotics: what they treat (and what they don’t)Read next145Uses of glucose: making amino acids with nitrate ionsRead next146Blood glucose control: insulin and glucagonRead next147Variation: genetic vs environmental causesRead next148Decomposition: microorganisms and decay conditions (biology only)Read next149Diffusion rate: surface area, temperature and concentration differenceRead next150The respiratory system: ventilation basicsRead next151Painkillers: symptom relief vs killing pathogensRead next152Respiration as an exothermic reaction in cellsRead next153Diabetes: Type 1 basics and managementRead next154Mutations: what they are and their effectsRead next155Factors affecting decay rate: temperature, water and oxygen (biology only)Read next156Osmosis: movement of water across a partially permeable membraneRead next157Gas exchange in alveoli: adaptations and diffusionRead next158Antibiotic resistance: how resistant strains increaseRead next159Aerobic respiration equation and uses of energyRead next160Type 2 diabetes: risk factors and treatment (HT)Read next161Evolution by natural selection: steps in the processRead next162Anaerobic decay: biogas and methane (links to waste)Read next163Active transport: moving substances against a concentration gradientRead next164Non-communicable disease: examples and risk factorsRead next165Drug discovery: plant/microbe origins and modern synthesisRead next166Anaerobic respiration in muscles: products and energy yieldRead next167Thermoregulation: core temperature and enzymesRead next168Selective breeding: method and impactsRead next169Required practical: temperature and milk decay rate using pH (AQA)Read next170Exchange surfaces: what makes diffusion efficientRead next171Cancer: benign vs malignant tumoursRead next172Preclinical testing: cells, tissues and live animalsRead next173Anaerobic respiration in plants/yeast: fermentation and usesRead next174Skin responses: sweating, vasodilation and vasoconstrictionRead next175Genetic engineering: transferring genes for desired traitsRead next176Impact of environmental change on species distribution (HT, biology only)Read next177Using SA:V ratio to explain diffusion limits in organismsRead next178Plant tissues: epidermis, palisade and spongy mesophyllRead next179Clinical trials: safety, efficacy and dosageRead next180Exercise response: heart rate, breathing rate, breath volumeRead next181Shivering and metabolic heat productionRead next182GM crops: potential benefits and concernsRead next183Biodiversity: what it is and why it supports stabilityRead next184Xylem: structure and functionRead next185Placebos and double-blind trialsRead next186Lactic acid build-up and muscle fatigueRead next187Kidney structure: role of nephrons (overview)Read next188Darwin and Wallace: developing natural selection (biology only)Read next189Measuring biodiversity: counting species in an area (overview)Read next190Phloem: structure and functionRead next191Required practical: zones of inhibition on agar (AQA)Read next192Oxygen debt: what it means and how it’s repaidRead next193Filtering blood: urea, water and ionsRead next194Speciation: how new species form (biology only)Read next195Pollution types: water, air and landRead next196Transpiration: how water moves through a plantRead next197Monoclonal antibodies: how they are made (HT)Read next198Metabolism: definition and why it mattersRead next199Selective reabsorption in the kidney tubulesRead next200Mendel: why his work mattered (and why delayed recognition)Read next201Waste management: reducing, reusing and recycling strategiesRead next202Transpiration rate: light, temperature, humidity and windRead next203Monoclonal antibodies: diagnosis uses (HT)Read next204Building carbohydrates, lipids and proteins from smaller moleculesRead next205Water balance and ADHRead next206Evidence for evolution: fossils and resistant bacteriaRead next207Land use: building, quarrying, farming and landfill impactsRead next208Translocation: moving sugars in the phloemRead next209Monoclonal antibodies: treatment uses (HT)Read next210Making urea from excess proteins (link to excretion)Read next211Kidney failure: dialysis vs transplant (pros and cons)Read next212Fossil formation: why fossils form in some conditionsRead next213Peat bogs: habitat loss and carbon dioxide releaseRead next214Monoclonal antibodies: side effects and ethical issues (HT)Read next215Reproduction hormones: FSH, LH, oestrogen, progesterone (overview)Read next216Extinction: causes and examples of factorsRead next217Deforestation: causes and environmental implicationsRead next218Detecting plant disease by symptoms (HT)Read next219The menstrual cycle: hormone changes across the cycleRead next220Resistant bacteria (including MRSA): selection and spreadRead next221Global warming: greenhouse gases and biological consequencesRead next222Identifying plant disease: lab tests and reference sources (HT)Read next223Contraception: barrier methods and condomsRead next224Classification: Linnaean hierarchy (kingdom to species)Read next225Maintaining biodiversity: conservation programmes and actionsRead next226Plant physical defences (cell walls, cuticle, bark)Read next227Contraception: hormonal methods (pill, implant) and effectsRead next228Binomial naming: genus and speciesRead next229Required practical: sampling and estimating population size (AQA)Read next230Plant chemical defences (antibacterial chemicals and poisons)Read next231Contraception: IUDs and other non-barrier methodsRead next232Using evidence to place organisms into groupsRead next233Food security: what it means (biology only)Read next234Fertility treatment: IVF steps (and success factors)Read next235Factors threatening food security (biology only)Read next236Ethics of fertility treatment and embryo screening (HT)Read next237Farming techniques to improve efficiency (biology only)Read next238Plant hormones: tropisms (phototropism and gravitropism)Read next239Ethical objections to intensive farming (biology only)Read next240Auxin and growth responses in shoots and rootsRead next241Sustainable fisheries: quotas and net sizes (biology only)Read next242Uses of auxins: weedkillers and rooting powderRead next243Biotechnology in food: culturing microorganisms (biology only)Read next244Gibberellins: seed germination and growth effectsRead next245Biotechnology and GM solutions for growing demand (biology only)Read next246Ethene: fruit ripening and commercial controlRead next247Required practical: light/gravity on seedling growth (AQA, biology only)Read next
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