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Edexcel AS-level Biology

Edexcel Biology (8BI0)17 topics368 lessons

Free Edexcel AS-level Biology revision for Edexcel Biology (8BI0): 17 topics and 368 short lessons, each with R.E.C.I.P.E. recall steps and a quiz. The topics follow the Edexcel specification.

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1. Chemistry for Life

10 lessons

  1. Ionic Bonding
  2. Covalent Bonding
  3. Important Anions
  4. Important Cations
  5. Water
  6. Water as a Polar Solvent
  7. Water as a Transport Medium
  8. Water as a Habitat
  9. Water in Plant Transport Systems
  10. Water in Hydraulic Mechanisms

2. Biological Molecules

25 lessons

  1. Organic Compounds
  2. Carbohydrates
  3. Monosaccharides
  4. Disaccharides
  5. Test for Sugars
  6. Polysaccharides
  7. Starch
  8. Test for Starch
  9. Glycogen
  10. Cellulose
  11. The Nature of Lipids
  12. Fatty Acids and Glycerol
  13. Triglycerides
  14. Phospholipids
  15. Unit Membrane
  16. Test for Lipids
  17. Amino-acids
  18. Hydrogen Bonding
  19. Disulfide Bridges
  20. Ionic Bonds
  21. Protein Structure
  22. Globular Proteins
  23. Fibrous Proteins
  24. Collagen
  25. Conjugated Proteins

3. DNA, Genes and Protein Synthesis

20 lessons

  1. Nucleotides
  2. ATP
  3. Nucleic Acids
  4. Phosphodiester Bonds
  5. Complementary Base Pairing
  6. Evidence for Semi-Conservative DNA Replication
  7. DNA Replication
  8. The Genetic Code
  9. Types of RNA
  10. mRNA
  11. tRNA
  12. rRNA
  13. Protein Synthesis
  14. Transcription
  15. Translation
  16. Polysomes
  17. Mutations
  18. Gene Mutation
  19. Sickle Cell Disease
  20. Chromosome Mutations

4. Enzymes

14 lessons

  1. Enzymes
  2. Extra-Cellular and Intracellular Enzymes
  3. Biological Catalysts
  4. Lock and Key Hypothesis
  5. Induced Fit Hypothesis
  6. Measuring Rate of Reaction
  7. Effect of Substrate Concentration
  8. Effect of Temperature
  9. Effect of pH
  10. Effect of Enzyme Concentration
  11. Reversible and Irreversible Inhibition
  12. Competitive Inhibition
  13. Non-competitive Inhibition
  14. End-Product Inhibition

5. Eukaryotic Cells

30 lessons

  1. Magnification and Resolution
  2. Light Microscope
  3. Electron Microscope
  4. Transmission Electron Microscope
  5. Scanning Electron Microscope
  6. Ultrastructure
  7. Membranes
  8. Phospholipid Bilayer
  9. Membrane Proteins
  10. Fluid Mosaic Model
  11. Eukaryotic Cells
  12. Protoplasm
  13. The Nucleus
  14. Mitochondria
  15. Centrioles
  16. Cytoskeleton
  17. Vacuoles
  18. Ribosomes
  19. Rough ER
  20. Smooth ER
  21. Golgi Apparatus
  22. Lysosomes
  23. Plant Cells
  24. Plant Cell Walls
  25. Plasmodesmata
  26. Permanent Vacuole
  27. Chloroplasts
  28. Organisation of Cells
  29. Epithelial Cells
  30. Organ Systems

6. Prokaryotic Cells

31 lessons

  1. Bacterial Cell
  2. Pili and Flagella
  3. Cell Surface Membrane
  4. Plasmids
  5. Nucleoid
  6. 70S Ribosomes
  7. Gram-Staining
  8. Antibiotics
  9. Alternative Classification of Bacteria
  10. Viruses
  11. The Structure of Viruses
  12. DNA Viruses
  13. RNA Viruses
  14. RNA Retroviruses
  15. Viral Reproduction
  16. Virus Life Cycle
  17. DNA Virus Latency
  18. DNA Virus Lytic Pathway
  19. RNA Virus Replication
  20. Positive ssRNA Viruses
  21. Negative ssRNA Viruses
  22. Retrovirus Replication
  23. Viruses and Disease
  24. The Spread of Viral Diseases
  25. Treating Viral Diseases
  26. Preventing Viral Diseases
  27. Vaccination
  28. Disease Control
  29. Drug Development
  30. Pandemics
  31. Ethics

7. The Cell Cycle

18 lessons

  1. Chromosomes
  2. The Cell Cycle
  3. Control of the Cell Cycle
  4. Mitosis
  5. Prophase
  6. Metaphase
  7. Anaphase
  8. Telophase
  9. Cytokinesis
  10. Asexual Reproduction
  11. Sporulation
  12. Regeneration
  13. Budding
  14. Vegetative Propagation
  15. Mitosis and Growth and Repair
  16. Measuring Growth
  17. Growth Patterns
  18. Growth in Plants

8. Meiosis and Sexual Reproduction

28 lessons

  1. Sexual Reproduction
  2. Gametes
  3. Formation of Gametes
  4. Meiosis
  5. Prophase 1
  6. Metaphase 1
  7. Anaphase 1
  8. Telophase 1
  9. Meiosis 2
  10. The Importance of Meiosis
  11. Chromosome Mutation
  12. Non-disjunction
  13. Down's Syndrome
  14. Turner's Syndrome
  15. Spermatogenesis
  16. Oogenesis
  17. The Male Gamete
  18. The Female Gamete
  19. Gametogenesis in Plants
  20. Formation of Pollen
  21. Formation of Plant Egg Cells
  22. Pollination
  23. Internal Fertilisation
  24. External Fertilisation
  25. Fertilisation in Humans
  26. Fertilisation in Plants
  27. Embryo Development in Mammals
  28. Differentiation

9. Classification

19 lessons

  1. Biodiversity
  2. Classification
  3. Taxonomy
  4. Taxonomic Groups
  5. Binomial System
  6. Species
  7. Morphological Concept of Species
  8. Biological Concept of Species
  9. Other Species Models
  10. Limitations of Species Models
  11. Identifying a Species
  12. DNA Barcode
  13. DNA Analysis and Proteomics
  14. New Evolutionary Models
  15. Biochemical Relationships
  16. More Biochemical Relationships
  17. Gel Electrophoresis
  18. Domains
  19. Kingdoms

10. Natural Selection

29 lessons

  1. The Theory of Evolution
  2. Neo-Darwinism
  3. Adaptation
  4. Anatomical Adaptation
  5. Physiological Adaptation
  6. Behavioural Adaptation
  7. Grayling Butterflies
  8. Fungal Carnivores
  9. The Same Species in Different Environments
  10. Natural Selection
  11. Natural Selection in Oysters
  12. Natural Selection in Moths
  13. Reproductive Success
  14. Directional Selection
  15. Antibiotics
  16. Antibiotic Resistance
  17. Preventing Antibiotic Resistance
  18. Speciation
  19. Types of Isolation
  20. Allopatric Speciation
  21. Endemic Species
  22. Desert Pupfish
  23. Adaptive Radiation
  24. Sympatric Speciation
  25. Howea Palm Tree
  26. Fruit Fly Rhagoletis pomonella
  27. Cichlid Fish
  28. Cichlid Speciation
  29. Cichlids Under Threat

11. Biodiversity

22 lessons

  1. Biodiversity
  2. The Importance of Biodiversity
  3. Species Richness
  4. Endemic Species
  5. Species Abundance
  6. Index of Diversity
  7. Biodiversity of Different Habitats
  8. Changing Biodiversity
  9. Allele Frequency
  10. Measuring Genetic Biodiversity
  11. Hawaii
  12. Ethical Argument for Biodiversity
  13. Ecosystem Services
  14. Conserving Ecosystems
  15. Conservation
  16. Ex-Situ Conservation of Plants
  17. Ex-situ Conservation of Animals
  18. In-Situ Conservation
  19. In-situ Conservation Strategies
  20. National Parks
  21. Conflicts with Conservation
  22. Sustainability

12. Cell Transport Mechanisms

18 lessons

  1. The Need for Transport
  2. Transport Across the Cell Membrane
  3. Passive and Active Transport
  4. Diffusion
  5. Facilitated Diffusion
  6. Water Potential ψ
  7. Osmosis
  8. Modelling Osmosis
  9. Osmotic Concentrations
  10. Osmosis in Animal Cells
  11. Water Potential in Plant Cells
  12. Osmosis in Plant Cells
  13. Turgor Pressure (P)
  14. Osmotic Potential (π)
  15. Water Potential, Turgor Pressure and Osmotic Potential
  16. Active Transport
  17. Evidence for Active Transport
  18. Endocytosis and Exocytosis

13. Gas Exchange

23 lessons

  1. Gas Exchange in Small Organisms
  2. Surface Area to Volume Ratio
  3. Gas Exchange in Large Organisms
  4. Factors Affecting the Rate of Diffusion
  5. Effective Gas Exchange Systems
  6. The Human Gas Exchange System
  7. Gas Exchange in the Alveoli
  8. Adaptations of the Human Gas Exchange System
  9. Breathing
  10. Inhalation
  11. Exhalation
  12. Protecting the Lungs
  13. Gas Exchange in Insects
  14. The Tracheal System
  15. Very Active Insects
  16. Gas Exchange in Fish
  17. Fish Gills
  18. Ventilating the Gills
  19. The Countercurrent Exchange System
  20. Gas Exchange in Plants
  21. Stomata
  22. Opening and Closing the Stomata
  23. Lenticels

14. Circulatory Systems

33 lessons

  1. The Need for Transport Systems
  2. Features of a Mass Transport System
  3. Circulation Systems
  4. Single Circulation System
  5. Double Circulation System
  6. Cardiovascular System
  7. Components of Blood
  8. Plasma
  9. Erythrocytes
  10. Leucocytes
  11. Granulocytes
  12. Agranulocytes
  13. Platelets
  14. Haemoglobin and Oxygen Transport
  15. Oxygen Dissociation Curve for Haemoglobin
  16. The Bohr Effect
  17. Fetal Haemoglobin
  18. Myoglobin
  19. Transport of Carbon Dioxide
  20. Blood Clotting
  21. The Blood Clotting Cascade
  22. Blood Vessels
  23. Arteries
  24. Arterioles
  25. Capillaries
  26. Veins and venules
  27. Tissue Fluid
  28. Oncotic Pressure
  29. Hydrostatic Pressure
  30. Arterial End of Capillaries
  31. Venous End of Capillaries
  32. Formation of Lymph
  33. Lymph Nodes

15. The Heart

7 lessons

  1. Structure of the Human Heart
  2. Blood Flow through the Heart
  3. Contraction of Cardiac Muscle
  4. The Cardiac Cycle
  5. Control of the Heartbeat
  6. Electrocardiograms
  7. Electrical and Pressure Changes in the Heart

16. Cardiovascular Diseases

20 lessons

  1. Cardiovascular Diseases in the UK
  2. Atherosclerosis
  3. Aneurysms
  4. Raised Blood Pressure
  5. Heart Disease
  6. Angina
  7. Thrombosis
  8. Heart Attacks
  9. Strokes
  10. Epidemiology
  11. Risk
  12. Non-modifiable Risk Factors
  13. Modifiable Risk Factors
  14. Smoking and Atherosclerosis
  15. Exercise and Atherosclerosis
  16. Weight and Atherosclerosis
  17. Stress and Atherosclerosis
  18. Diet and Atherosclerosis
  19. Links Between Factors, Correlation and Causation
  20. Preventing Atherosclerosis

17. Transport in Plants

21 lessons

  1. Xylem and Phloem
  2. Xylem
  3. Evidence for the Movement of Water Through Xylem
  4. Phloem
  5. Root Hair Cells
  6. Symplast Pathway
  7. Apoplast Pathway
  8. Transpiration
  9. Cohesion-Tension Theory
  10. Adhesion and Capillarity
  11. Modelling Transpiration
  12. Measuring the Rate of Water Uptake
  13. Factors Affecting Transpiration
  14. Root Pressure
  15. Translocation in the Phloem
  16. Phloem Loading
  17. The Symplast Pathway
  18. The Apoplast Pathway
  19. Phloem Unloading
  20. Mass Flow Hypothesis
  21. Pressure Flow Hypothesis