BRAINCAKE

OCR A-level Biology

OCR Biology A (H420)9 topics189 lessons

Free OCR A-level Biology revision for OCR Biology A (H420): 9 topics and 189 short lessons, each with R.E.C.I.P.E. recall steps and a quiz. The topics follow the OCR specification.

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1. Neuronal Communication

38 lessons

  1. Co-ordination
  2. Homeostasis
  3. Cell Signalling
  4. The Nervous System
  5. Neurones
  6. Sensory Neurones
  7. Motor Neurones
  8. Myelinated Neurones
  9. Sensory Receptors
  10. Pacinian Corpuscles
  11. Generator Potential
  12. Resting Potential
  13. Depolarisation
  14. Repolarisation
  15. Hyperpolarisation
  16. The Action Potential
  17. Nerve Impulse
  18. Saltatory Conduction
  19. Synapses
  20. Neurotransmitters
  21. Transmission of Impulse across Synapse
  22. The Role of Synapses
  23. Summation
  24. Structural Organisation of the Nervous System
  25. Functional Organisation of the Nervous System
  26. The Autonomic Nervous System
  27. Comparison of Neurones
  28. The Brain
  29. Structure of the Brain
  30. Cerebrum
  31. Association Areas
  32. Cerebellum
  33. Medulla Oblongata
  34. Hypothalamus
  35. Pituitary Gland
  36. Reflex Actions
  37. Knee-jerk Reflex
  38. Blinking Reflex

2. Muscles

15 lessons

  1. Types of Muscle
  2. Difference in Structure of Different Types of Muscle
  3. Cardiac Muscle
  4. Smooth Muscle
  5. Muscle Fibres
  6. Myofibrils
  7. Actin
  8. Myosin
  9. A Sarcomere
  10. Neuromuscular Junction
  11. Sliding Filament Model
  12. Release of Calcium Ions into the Sarcoplasm
  13. The Power Stroke
  14. The Role of Ca2+ and ATP in Muscle Contraction
  15. Energy Supply during Muscle Contraction

3. Hormonal Communication

11 lessons

  1. Endocrine Glands
  2. Hormones
  3. The Adrenal Glands
  4. Adrenal Cortex
  5. Adrenal Medulla
  6. Pancreas
  7. Blood glucose concentration
  8. Insulin
  9. Glucagon
  10. Mechanism of Insulin Secretion
  11. Diabetes Mellitus

4. Homeostasis

33 lessons

  1. Homeostasis
  2. Feedback Systems
  3. Examples of Positive Feedback
  4. Endotherms and Ectotherms
  5. Behavioural Responses in Ectotherms
  6. Physiological Responses in Ectotherms
  7. Thermoreceptors
  8. The Hypothalamus
  9. Cooling
  10. Warming Up
  11. Excretion
  12. The Liver
  13. Structure of the Liver
  14. Carbohydrate Metabolism in the Liver
  15. Transamination and Deamination
  16. Detoxification
  17. Production of Bile Salts, Bile Pigments and Cholesterol
  18. The Kidneys
  19. Structure of the Kidney
  20. Nephrons
  21. Bowman's Capsule
  22. Glomerulus
  23. Proximal Convoluted Tubule
  24. Loop of Henlé
  25. Countercurrent Multiplier
  26. Ultrafiltration, Selective Reabsorption and Osmoregulation.
  27. Distal Tubule and Collecting Duct
  28. ADH
  29. Kidney failure
  30. Haemodialysis
  31. Peritoneal Dialysis
  32. Pregnancy Testing
  33. Anabolic Steroids

5. Plant Responses

19 lessons

  1. Plant Growth Responses
  2. Plant Hormones
  3. Seed Germination
  4. Apical Dominance
  5. Gibberellins: Synergy and Antagonism.
  6. Leaf Loss
  7. Flowering and Day-Length
  8. Preventing Freezing
  9. Stomatal Control
  10. Chemical Defences
  11. Pheromones
  12. Response to Touch
  13. Tropisms
  14. Growing inthe Dark
  15. Geotropism
  16. Fruit Ripening
  17. Rooting Powder
  18. Hormonal Weedkillers
  19. Other Uses of Plant Hormones

6. Energy for Biological Processes

8 lessons

  1. ATP
  2. Chloroplasts
  3. Photosynthetic pigments
  4. Photosystems
  5. Cyclic Photophosphorylation
  6. Non-cyclic Photophosphorylation
  7. Chemiosmosis
  8. Calvin Cycle

7. Respiration

12 lessons

  1. Energy from Glucose.
  2. Glycolysis
  3. Phosphorylation
  4. Lysis
  5. Substrate Level Phosphorylation
  6. The Link Reaction
  7. The Krebs Cycle.
  8. oxidative phosphorylation
  9. ATP Synthase
  10. Creatine Phosphate
  11. Anaerobic Respiration - Plants and Microorganisms.
  12. Anaerobic Respiration - Mammals

8. Genetics and Variation

36 lessons

  1. The Genetic Code
  2. Mutations
  3. Effects of Mutations
  4. Change in Protein Function
  5. Sickle-cell Anaemia
  6. Causes of mutations
  7. Chromosome Mutations
  8. Gene Regulation
  9. Controlling Transcription
  10. Lac Operon
  11. cyclic AMP
  12. Post-transcriptional control
  13. Translational Control
  14. Post-translational Control
  15. Homeobox Genes
  16. Body Plans
  17. Apoptosis
  18. Regulatory Genes
  19. Variation
  20. Body Mass
  21. Genetic Variation
  22. Continuous and Discontinuous Variation
  23. Genetic Cross
  24. Sex Linkage
  25. Dihybrid Crosses
  26. Linkage
  27. Χ-squared Test
  28. Epistasis
  29. The Hardy-Weinberg Principle
  30. Changes in Allele Frequencies
  31. Population Bottlenecks and The Founder Effect
  32. Types of Selection
  33. Species
  34. Allopatric Speciation
  35. Sympatric Speciation
  36. Artificial Selection

9. Genetic Engineering and Biotechnology

17 lessons

  1. Non-coding DNA
  2. Gel Electrophoresis
  3. DNA Profiling
  4. The Polymerase Chain Reaction
  5. DNA Sequencing
  6. Automated Sequencing
  7. Pathogens, DNA Barcoding
  8. Genomics and Proteomics
  9. Recombinant DNA
  10. Genetic Engineering
  11. Genetically Engineering Different Organisms
  12. Genetically Engineering Plants
  13. Ethical Concerns - microorganisms
  14. GM plants
  15. Patenting
  16. GM animals
  17. Gene Therapy