OCR A-level Biology Revision Notes
OCR 5.1.1 Communication and Homeostasis
The Resting Potential (A-level Biology)
Ectotherms and Endotherms (A-level Biology)
Thermoregulation (A-level Biology)
OCR 6.3.1 Ecosystems
Nitrogen Cycle: Nitrification and Denitrification (A-level Biology)
The Phosphorus Cycle (A-level Biology)
Nitrogen Cycle: Fixation and Ammonification (A-level Biology)
Introduction to Nutrient Cycles (A-level Biology)
Reducing Biomass Loss (A-level Biology)
Sources of Biomass Loss (A-level Biology)
Transfer of Biomass (A-level Biology)
Measuring Biomass (A-level Biology)
Net Primary Production (A-level Biology)
Gross Primary Production (A-level Biology)
OCR 5.2.2 Respiration
Anaerobic Respiration in Mammals, Plants and Fungi (A-level Biology)
Anaerobic Respiration (A-level Biology)
Oxidative Phosphorylation and Chemiosmosis (A-level Biology)
Oxidative Phosphorylation and the Electron Transport Chain (A-level Biology)
The Krebs Cycle (A-level Biology)
The Link Reaction (A-level Biology)
The Stages and Products of Glycolysis (A-level Biology)
Glycolysis (A-level Biology)
The Structure of Mitochondria (A-level Biology)
The Need for Cellular Respiration (A-level Biology)
OCR 5.2.1 Photosynthesis
OCR 5.1.5 Plant and Animal Responses
The Nervous System (A-level Biology)
Sources of ATP During Contraction (A-level Biology)
The Ultrastructure of the Sarcomere During Contraction (A-level Biology)
The Role of Troponin and Tropomyosin (A-level Biology)
The Structure of Myofibrils (A-level Biology)
Slow and Fast Twitch Muscles (A-level Biology)
The Structure of Mammalian Muscles (A-level Biology)
How Muscles Allow Movement (A-level Biology)
The Neuromuscular Junction (A-level Biology)
Controlling Heart Rate (A-level Biology)
OCR 5.1.3 Neuronal Communication
Features of Synapses (A-level Biology)
Inhibitory Synapses (A-level Biology)
Synaptic Transmission (A-level Biology)
The Structure of the Synapse (A-level Biology)
Factors Affecting the Speed of Transmission (A-level Biology)
Myelination (A-level Biology)
The Refractory Period (A-level Biology)
All or Nothing Principle (A-level Biology)
Hyperpolarisation and Transmission of the Action Potential (A-level Biology)
Depolarisation and Repolarisation in the Action Potential (A-level Biology)
OCR 2.1.1 Cell Structure
Magnification and Resolution (A-level Biology)
Calculating Cell Size (A-level Biology)
Studying Cells: Confocal Microscopes (A-level Biology)
Studying Cells: Electron Microscopes (A-level Biology)
Studying Cells: Light Microscopes (A-level Biology)
Structure of Prokaryotic Cells (A-level Biology)
Eukaryotic Cells: Comparing Plant and Animal Cells (A-level Biology)
Eukaryotic Cells: Plant Cell Organelles (A-level Biology)
Eukaryotic Cells: The Endoplasmic Reticulum (A-level Biology)
Eukaryotic Cells: The Golgi Apparatus and Lysosomes (A-level Biology)
OCR 4.2.2 Classification and Evolution
OCR 4.2.1 Biodiversity
OCR 4.1.1 Communicable Diseases
Bacteria, Antibiotics, and Other Medicines (A-level Biology)
Types of Immunity and Vaccinations (A-level Biology)
Structure and Function of Antibodies (A-level Biology)
The Adaptive Immune Response (A-level Biology)
The Innate Immune Response (A-level Biology)
Primary Defences against Pathogens (A-level Biology)
Pathogens and Infectious Diseases (A-level Biology)
Life Cycle and Replication of Viruses (A-level Biology)
Structure of Viruses (A-level Biology)
OCR 3.1.3 Transport in Plants
Translocation and Evidence of the Mass Flow Hypothesis (A-level Biology)
The Phloem (A-level Biology)
Importance of and Evidence for Transpiration (A-level Biology)
Introduction to Transpiration (A-level Biology)
The Pathway and Movement of Water into the Roots and Xylem (A-level Biology)
Examples of Xerophytes (A-level Biology)
Introduction to Xerophytes (A-level Biology)
OCR 3.1.2 Transport in Animals
Structure of The Heart (A-level Biology)
Transport of Carbon Dioxide (A-level Biology)
Transport of Oxygen (A-level Biology)
Exchange in Capillaries (A-level Biology)
Structure and Function of Blood Vessels (A-level Biology)
Understanding Surface Area to Volume Ratio (A-level Biology)
The Need for Exchange Surfaces (A-level Biology)
Microbial Techniques (A-level Biology)
OCR 3.1.1 Exchange Surfaces
OCR 2.1.6 Cell Division, Diversity & Organisation
Chromosome Mutations (A-level Biology)
How Meiosis Produces Variation (A-level Biology)
Cell Division By Meiosis (A-level Biology)
Importance of Meiosis (A-level Biology)
The Xylem (A-level Biology)
Introduction to the Immune System (A-level Biology)
Cell Division: Checkpoints and Mutations (A-level Biology)
Cell Division: Phases of Mitosis (A-level Biology)
Cell Division: The Cell Cycle (A-level Biology)
Cell Division: Chromosomes (A-level Biology)
OCR 2.1.5 Biological Membranes
Transport Across Membranes: Active Transport (A-level Biology)
Investigating Transport Across Membranes (A-level Biology)
Transport Across Membranes: Osmosis (A-level Biology)
Transport Across Membranes: Diffusion (A-level Biology)
Signalling Across Cell Membranes (A-level Biology)
Function of Cell Membrane (A-level Biology)
Factors Affecting Cell Membrane Structure (A-level Biology)
Structure of Cell Membranes (A-level Biology)
OCR 2.1.4 Enzymes
OCR 2.1.3 Nucleotides and Nucleic Acids
The Structure of ATP (A-level Biology)
Transfer RNA (A-level Biology)
Transcription (A-level Biology)
Messenger RNA (A-level Biology)
Features of the Genetic Code (A-level Biology)
Introducing the Genetic Code (A-level Biology)
Genes and Protein Synthesis (A-level Biology)
Synthesising Proteins from DNA (A-level Biology)
Structure of RNA (A-level Biology)
DNA Replication (A-level Biology)
OCR 2.1.2 Biological Molecules
Introduction to Eukaryotic Cells and Organelles (A-level Biology)
Inorganic Ions (A-level Biology)
Properties of Water (A-level Biology)
Structure of Water (A-level Biology)
Test for Lipids and Proteins (A-level Biology)
Tests for Carbohydrates (A-level Biology)
Protein Structures: Globular and Fibrous Proteins (A-level Biology)
Protein Structures: Tertiary and Quaternary Structures (A-level Biology)
Protein Structures: Primary and Secondary Structures (A-level Biology)
Protein Formation (A-level Biology)
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