Your journey to excellence in
By Revision Genie
Biological Molecules
Unit 1
Inorganic Ions in Living Organisms
Water and Its Polarity
Hydrogen Bonds in Water
Water's Surface Tension
Water as a Solvent
Thermal Properties of Water
Water as a Metabolite
Structure of Monosaccharides
Properties of Monosaccharides
Functions of Monosaccharides
Structure of Disaccharides
Properties of Disaccharides
Functions of Disaccharides
Structure of Polysaccharides
Properties of Polysaccharides
Functions of Polysaccharides
Alpha and Beta Glucose Isomerism
Polymerisation of Glucose
Starch as a Storage Compound
Glycogen as a Storage Compound
Cellulose as a Structural Compound
Chitin as a Structural Compound
Structure of Triglycerides
Properties of Triglycerides
Functions of Triglycerides
Structure of Phospholipids
Properties of Phospholipids
Functions of Phospholipids
Saturated vs Unsaturated Fats
Health Implications of Fats
Structure of Amino Acids
Properties of Amino Acids
Functions of Amino Acids
Primary Structure of Proteins
Secondary Structure of Proteins
Tertiary Structure of Proteins
Quaternary Structure of Proteins
Fibrous Proteins and Their Functions
Globular Proteins and Their Functions
Condensation Reactions in Molecules
Hydrolysis Reactions in Molecules
Peptide Bonds in Proteins
Glycosidic Bonds in Carbohydrates
Ester Bonds in Lipids
Food Tests for Starch
Food Tests for Reducing Sugars
Food Tests for Non-Reducing Sugars
Food Tests for Proteins
Food Tests for Fats and Oils
Unit 2
Cell Structure and Organisation
Cell Theory Overview
Structure of Mitochondria
Function of Mitochondria
Structure of Rough Endoplasmic Reticulum
Function of Rough Endoplasmic Reticulum
Structure of Smooth Endoplasmic Reticulum
Function of Smooth Endoplasmic Reticulum
Structure of Ribosomes
Function of Ribosomes
Structure of Golgi Body
Function of Golgi Body
Structure of Lysosomes
Function of Lysosomes
Structure of Centrioles
Function of Centrioles
Structure of Chloroplasts
Function of Chloroplasts
Structure of Vacuoles
Function of Vacuoles
Structure of Nucleus
Function of Nucleus
Chromatin and Its Role
Structure of Nuclear Envelope
Function of Nuclear Envelope
Structure of Nucleolus
Function of Nucleolus
Structure and Function of Plasmodesmata
Prokaryotic Cell Structure
Prokaryotic Cell Features
Structure of Viruses
Cell Theory Development
Differences Between Prokaryotic and Eukaryotic Cells
Comparison of Eukaryotic Animal and Plant Cells
Microscopy Techniques for Cell Ultrastructure
Interpreting Electron Micrographs of Cells
Levels of Biological Organisation
Aggregation of Cells into Tissues
Tissues Forming Organs
Organs Forming Organ Systems
Epithelia Tissue Examples
Muscle Tissue Examples
Connective Tissue Examples
Calibrating a Light Microscope
Calculating Actual Size Using Microscopy
Magnification Calculations in Microscopy
Preparation of Living Cell Slides
Scientific Drawing of Living Cells
Unit 3
Cell Membranes and Transport
The Fluid-Mosaic Model
Components of the Plasma Membrane
Role of Phospholipids in Membranes
Membrane Proteins and Their Functions
Cholesterol and Membrane Stability
Glycoproteins and Glycolipids in Cell Recognition
Factors Affecting Membrane Permeability
Temperature and Membrane Permeability
Solvents and Membrane Permeability
Investigating Beetroot Membrane Permeability
Diffusion: Definition and Mechanism
Factors Affecting Rate of Diffusion
Osmosis and Water Potential
Understanding Solute Potential
Incipient Plasmolysis in Plant Cells
Active Transport and Energy Use
Role of Carrier Proteins in Active Transport
Influence of Cyanide on Active Transport
Facilitated Diffusion and Channel Proteins
Endocytosis: Pinocytosis and Phagocytosis
Exocytosis and Secretion Mechanisms
Examining the Role of ATP in Transport
Determining Water Potential by Mass Change
Determining Solute Potential by Plasmolysis
Investigating Transport Mechanisms in Cells
Surface Area to Volume Ratio in Transport
Common Exam Errors in Membrane Transport
Unit 4
Enzymes and Biological Reactions
Definition of Enzymes
Metabolism and Enzyme Control
Protein Nature of Enzymes
Intracellular vs Extracellular Enzymes
Structure of Active Sites
Induced Fit Theory
Catalysis and Activation Energy
Effect of Temperature on Enzyme Activity
Effect of pH on Enzyme Activity
Substrate Concentration and Enzyme Activity
Enzyme Concentration and Activity
Inactivation and Denaturation of Enzymes
Role of Buffers in Enzyme Activity
Competitive Inhibition
Non-Competitive Inhibition
Immobilised Enzymes
Advantages of Immobilised Enzymes
Industrial Processes Using Enzymes
Lysozyme as an Example of Induced Fit
Graphical Analysis of Enzyme Activity
Rate of Change from Graphs
Using Tangents to Measure Rates
Specified Practical: Temperature Effect on Enzymes
Specified Practical: pH Effect on Enzymes
Specified Practical: Substrate Concentration Effect
Specified Practical: Enzyme Concentration Effect
Importance of Enzymes in Metabolism
Three-Dimensional Structure of Enzymes
Activation Energy and Catalysis
Applications of Enzymes in Food Industry
Applications of Enzymes in Medicine
Applications of Enzymes in Biotechnology
Common Exam Traps in Enzyme Questions
Unit 5
Nucleic Acids and Protein Synthesis
Structure of Nucleotides
Structure of ATP
Role of ATP in Energy Transfer
Structure of DNA
Purines and Pyrimidines in DNA
Complementary Base Pairing
Hydrogen Bonding in DNA
Double Helix and Antiparallel Strands
Structure of RNA
Differences Between DNA and RNA
Functions of DNA: Replication
Semi-Conservative Replication
Role of DNA Polymerase in Replication
Role of DNA Helicase in Replication
Meselson and Stahl Experiment
Functions of DNA: Protein Synthesis
The Genetic Code
Triplet Code for Amino Acids
Exons and Introns in DNA
Transcription Process
Role of Messenger RNA (mRNA)
Translation Process
Role of Ribosomes in Translation
Structure and Function of Transfer RNA (tRNA)
One Gene - One Polypeptide Hypothesis
Polypeptide Modification and Combination
Extraction of DNA from Living Material
Common Exam Traps in DNA Replication
Common Exam Traps in Transcription
Common Exam Traps in Translation
Unit 6
Photosynthesis
Definition of Photosynthesis
Role of Chloroplasts in Photosynthesis
Chloroplast Pigments and Their Functions
Light Absorption by Chlorophyll
Thin Layer Chromatography of Pigments
Photosystems I and II
Energy Transfer in Photosystems
Cyclic Photophosphorylation
Non-Cyclic Photophosphorylation
Photolysis of Water
Formation of ATP via Chemiosmosis
Electron Transport Chain in Photosynthesis
Reduction of NADP in the Stroma
Light-Dependent Reactions Overview
Calvin Cycle: Carbon Fixation
Role of Rubisco Enzyme
Reduction of Glycerate-3-Phosphate
Regeneration of Ribulose Bisphosphate
Formation of Glucose and Other Molecules
Light-Independent Reactions Overview
Role of ATP and Reduced NADP in Calvin Cycle
Limiting Factors in Photosynthesis
Effect of Light Intensity on Photosynthesis
Effect of Carbon Dioxide Concentration
Effect of Temperature on Photosynthesis
Role of Magnesium in Chlorophyll Production
Role of Nitrogen in Plant Growth
Investigating Photosynthesis Rates
Chromatography of Chloroplast Pigments
Practical: Factors Affecting Photosynthesis
Exam Trap: Confusing Light-Dependent and Independent Stages
Exam Trap: Misinterpreting Limiting Factor Graphs
Energy Conversion in Photosynthesis
Comparison of Photosynthesis in Different Plants
Adaptations of Leaves for Photosynthesis
Role of Stomata in Gas Exchange
Environmental Impact on Photosynthesis Efficiency
Photosynthesis in Aquatic Plants
Photosynthesis and Global Carbon Cycle
Unit 7
Respiration
Overview of Respiration
Importance of ATP in Respiration
Glycolysis: Process and Products
Formation of Pyruvate in Glycolysis
Role of NAD in Glycolysis
Link Reaction: Pyruvate to Acetyl CoA
The Krebs Cycle: Overview
Carbon Dioxide Release in Krebs Cycle
Role of NAD and FAD in Krebs Cycle
ATP Production in Krebs Cycle
Oxidative Phosphorylation: Overview
Electron Transport Chain Mechanism
Role of Proton Pumps in Oxidative Phosphorylation
Chemiosmosis and Proton Gradient
ATP Synthase Function
Oxygen as the Final Electron Acceptor
Anaerobic Respiration in Animals
Anaerobic Respiration in Yeast
Energy Yield: Aerobic vs Anaerobic Respiration
Respiration of Lipids
Respiration of Amino Acids
Energy Budget: Glucose Breakdown
Factors Affecting Respiration Rate
Role of Mitochondria in Respiration
Structure of Mitochondria and Adaptations
Practical: Investigating Respiration in Yeast
Exam Trap: Misinterpreting ATP Yield
Exam Trap: Confusing NAD and FAD Roles
Exam Trap: Oxygen's Role in Respiration
Application: Respiration in Exercise
Application: Respiration in Metabolism
Unit 8
Microbiology
Bacterial Shapes and Classification
Gram Stain Technique
Bacterial Cell Wall Structure
Culturing Microorganisms in the Laboratory
Principles of Aseptic Technique
Conditions for Bacterial Growth
Serial Dilutions for Microbial Counting
Plating and Counting Colonies
Viable Count Method
Monitoring Population Growth in Microorganisms
Logarithmic Growth in Bacteria
Interpreting Bacterial Growth Curves
Using Fresh and Stale Milk to Count Bacteria
Preparation of Bacteria for Gram Staining
Observing Bacteria Under the Microscope
Safety in Microbiology Practical Work
Calculating Population Density of Microorganisms
Using ICT to Analyze Microbial Data
Recognizing Correlations in Microbial Growth Data
Common Errors in Microbial Counting Techniques
Examining Stained Bacterial Slides
Understanding Microbial Growth Phases
Factors Affecting Colony Formation
Practical Skills: Serial Dilution and Plating
Mathematical Skills in Microbial Growth Analysis
Using Graphs to Represent Microbial Growth
Risk Assessment in Microbiology Experiments
Applications of Microbial Culturing Techniques
Unit 9
Populations and Ecosystems
Definition of Population
Population Growth Factors
Immigration and Emigration Effects
Birth and Death Rates Impact
Population Growth Graphs
Carrying Capacity Concept
Density-Dependent Factors
Density-Independent Factors
Sampling Techniques for Organisms
Quadrat Sampling Method
Transect Sampling Method
Ecosystem Definition and Scale
Habitat and Community Concepts
Energy Source in Ecosystems
Trophic Levels and Energy Transfer
Gross and Net Production
Pyramids of Biomass
Ecological Succession Overview
Primary Succession Process
Secondary Succession Process
Pioneers and Climax Communities
Organic Breakdown and Nutrient Recycling
Carbon Cycle Overview
Human Impact on the Carbon Cycle
Climate Change Effects on Ecosystems
Nitrogen Cycle Overview
Role of Bacteria in Nitrogen Cycle
Nitrates and Protein Synthesis
Human Activities Affecting Nitrogen Cycle
Ploughing and Drainage Effects
Economic Importance of Nitrogen Cycle
Eutrophication Causes and Effects
Algal Blooms and Habitat Impact
Fieldwork: Abundance of Organisms
Fieldwork: Distribution of Organisms
Predator-Prey Relationships
Computer Modelling in Population Studies
Energy Flow in Ecosystems
Examining Biomass Transfer Efficiency
Human Activities and Ecosystem Balance
Unit 10
Human Impact on the Environment
Causes of Species Endangerment
Causes of Species Extinction
Conservation of Gene Pools in the Wild
Conservation of Gene Pools in Captivity
Deforestation: Causes and Effects
Overfishing: Causes and Solutions
Agricultural Exploitation and Conservation Conflicts
Sustainability and Human Attitudes
Informed Choices for Sustainability
Political Decisions in Environmental Management
Scientific Principles in Environmental Policy
The Concept of Planetary Boundaries
Examples of Planetary Boundaries
Impact of Population Growth on Ecosystems
Human Activities and the Carbon Cycle
Climate Change and Species Distribution
Climate Change and Extinction Risks
The Role of Bacteria in the Nitrogen Cycle
Nitrates in Protein and Nucleic Acid Synthesis
Human Activities in Nitrification
Economic Importance of the Nitrogen Cycle
Eutrophication and Algal Blooms
Drainage Effects on Habitats
Sustainable Management of Biological Resources
Balancing Human Needs and Conservation
Ethical Considerations in Environmental Conservation
Scientific Validation in Environmental Decisions
Biodiversity Loss from Habitat Destruction
Overexploitation of Natural Resources
Pollution and Ecosystem Health
Invasive Species and Ecosystem Impact
The Role of Education in Conservation Efforts
Sustainable Fisheries Management
Reforestation and Afforestation Strategies
The Role of Protected Areas in Conservation
Ecotourism and Conservation Funding
Biodiversity Offsetting in Development Projects
The Precautionary Principle in Environmental Management
Carbon Footprint and Individual Impact
Renewable Energy and Ecosystem Preservation
The Role of NGOs in Conservation
International Agreements on Biodiversity
The Impact of Urbanization on Ecosystems
Sustainable Agriculture Practices
The Role of Technology in Conservation
Monitoring and Restoring Degraded Ecosystems
The Importance of Genetic Diversity
The Role of Zoos in Conservation
Seed Banks and Genetic Preservation
Unit 11
Biodiversity and Classification
What is Biodiversity?
Levels of Biodiversity: Genetic, Species, Ecosystem
Why Biodiversity is Important
Defining a Species
The Binomial Naming System
The Need for Classification
The Five Kingdom Classification System
The Three Domain Classification System
Comparing the Five Kingdoms and Three Domains
Characteristics of Prokaryotae
Characteristics of Protoctista
Characteristics of Plantae
Characteristics of Fungi
Characteristics of Animalia
Using Physical Features for Classification
Using Biochemical Methods for Classification
DNA Fingerprinting in Classification
Enzyme Studies for Evolutionary Relationships
The Tentative Nature of Classification Systems
Natural Selection and Biodiversity
Adaptations: Anatomical, Physiological, Behavioural
Biodiversity Over Time and Spatial Variation
Factors Affecting Biodiversity
Assessing Biodiversity in a Habitat
Using Simpson’s Diversity Index
Assessing Genetic Biodiversity in a Species
Polymorphic Loci and Genetic Diversity
Molecular Techniques for Measuring Biodiversity
Human Impacts on Biodiversity
Practical: Investigating Biodiversity in a Habitat
Examining Biodiversity Case Studies
Conservation Strategies for Biodiversity
Ethical Issues in Biodiversity Conservation
Unit 12
Cell Division
Overview of Cell Division
The Cell Cycle Phases
Interphase and Its Role
Stages of Mitosis
Prophase in Mitosis
Metaphase in Mitosis
Anaphase in Mitosis
Telophase in Mitosis
Cytokinesis in Mitosis
Significance of Mitosis
Mitosis in Growth and Repair
Unrestricted Cell Division and Cancer
Stages of Meiosis
Prophase I in Meiosis
Crossing Over in Meiosis
Metaphase I in Meiosis
Anaphase I in Meiosis
Telophase I and Cytokinesis in Meiosis
Prophase II in Meiosis
Metaphase II in Meiosis
Anaphase II in Meiosis
Telophase II and Cytokinesis in Meiosis
Differences Between Mitosis and Meiosis
Meiosis and Genetic Variation
Significance of Meiosis in Reproduction
Chromosome Behavior in Cell Division
Homologous Chromosomes in Meiosis
Independent Assortment in Meiosis
Scientific Drawing of Mitosis Stages
Scientific Drawing of Meiosis Stages
Practical: Observing Mitosis in Root Tips
Practical: Observing Meiosis in Anthers
Exam Trap: Confusing Mitosis and Meiosis Stages
Role of Cell Division in Multicellular Organisms
Cell Division in Single-Celled Organisms
Chromosomal Errors in Cell Division
Impact of Environmental Factors on Cell Division
Unit 13
Reproduction in Humans
Structure of Male Reproductive System
Structure of Female Reproductive System
Functions of Male Reproductive Organs
Functions of Female Reproductive Organs
Histology of Ovary
Histology of Testis
Spermatogenesis Process
Oogenesis Process
Differences Between Spermatogenesis and Oogenesis
Hormonal Control in Male Reproduction
Hormonal Control in Female Reproduction
The Menstrual Cycle
Role of Follicle Stimulating Hormone
Role of Luteinising Hormone
Role of Oestrogen and Progesterone
Role of Oxytocin in Birth
Role of Prolactin in Lactation
Role of Human Chorionic Gonadotrophin
Fertilisation Process
Implantation of Embryo
Structure and Function of Placenta
Hormonal Role of Placenta
Exchange of Nutrients and Waste via Placenta
Immune Function of Placenta
Common Disorders of the Reproductive System
Examining Hormonal Graphs in Menstrual Cycle
Microscope Skills for Ovary and Testis Histology
Embryonic Development Stages
Role of Sperm Structure in Fertilisation
Role of Egg Structure in Fertilisation
Sexual Intercourse Mechanism
Comparison of Male and Female Gametes
Role of Hormones in Pregnancy Maintenance
Development of Secondary Sexual Characteristics
Role of Hormones in Puberty
Exam Trap: Misinterpreting Hormone Functions
Exam Trap: Confusing Spermatogenesis and Oogenesis
Exam Trap: Placenta Structure vs Function
Exam Trap: Hormonal Graph Analysis Errors
Unit 14
Reproduction in Plants
Structure of Flowering Plants
Generalised Flower Structure
Wind Pollinated Flowers
Insect Pollinated Flowers
Comparison of Wind and Insect Pollination
Development of Pollen in Anthers
Development of Ovules in Ovaries
Microscope Observation of Anther Histology
Microscope Observation of Ovary Histology
Cross-Pollination Mechanism
Self-Pollination Mechanism
Advantages and Disadvantages of Cross-Pollination
Advantages and Disadvantages of Self-Pollination
Double Fertilisation Process
Formation of Seeds
Structure of Seeds in Broad Bean
Structure of Seeds in Maize
Formation of Fruits
Seed Germination Process
Germination of Vicia faba (Broad Bean)
Role of Gibberellin in Germination
Dissection of Wind-Pollinated Flowers
Dissection of Insect-Pollinated Flowers
Scientific Drawing of Anther Slides
Scientific Drawing of Ovary Slides
Calculation of Magnification in Drawings
Investigation into Starch Digestion by Germinating Seeds
Pollination Mechanisms and Adaptations
Environmental Factors Affecting Pollination
Seed Dispersal Mechanisms
Conditions Required for Germination
Role of Water in Germination
Role of Oxygen in Germination
Role of Temperature in Germination
Examining Fruit Types and Their Functions
Reproductive Strategies in Flowering Plants
Common Exam Traps in Plant Reproduction Questions
Unit 15
Inheritance
Introduction to Mendelian Genetics
The Concept of Alleles
Homozygous and Heterozygous Definitions
Dominant and Recessive Traits
Monohybrid Crosses
Punnett Squares for Monohybrid Crosses
Codominance in Genetics
Incomplete Dominance Explained
Dihybrid Crosses
Punnett Squares for Dihybrid Crosses
Linkage in Dihybrid Crosses
Sex Linkage and X-Linked Traits
Examples of Sex-Linked Disorders
Gene Mutations Overview
Point Mutations and Their Effects
Frameshift Mutations Explained
Chromosome Mutations and Disorders
Mutagens and Their Role in Mutation
Carcinogens and Oncogenes
Epigenetics: Introduction
DNA Methylation in Epigenetics
Histone Modification and Gene Expression
Environmental Factors in Epigenetics
Epigenetic Examples in Humans
Chi-Squared Test: Purpose in Genetics
How to Calculate Chi-Squared
Interpreting Chi-Squared Results
Common Errors in Chi-Squared Tests
Examining Sickle Cell Anaemia Mutation
Down Syndrome and Chromosomal Mutation
The Role of Genetic Disorders in Evolution
Ethical Considerations in Genetic Studies
Practical: Gene Segregation Experiment
Practical: Using Chi-Squared in Genetics
Exam Trap: Misinterpreting Genetic Ratios
Exam Trap: Misusing Punnett Squares
Exam Trap: Misunderstanding Epigenetics
Unit 16
Variation and Evolution
Genetic Variation and Its Causes
Environmental Variation in Organisms
Continuous and Discontinuous Variation
Heritable vs Non-Heritable Variation
Inter-Specific Competition Effects
Intra-Specific Competition Effects
Selective Agencies and Survival
Gene Pool and Genetic Drift
Allele Frequency Changes in Populations
Natural Selection Mechanism
Darwin's Theory of Evolution
Isolation Mechanisms in Speciation
Geographical Isolation in Speciation
Behavioral Isolation in Speciation
Morphological Isolation in Speciation
Seasonal Isolation in Speciation
Hybrid Sterility and Speciation
Hardy-Weinberg Principle Introduction
Conditions for Hardy-Weinberg Equilibrium
Hardy-Weinberg Equation Explained
Applying the Hardy-Weinberg Equation
Worked Example: Hardy-Weinberg Calculations
Impact of Human Activity on Selection Pressures
Investigation of Continuous Variation
Using the Student’s t Test in Variation Studies
Analyzing Frequency Tables and Histograms
Understanding Measures of Dispersion
Standard Deviation in Biological Data
Plotting and Interpreting Scatter Diagrams
Statistical Tests in Variation Studies
Ethical Considerations in Evolution Studies
Evaluating Evidence for Speciation
Unit 17
Applications of Genetics
Introduction to Gene Technologies
Principles of Genome Sequencing
The Human Genome Project
The 100K Genome Project
Applications of Genome Sequencing
Sequencing Genomes of Other Organisms
PCR: Polymerase Chain Reaction
Electrophoresis and Genetic Fingerprinting
Forensic Applications of Genetic Fingerprinting
Recombinant DNA Technology
Plasmids and Gene Cloning
Producing Insulin Using Recombinant DNA
Genetically Modified Crops: Disease Resistance
Genetically Modified Crops: Desired Traits
Advantages of GM Crops
Disadvantages of GM Crops
Gene Therapy for Disease Treatment
Applications of Gene Therapy
Challenges in Gene Therapy
Role of Genomics in Future Healthcare
Stem Cells and Tissue Repair
Ethical Issues in Stem Cell Use
Ethical Issues in Genome Sequencing
Screening Embryos for Genetic Disorders
Applications of Screening: Cystic Fibrosis
Applications of Screening: Huntington's Disease
Applications of Screening: Thalassemia
Malaria Control Through Genome Sequencing
Sequencing Anopheles gambiae Genome
Sequencing Plasmodium Genome
Ethical Considerations in GM Crops
Ethical Considerations in Genetic Fingerprinting
Ethical Considerations in Gene Therapy
Scientific Community and Validation of Knowledge
Societal Decision Making in Gene Technologies
Impact of Gene Technologies on Society
Examining the Risks of Gene Technologies
Benefits of Gene Technologies
Common Exam Traps in Gene Technologies
Worked Example: PCR Steps
Worked Example: Genetic Fingerprinting Analysis
Worked Example: Recombinant DNA Process
Worked Example: Ethical Dilemma in Genetics
Diagram: PCR Process
Diagram: Recombinant DNA Formation
Diagram: Genetic Fingerprinting Process
Diagram: Genome Sequencing Workflow
Unit 18
Gas Exchange Adaptations
Surface Area to Volume Ratio
Gas Exchange in Amoeba
Gas Exchange in Flatworm
Gas Exchange in Earthworm
Adaptations of Respiratory Surfaces
Gas Exchange in Fish Gills
Counter-Current Flow in Fish
Parallel Flow in Fish
Human Breathing System Structure
Microscopic Examination of Lung Tissue
Ventilation Mechanisms in Humans
Gas Exchange in Human Lungs
Tracheal System in Insects
Adaptations of Insect Tracheal System
Structure of Angiosperm Leaf
Role of Leaf Structures in Photosynthesis
Leaf as a Gas Exchange Organ
Stomatal Opening and Closing
Investigation of Stomatal Numbers
Dissection of Fish Head for Gas Exchange System
Scientific Drawing of Dicotyledon Leaf
Ventilation Requirements for High Metabolic Rates
Unit 19
Transport Systems in Organisms
Open Circulatory Systems in Insects
Closed Circulatory Systems in Earthworms
Single Circulatory System in Fish
Double Circulatory System in Mammals
Structure and Function of the Human Heart
Main Blood Vessels of the Human Heart
The Cardiac Cycle
Pressure Changes in the Heart
Role of the Sino-Atrial Node
Purkyne Fibres and Heart Activity
Interpreting Electrocardiogram Traces
Transport of Respiratory Gases by Red Blood Cells
Haemoglobin Dissociation Curves
Foetal vs Adult Haemoglobin
Adaptations of Haemoglobin in Low Oxygen Environments
The Bohr Effect in Oxygen Transport
Chloride Shift in CO2 Transport
Formation of Tissue Fluid
Structure of Dicotyledon Roots
Water Absorption by Roots
Apoplast, Symplast, and Vacuolar Pathways
Role of the Endodermis in Roots
Structure of Xylem Tissue
Cohesion-Tension Theory in Water Transport
Structure of Phloem Tissue
Translocation of Organic Materials in Phloem
Experimental Evidence for Phloem Transport
Aphids and Autoradiographs in Phloem Studies
Structure of Dicotyledon Leaves
Environmental Factors Affecting Transpiration
Adaptations of Hydrophytes
Adaptations of Xerophytes
Water Movement from Root to Leaf
Comparison of Xylem and Phloem Functions
Dissection of Mammalian Heart
Scientific Drawing of Artery and Vein Slides
Investigation Using a Potometer
Microscope Examination of Xylem and Phloem
Microscope Examination of Root Cross Sections
Microscope Examination of Leaf Cross Sections
Exam Trap: Misinterpreting Dissociation Curves
Exam Trap: Confusing Xylem and Phloem Functions
Exam Trap: Mislabeling Structures in Heart Diagrams
Exam Trap: Overgeneralizing Plant Adaptations
Unit 20
Nutrition and Digestive Systems
Autotrophic and Heterotrophic Nutrition
Photoautotrophic and Chemoautotrophic Organisms
Saprotrophic Nutrition Mechanism
Holozoic Nutrition Mechanism
Nutrition in Unicellular Organisms (Amoeba)
Simple Gut Adaptations in Hydra
Tube Gut Adaptations in Multicellular Organisms
Human Gut Adaptations for Omnivorous Diet
Microscopic Structure of Duodenum
Microscopic Structure of Ileum
Digestive Enzymes and Their Functions
Conditions for Efficient Enzyme Activity in Digestion
Herbivore Gut Adaptations for Cellulose Digestion
Herbivore Dentition Adaptations
Carnivore Gut Adaptations for Protein Digestion
Carnivore Dentition Adaptations
Observation of Herbivore and Carnivore Skulls
Parasitic Nutrition Mechanism
Adaptations of Tapeworm for Parasitism
Adaptations of Lice for Parasitism
Microscopic Observation of Tapeworm Specimens
Microscopic Observation of Tapeworm Slides
Comparison of Herbivore and Carnivore Digestive Systems
Role of Enzymes in Digestive Processes
Adaptations of Gut Regions for Specific Food Digestion
Human Gut Microbiome and Its Role in Nutrition
Examining the Role of Bile in Fat Digestion
Adaptations of Ruminants for Fermentation Digestion
Common Exam Errors in Digestive System Questions
Application of Nutrition Concepts in Practical Scenarios
Unit 21
Homeostasis and Excretion
Definition of Homeostasis
Importance of Homeostasis
Negative Feedback Mechanisms
Positive Feedback Mechanisms
Role of Receptors and Effectors
Thermoregulation in Humans
Mechanisms of Heat Gain and Loss
Role of the Hypothalamus in Thermoregulation
Osmoregulation and Water Balance
Role of the Kidney in Osmoregulation
Structure of the Kidney
Structure of the Nephron
Ultrafiltration Process
Selective Reabsorption in the Nephron
Role of the Loop of Henle
Countercurrent Multiplier Mechanism
Role of ADH in Water Reabsorption
Control of ADH Release
Urine Formation Process
Excretion and Removal of Urea
Role of the Liver in Excretion
Deamination in the Liver
Formation of Urea in the Liver
Blood and Urine Tests for Kidney Function
Causes of Kidney Failure
Symptoms of Kidney Failure
Dialysis: Principles and Procedure
Advantages and Disadvantages of Dialysis
Kidney Transplantation Process
Advantages and Disadvantages of Kidney Transplants
Ethical Issues in Kidney Treatments
Homeostasis in Other Organisms
Adaptations for Excretion in Different Species
Role of Hormones in Homeostasis
Examining Electron Micrographs of Kidney Tissue
Dissection of a Mammalian Kidney
Exam Trap: Misinterpreting ADH Function
Exam Trap: Confusing Ultrafiltration with Reabsorption
Worked Example: Explaining Negative Feedback
Worked Example: Calculating Water Loss in Urine
Diagram: Structure of the Nephron
Diagram: Countercurrent Multiplier in Loop of Henle
Diagram: Regulation of Body Temperature
Role of Homeostasis in Survival
Impact of Environmental Changes on Homeostasis
Unit 22
The Nervous System
Overview of the Nervous System
Central Nervous System Structure
Peripheral Nervous System Structure
Somatic and Autonomic Nervous Systems
The Role of Sensory Neurons
The Role of Motor Neurons
The Role of Relay Neurons
Structure of a Neuron
Function of the Myelin Sheath
Resting Potential in Neurons
Action Potential in Neurons
Propagation of Nerve Impulses
Synaptic Transmission Overview
Structure of a Synapse
Role of Neurotransmitters
Excitatory and Inhibitory Synapses
Mechanism of Synaptic Transmission
Reuptake and Breakdown of Neurotransmitters
Role of Calcium Ions in Synapses
Effects of Drugs on Synaptic Transmission
The Reflex Arc Overview
Components of a Reflex Arc
The Role of the Spinal Cord in Reflexes
Monosynaptic vs Polysynaptic Reflexes
Examples of Reflex Actions
Voluntary vs Involuntary Responses
The Role of the Brain in Nervous System Control
Cerebrum Structure and Function
Cerebellum Structure and Function
Medulla Oblongata Structure and Function
Hypothalamus and Homeostasis
The Role of the Thalamus
The Role of the Limbic System
Nerve Impulse Speed Factors
Diseases Affecting the Nervous System
Comparison of Nervous and Endocrine Systems
Practical Investigation: Reflex Times
Practical Investigation: Nerve Impulse Speed
Exam Trap: Misinterpreting Synaptic Mechanisms
Exam Trap: Confusion Between Reflex Arc Components
Exam Trap: Mislabeling Brain Structures
Unit 23
Immunology and Disease
Definition of Pathogens
Types of Pathogens
Pathogen Transmission Methods
The Immune System Overview
Role of White Blood Cells
Phagocytosis Process
Antigen Presentation
Role of T Lymphocytes
Role of B Lymphocytes
Antibody Structure and Function
Primary Immune Response
Secondary Immune Response
Active Immunity
Passive Immunity
Vaccines: How They Work
Types of Vaccines
Herd Immunity Concept
Antibiotics: Mechanism of Action
Antibiotic Resistance Causes
Impact of Antibiotic Resistance
Antiviral Drugs and Their Role
Diseases Caused by Bacteria
Diseases Caused by Viruses
Diseases Caused by Fungi
Diseases Caused by Protozoa
Epidemiology Basics
Factors Affecting Disease Spread
Global Impact of Infectious Diseases
Ethical Issues in Vaccination
Immune System Disorders
Autoimmune Diseases Overview
Allergic Reactions Mechanism
Role of Memory Cells in Immunity
Structure and Function of Lymphatic System
Inflammatory Response Process
Role of Cytokines in Immunity
Monoclonal Antibodies Applications
Practical: Investigating Antibody Activity
Practical: Effectiveness of Disinfectants
Practical: Measuring Disease Spread in Populations
Exam Trap: Confusing Active and Passive Immunity
Exam Trap: Misinterpreting Vaccine Data
Exam Trap: Overlooking Antibiotic Resistance Evidence
Unit 24
Human Musculoskeletal Anatomy
Overview of the Musculoskeletal System
Functions of the Musculoskeletal System
Types of Bones in the Human Body
Structure of Long Bones
Bone Tissue: Compact and Spongy
Bone Marrow and Its Role
Bone Growth and Ossification
Types of Joints in the Human Body
Structure of Synovial Joints
Movements at Synovial Joints
Cartilage: Structure and Function
Ligaments: Structure and Function
Tendons: Structure and Function
Overview of Muscles in the Human Body
Types of Muscle Tissue
Skeletal Muscle Structure
Muscle Contraction: Sliding Filament Theory
Role of ATP in Muscle Contraction
Neuromuscular Junctions
Antagonistic Muscle Pairs
Muscle Fatigue and Recovery
Role of Calcium in Muscle Function
The Spine: Structure and Function
The Rib Cage and Its Role
The Pelvis: Structure and Function
The Shoulder Joint: Anatomy and Movements
The Hip Joint: Anatomy and Movements
The Knee Joint: Anatomy and Movements
The Elbow Joint: Anatomy and Movements
The Hand and Wrist Joints
The Foot and Ankle Joints
Musculoskeletal Adaptations for Movement
Bone Remodeling and Repair
Common Musculoskeletal Disorders
Fractures: Types and Healing Process
Arthritis: Types and Effects on Joints
Osteoporosis: Causes and Prevention
Muscle Strains and Ligament Sprains
Role of Exercise in Musculoskeletal Health
Effects of Aging on Musculoskeletal System
Examining X-rays of Bones and Joints
Practical: Dissection of a Chicken Wing
Practical: Observing Muscle Contractions
Practical: Identifying Joints in Models
Exam Trap: Misidentifying Joint Types
Exam Trap: Confusing Ligaments and Tendons
Unit 25
Neurobiology and Behaviour
Structure of the Brain
Function of the Cerebrum
Function of the Cerebellum
Function of the Medulla Oblongata
Function of the Hypothalamus
Function of the Pituitary Gland
Role of the Limbic System
Neurons and Their Structure
Types of Neurons
The Synapse and Neurotransmitters
Action Potential Mechanism
Role of Myelin Sheath
Reflex Arcs and Their Function
The Autonomic Nervous System
Sympathetic vs Parasympathetic Systems
The Role of Sensory Receptors
Integration of Neural Pathways
The Biological Basis of Behavior
The Role of the Prefrontal Cortex in Decision Making
The Role of the Amygdala in Emotions
The Role of the Hippocampus in Memory
The Role of Dopamine in Reward Systems
The Role of Serotonin in Mood Regulation
Impact of Neurotransmitter Imbalances
The Effect of Drugs on the Nervous System
Neuroplasticity and Learning
The Role of the Endocrine System in Behavior
The Interaction Between Nervous and Endocrine Systems
Stress Response: HPA Axis
The Role of Adrenaline and Cortisol
Sleep and Its Neural Regulation
Circadian Rhythms and the Brain
The Role of the Reticular Activating System
The Biological Basis of Mental Health Disorders
Parkinson’s Disease: Neural Basis
Alzheimer’s Disease: Neural Basis
Schizophrenia: Neural Basis
Depression: Neural Basis
The Role of Genetics in Behavior
The Role of Environment in Shaping Neural Pathways
Techniques for Studying Brain Activity
MRI and fMRI in Neurobiology
EEG in Studying Neural Activity
PET Scans in Brain Research
The Ethical Issues in Neurobiology Research
The Role of Animal Models in Neurobiology
Examining Human Brain Disorders Using Neurobiology
Biology
