Library
AP Biology
Got a question wrong? Open the notes for that topic.
Teaching this subject? Everything for the classroom in one place →
- Course & Exam Description
- Revision Sheet
- Syllabus Checklist
- Scheme of Work
- Exam Technique
- Command Words — A3 poster
- Lesson Plans — one page per topic
- Class Mark Book
1. Chemistry of Life 22 files
2. Cell Structure and Function 32 files
3. Cellular Energetics 20 files
4. Cell Communication and Cell Cycle 23 files
5. Heredity 20 files
6. Gene Expression and Regulation 28 files
7. Natural Selection 39 files
- 7.1 Introduction to Natural Selection
- 7.2 Natural Selection
- 7.3 Artificial Selection
- 7.4 Population Genetics
- 7.5 Hardy-Weinberg Equilibrium
- 7.6 Evidence of Evolution
- 7.7 Common Ancestry
- 7.8 Continuing Evolution
- 7.9 Phylogeny
- 7.10 Speciation
- 7.11 Variations in Populations
- 7.12 Origins of Life on Earth
- 7.1 Introduction to Natural Selection
- 7.2 Natural Selection
- 7.3 Artificial Selection
- 7.4 Population Genetics
- 7.5 Hardy-Weinberg Equilibrium
- 7.6 Evidence of Evolution
- 7.7 Common Ancestry
- 7.8 Continuing Evolution
- 7.9 Phylogeny
- 7.10 Speciation
- 7.11 Variations in Populations
- 7.12 Origins of Life on Earth
8. Ecology 26 files
2026 1 files
- 2026 Questions
- AP Biology — Question index
- 1.4 Carbohydrates
- 1.6 Nucleic Acids
- 1.7 Proteins
- 2.3 Plasma Membrane
- 2.4 Membrane Permeability
- 2.6 Facilitated Diffusion
- 2.7 Tonicity and Osmoregulation
- 2.8 Mechanisms of Transport
- 2.9 Cell Compartmentalization
- 2.10 Origins of Cell Compartmentalization
- 3.1 Enzymes
- 3.2 Environmental Impacts on Enzyme Function
- 3.3 Cellular Energy
- 3.4 Photosynthesis
- 3.5 Cellular Respiration
- 4.1 Cell Communication
- 4.2 Introduction to Signal Transduction
- 4.3 Signal Transduction Pathways
- 4.4 Feedback
- 4.5 Cell Cycle
- 4.6 Regulation of Cell Cycle
- 5.1 Meiosis
- 5.2 Meiosis and Genetic Diversity
- 5.3 Mendelian Genetics
- 5.4 Non-Mendelian Genetics
- 5.5 Environmental Effects on Phenotype
- 6.1 DNA and RNA Structure
- 6.3 Transcription and RNA Processing
- 6.4 Translation
- 6.5 Regulation of Gene Expression
- 6.6 Gene Expression and Cell Specialization
- 6.7 Mutations
- 6.8 Biotechnology
- 7.1 Introduction to Natural Selection
- 7.2 Natural Selection
- 7.3 Artificial Selection
- 7.4 Population Genetics
- 7.6 Evidence of Evolution
- 7.7 Common Ancestry
- 7.9 Phylogeny
- 7.10 Speciation
- 7.11 Variations in Populations
- 7.12 Origins of Life on Earth
- 8.1 Responses to the Environment
- 8.2 Energy Flow Through Ecosystems
- 8.3 Population Ecology
- 8.4 Effect of Density on Populations
- 8.5 Community Ecology
- 8.6 Biodiversity
- 8.7 Disruptions in Ecosystems
Topic quizzes
- 1. Chemistry of Life
- 2. Cell Structure and Function
- 3. Cellular Energetics
- 4. Cell Communication and Cell Cycle
- 5. Heredity
- 6. Gene Expression and Regulation
- 7. Natural Selection
- 8. Ecology
Unit tests
- 1. Chemistry of Life
- 2. Cell Structure and Function
- 3. Cellular Energetics
- 4. Cell Communication and Cell Cycle
- 5. Heredity
- 6. Gene Expression and Regulation
- 7. Natural Selection
- 8. Ecology
Mock papers
Course companion
Glossary
Topic handouts
- 1.1 Structure of Water and Hydrogen Bonding
- 1.2 Elements of Life
- 1.3 Introduction to Macromolecules
- 1.4 Carbohydrates
- 1.5 Lipids
- 1.6 Nucleic Acids
- 1.7 Proteins
- 2.1 Cell Structure and Function
- 2.2 Cell Size
- 2.3 Plasma Membrane
- 2.4 Membrane Permeability
- 2.5 Membrane Transport
- 2.6 Facilitated Diffusion
- 2.7 Tonicity and Osmoregulation
- 2.8 Mechanisms of Transport
- 2.9 Cell Compartmentalization
- 2.10 Origins of Cell Compartmentalization
- 3.1 Enzymes
- 3.2 Environmental Impacts on Enzyme Function
- 3.3 Cellular Energy
- 3.4 Photosynthesis
- 3.5 Cellular Respiration
- 4.1 Cell Communication
- 4.2 Introduction to Signal Transduction
- 4.3 Signal Transduction Pathways
- 4.4 Feedback
- 4.5 Cell Cycle
- 4.6 Regulation of Cell Cycle
- 5.1 Meiosis
- 5.2 Meiosis and Genetic Diversity
- 5.3 Mendelian Genetics
- 5.4 Non-Mendelian Genetics
- 5.5 Environmental Effects on Phenotype
- 6.1 DNA and RNA Structure
- 6.2 DNA Replication
- 6.3 Transcription and RNA Processing
- 6.4 Translation
- 6.5 Regulation of Gene Expression
- 6.6 Gene Expression and Cell Specialization
- 6.7 Mutations
- 6.8 Biotechnology
- 7.1 Introduction to Natural Selection
- 7.2 Natural Selection
- 7.3 Artificial Selection
- 7.4 Population Genetics
- 7.5 Hardy-Weinberg Equilibrium
- 7.6 Evidence of Evolution
- 7.7 Common Ancestry
- 7.8 Continuing Evolution
- 7.9 Phylogeny
- 7.10 Speciation
- 7.11 Variations in Populations
- 7.12 Origins of Life on Earth
- 8.1 Responses to the Environment
- 8.2 Energy Flow Through Ecosystems
- 8.3 Population Ecology
- 8.4 Effect of Density on Populations
- 8.5 Community Ecology
- 8.6 Biodiversity
- 8.7 Disruptions in Ecosystems
Lesson slides
- 1. Chemistry of Life
- 2. Cell Structure and Function
- 3. Cellular Energetics
- 4. Cell Communication and Cell Cycle
- 5. Heredity
- 6. Gene Expression and Regulation
- 7. Natural Selection
- 8. Ecology
Lesson slides
- 1.1 Structure of Water and Hydrogen Bonding
- 1.2 Elements of Life
- 1.3 Introduction to Macromolecules
- 1.4 Carbohydrates
- 1.5 Lipids
- 1.6 Nucleic Acids
- 1.7 Proteins
- 2.1 Cell Structure and Function
- 2.2 Cell Size
- 2.3 Plasma Membrane
- 2.4 Membrane Permeability
- 2.5 Membrane Transport
- 2.6 Facilitated Diffusion
- 2.7 Tonicity and Osmoregulation
- 2.8 Mechanisms of Transport
- 2.9 Cell Compartmentalization
- 2.10 Origins of Cell Compartmentalization
- 3.1 Enzymes
- 3.2 Environmental Impacts on Enzyme Function
- 3.3 Cellular Energy
- 3.4 Photosynthesis
- 3.5 Cellular Respiration
- 4.1 Cell Communication
- 4.2 Introduction to Signal Transduction
- 4.3 Signal Transduction Pathways
- 4.4 Feedback
- 4.5 Cell Cycle
- 4.6 Regulation of Cell Cycle
- 5.1 Meiosis
- 5.2 Meiosis and Genetic Diversity
- 5.3 Mendelian Genetics
- 5.4 Non-Mendelian Genetics
- 5.5 Environmental Effects on Phenotype
- 6.1 DNA and RNA Structure
- 6.2 DNA Replication
- 6.3 Transcription and RNA Processing
- 6.4 Translation
- 6.5 Regulation of Gene Expression
- 6.6 Gene Expression and Cell Specialization
- 6.7 Mutations
- 6.8 Biotechnology
- 7.1 Introduction to Natural Selection
- 7.2 Natural Selection
- 7.3 Artificial Selection
- 7.4 Population Genetics
- 7.5 Hardy-Weinberg Equilibrium
- 7.6 Evidence of Evolution
- 7.7 Common Ancestry
- 7.8 Continuing Evolution
- 7.9 Phylogeny
- 7.10 Speciation
- 7.11 Variations in Populations
- 7.12 Origins of Life on Earth
- 8.1 Responses to the Environment
- 8.2 Energy Flow Through Ecosystems
- 8.3 Population Ecology
- 8.4 Effect of Density on Populations
- 8.5 Community Ecology
- 8.6 Biodiversity
- 8.7 Disruptions in Ecosystems
Vocabulary lists
- 1. Chemistry of Life
- 2. Cell Structure and Function
- 3. Cellular Energetics
- 4. Cell Communication and Cell Cycle
- 5. Heredity
- 6. Gene Expression and Regulation
- 7. Natural Selection
- 8. Ecology
Flashcards
Weekly vocab tests
- Week 1 · Topic 1 · Chemistry of Life
- Week 2 · Topic 2 · Cell Structure and Function
- Week 3 · Topics 2–4 · Cell Structure and Function, Cellular Energetics, Cell Communication and Cell Cycle
- Week 4 · Topics 4–5 · Cell Communication and Cell Cycle, Heredity
- Week 5 · Topics 5–6 · Heredity, Gene Expression and Regulation
- Week 6 · Topics 6–7 · Gene Expression and Regulation, Natural Selection
- Week 7 · Topics 7–8 · Natural Selection, Ecology
Weekly homework
Exercise sheets
- Complete pack — exercise sheets + past papers
- 1 Chemistry of Life — Part 1
- 1 Chemistry of Life — Part 2
- 2 Cell Structure and Function — Part 1
- 2 Cell Structure and Function — Part 2
- 3 Cellular Energetics — Part 1
- 3 Cellular Energetics — Part 2
- 4 Cell Communication and Cell Cycle — Part 1
- 4 Cell Communication and Cell Cycle — Part 2
- 5 Heredity — Part 1
- 5 Heredity — Part 2
- 6 Gene Expression and Regulation — Part 1
- 6 Gene Expression and Regulation — Part 2
- 7 Natural Selection — Part 1
- 7 Natural Selection — Part 2
- 8 Ecology — Part 1
- 8 Ecology — Part 2
Past papers
- 1.4 Carbohydrates
- 1.6 Nucleic Acids
- 1.7 Proteins
- 2.3 Plasma Membrane
- 2.4 Membrane Permeability
- 2.6 Facilitated Diffusion
- 2.7 Tonicity and Osmoregulation
- 2.8 Mechanisms of Transport
- 2.9 Cell Compartmentalization
- 2.10 Origins of Cell Compartmentalization
- 3.1 Enzymes
- 3.2 Environmental Impacts on Enzyme Function
- 3.3 Cellular Energy
- 3.4 Photosynthesis
- 3.5 Cellular Respiration
- 4.1 Cell Communication
- 4.2 Introduction to Signal Transduction
- 4.3 Signal Transduction Pathways
- 4.4 Feedback
- 4.5 Cell Cycle
- 4.6 Regulation of Cell Cycle
- 5.1 Meiosis
- 5.2 Meiosis and Genetic Diversity
- 5.3 Mendelian Genetics
- 5.4 Non-Mendelian Genetics
- 5.5 Environmental Effects on Phenotype
- 6.1 DNA and RNA Structure
- 6.3 Transcription and RNA Processing
- 6.4 Translation
- 6.5 Regulation of Gene Expression
- 6.6 Gene Expression and Cell Specialization
- 6.7 Mutations
- 6.8 Biotechnology
- 7.1 Introduction to Natural Selection
- 7.2 Natural Selection
- 7.3 Artificial Selection
- 7.4 Population Genetics
- 7.6 Evidence of Evolution
- 7.7 Common Ancestry
- 7.9 Phylogeny
- 7.10 Speciation
- 7.11 Variations in Populations
- 7.12 Origins of Life on Earth
- 8.1 Responses to the Environment
- 8.2 Energy Flow Through Ecosystems
- 8.3 Population Ecology
- 8.4 Effect of Density on Populations
- 8.5 Community Ecology
- 8.6 Biodiversity
- 8.7 Disruptions in Ecosystems
Tips
Practise the data-analysis questions first. They are the most transferable part of the paper: the skill you build on one graph works on the next, whatever the organism.
Answer in the required form. A prompt that says "describe" wants what happens; "explain" wants why; "justify" wants evidence from the data given. Confusing the three is the commonest avoidable loss on this paper.
Older released papers use the previous unit numbering but the science practices they test are unchanged — they are still good practice for exactly the skills that decide the grade.