AP Biology

Tips

AP Biology is built on four big ideas: evolution, energetics, information storage and transmission, and systems interactions. Its content is huge, but the exam does not test recall of it. It tests whether you can use biology on an unfamiliar case — a species you have never met, an experiment you have never seen.

The science practices are the real syllabus: reading a graph, designing an experiment, identifying the control, and justifying a claim with evidence. These are exactly what the free-response section asks for.

Statistics is examinable. Chi-square, standard error and error bars appear regularly, and they carry marks that pure content revision never reaches.

Notes run through all eight units, with diagrams for the processes that are easier seen than read. The library holds released free-response questions; the biology rubric pays for linking structure to function and for handling data correctly, so the worked answers are built that way.

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Past Papers

1
Chemistry of Life
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- 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
- 1.7 Practice
- 1.7 Answers
- 1.7 Exam tips
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2
Cell Structure and Function
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- 2.1 Organelles and the Endomembrane System
- 2.2 Why Cells Stay Small
- 2.3 The Fluid Mosaic Model of the Membrane
- 2.4 What Can Cross the Membrane
- 2.5 Passive and Active Transport
- 2.6 Facilitated Diffusion
- 2.7 Tonicity, Water Potential, and Osmoregulation
- 2.8 Mechanisms of Membrane Transport
- 2.9 Compartmentalization Inside the Cell
- 2.10 The Origins of Cell Compartmentalization
- 2.10 Exam tips
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3
Cellular Energetics
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- 3.1 Enzymes as Biological Catalysts
- 3.2 Environmental Impacts on Enzyme Function
- 3.3 Cellular Energy and ATP
- 3.4 Photosynthesis
- 3.5 Cellular Respiration
- 3.5 Exam tips
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4
Cell Communication and Cell Cycle
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- 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
- 4.6 Practice
- 4.6 Answers
- 4.6 Exam tips
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5
Heredity
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- 5.1 Meiosis
- 5.2 Meiosis and Genetic Diversity
- 5.3 Mendelian Genetics
- 5.4 Non-Mendelian Genetics
- 5.4 Linked genes and recombination
- 5.4 Reading a pedigree
- 5.5 Environmental Effects on Phenotype
- 5.5 Practice
- 5.5 Answers
- 5.5 Exam tips
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6
Gene Expression and Regulation
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- 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
- 6.8 Exam tips
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7
Natural Selection
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- 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
- 7.12 Exam tips
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8
Ecology
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- 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
- 8.7 Exam tips
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