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AP Biology

Connect mechanisms across molecules, cells, heredity, evolution and ecology while building the experimental, visual, quantitative and evidence-based reasoning required throughout the current AP Biology course and exam.

Syllabus
Verified for the 2026 AP exam
Course
Biology

Questions to revisit

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Explore all eight AP Biology units

Navigate 60 Topics across the eight official Units. Use College Board MCQ weighting ranges to plan time, but keep practising cross-unit science practices rather than treating lower-weight Units as optional.

8
syllabus groups
60
mapped topics
  1. 1 Chemistry of Life7 topics Explore unit
  2. 2 Cells10 topics Explore unit
  3. 3 Cellular Energetics5 topics Explore unit
  4. 4 Cell Communication and Cell Cycle6 topics Explore unit
  5. 5 Heredity5 topics Explore unit
  6. 6 Gene Expression and Regulation8 topics Explore unit
  7. 7 Natural Selection12 topics Explore unit
  8. 8 Ecology7 topics Explore unit

Where to start

Begin with one known Unit or use mixed stimulus questions to locate the first repeatable science-practice failure.

Choose your starting point

  1. I know the weak Topic

    Open its exact Unit and Topic, then identify the mechanism, representation and evidence you must be able to explain.

    Browse all eight Units

  2. I do not know what is weak

    Attempt a short mixed set and stop at the first repeated concept, data, method or argumentation error.

    Open mixed questions

Choose the right starting point

  1. Explain the mechanism

    Describe the causal sequence, connect structure to function and predict what changes when one variable is altered.

    Review a Concept

  2. Retrieve and represent

    Recall the process without notes, then sketch, label or interpret the model, graph, pathway or experimental design.

    Check Mastery

  3. Apply, mark and repair

    Solve an unfamiliar stimulus question, compare against scoring evidence and repeat after correcting the first failed reasoning step.

    Practise AP questions

How to study AP Biology

Connect biological mechanisms with models, experiments, data and evidence, then practise current AP Biology MCQs and handwritten FRQs as distinct tasks.

Practise biology through science practices

Pair each content family with the representation, investigation, quantitative reasoning and evidence habits required by current AP Biology assessment.

  • Molecules and cellular energetics

    Macromolecules, enzymes, photosynthesis and cellular respiration

    Draw the causal pathway and track matter, energy and regulation through each step. Predict how a changed condition affects rate or output, then use a graph or experimental result to justify the mechanism.

    Practise cellular processes

  • Cells, transport and signalling

    Membranes, osmoregulation, signal transduction and the cell cycle

    Connect structure to movement or communication, label the relevant model and predict a perturbation. Separate what the diagram shows from the biological claim, then support the claim with specific evidence.

    Practise cell systems

  • Heredity and gene regulation

    Meiosis, inheritance, gene expression, mutations and biotechnology

    Move between chromosome behaviour, molecular mechanisms and phenotype. Set up probability or data work visibly, identify the source of variation and explain how the evidence supports an inheritance or regulation conclusion.

    Practise genetics

  • Evolution and ecology

    Population genetics, natural selection, energy flow and community change

    State the population-level mechanism before interpreting frequencies, phylogenies or ecological data. Distinguish correlation from causal evidence, test the prediction against the stimulus and explain change across generations or trophic levels.

    Practise evolution and ecology

  • Investigations, data and FRQs

    Experimental design, graphs, statistics, long FRQs and short FRQs

    Identify variables, controls and uncertainty before calculating or graphing. Practise concise claims, evidence and reasoning, evaluate whether the method supports the conclusion and handwrite complete responses under separate long- and short-question timing.

    Practise FRQ skills

Build a consistent study approach

AP Biology rewards more than recalling terms. Use the eight-unit syllabus map to trace cause and effect across molecules, cells, heredity, evolution and ecosystems. For each Topic, explain the mechanism, read or construct a representation, identify variables and controls, analyse data and support a claim with evidence. These actions directly reflect the six College Board science practices.

Rebuild a weak mechanism in Concept, check retrieval in Mastery and apply it to unfamiliar stimuli in the Question Bank. After marking, label the first failure as concept, representation, experimental method, calculation, data interpretation or argumentation. Repair that one failure, then answer a matched question without notes so correction becomes usable exam skill rather than passive review.

AP Biology exam format

The current three-hour hybrid digital exam has two 90-minute sections worth 50% each: 60 Bluebook multiple-choice questions and six free-response prompts answered by hand.

Paper / componentQuestionsTime% of grade
Section I: Multiple Choice60 questionsDiscrete questions and stimulus-linked sets are completed in Bluebook.How to prepare: Practise selecting concepts from unfamiliar diagrams, experiments and data while maintaining enough pace to complete 60 questions in 90 minutes.1 hour 30 minutes50%
Section II: Free Response6 questions: 2 long and 4 shortPrompts are viewed in Bluebook and responses are handwritten; tasks include experimental analysis, graphing, models, concepts and data.How to prepare: Train long and short prompts separately, plan claims and evidence before writing, construct graphs carefully and make every reasoning link explicit.1 hour 30 minutes50%

SourceCollege Board · AP Biology ExamAP Biology · 2026 exam

Frequently Asked Questions

College Board identifies the current AP Biology Course and Exam Description as effective Fall 2025. It organizes the course into eight commonly taught Units and six science practices; the Unit order is a recommended framework, not a mandatory teaching sequence.

Natural Selection has the largest official range at 13%–20% of the multiple-choice section. Cellular Energetics and Gene Expression and Regulation each carry 12%–16%. These are ranges for MCQs, not whole-exam percentages or permission to skip other Units.

It is hybrid digital. Students complete the 60 multiple-choice questions and view free-response prompts in Bluebook, then handwrite answers to the two long and four short FRQs in paper booklets during the second 90-minute section.

Practise long and short prompts separately using official released questions and scoring guidance. Identify the command, plan the claim and evidence, show graphing or quantitative work clearly, evaluate the experimental method and then rewrite the response after repairing the first missing reasoning link.

College Board provides subject-specific AP Biology reference information and permits approved calculators under its exam-day policies. Practise using both while showing setup, units and interpretation; a calculator result alone does not demonstrate the biological or statistical reasoning the question asks for.