AP Biology Practice Test

This AP Biology practice test helps you prepare for the College Board AP Biology exam. Use these sample questions to practice applying biological concepts, analyzing experimental data, and connecting ideas across the major units of the course.

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Sample AP Biology questions

Try these practice questions to test your knowledge. Select an answer to see if you got it right.

AP Biology Sample Questions

Practice quiz

1. Which property of water is most directly responsible for the ability of aquatic organisms to survive in frozen ponds?

2. The fluid mosaic model describes the plasma membrane as having:

3. During cellular respiration, the electron transport chain is located in the:

4. A signal transduction pathway typically begins with:

5. In a cross between two heterozygous individuals (Aa × Aa), what is the expected phenotypic ratio if A is completely dominant?

6. Which process directly converts the nucleotide sequence of mRNA into an amino acid sequence?

7. The Hardy-Weinberg equilibrium can be used to determine whether evolution is occurring. Which condition would disrupt this equilibrium?

8. In an ecosystem, what role do decomposers play?

9. What is the function of the lac operon in E. coli?

10. Mitochondria and chloroplasts are thought to have originated as free-living prokaryotes. Which evidence supports this endosymbiotic theory?

11. Which type of reproductive isolation occurs when two species mate at different times of year?

12. A researcher observes that adding a specific enzyme inhibitor decreases the rate of a metabolic reaction. This inhibitor most likely:

13. In the carbon cycle, carbon dioxide is returned to the atmosphere primarily through:

0 of 13 answered

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Exam at a glance

AP Biology is a College Board exam equivalent to a first-year college biology course. The exam tests understanding of biological concepts, scientific practices, and the ability to analyze data and make predictions.

Detail	Information
Exam length	3 hours
Multiple-choice questions	60 questions in 90 minutes
Free-response questions	6 questions in 90 minutes (2 long, 4 short)
Exam weight	Multiple-choice: 50%; Free-response: 50%

Source: College Board AP Biology · Last reviewed Oct 22, 2026

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AP Biology content areas

Unit 1: Chemistry of Life

Water properties, macromolecules, and the chemical foundations of living systems.

Unit 2: Cell Structure and Function

Cell organelles, membranes, transport, and cellular compartmentalization.

Unit 3: Cellular Energetics

Enzymes, cellular respiration, photosynthesis, and energy transformations.

Unit 4: Cell Communication and Cell Cycle

Signal transduction, cell cycle regulation, and mitosis.

Unit 5: Heredity

Meiosis, Mendelian genetics, non-Mendelian inheritance, and chromosomal basis of inheritance.

Unit 6: Gene Expression and Regulation

DNA replication, transcription, translation, gene regulation, and biotechnology.

Unit 7: Natural Selection

Evidence for evolution, mechanisms of evolution, and speciation.

Unit 8: Ecology

Population ecology, community interactions, ecosystems, and biodiversity.

Study tips for AP Biology

Connect concepts across units

AP Biology emphasizes big ideas. Practice connecting topics like evolution, genetics, and ecology.

Master data analysis

Many questions require interpreting graphs, tables, and experimental data. Practice with varied data types.

Know key laboratory investigations

Be familiar with the 13 recommended labs and the principles behind them.

Practice free-response writing

FRQs require clear explanations. Practice writing concise answers that address all parts of the question.

Focus on processes

Understand how processes like cellular respiration and photosynthesis work step by step.

Clear answers

AP Biology FAQ

How long is the AP Biology exam?+

The AP Biology exam is 3 hours total: 90 minutes for 60 multiple-choice questions and 90 minutes for 6 free-response questions (2 long and 4 short).

What topics are covered on AP Biology?+

The exam covers eight units: Chemistry of Life, Cell Structure and Function, Cellular Energetics, Cell Communication and Cell Cycle, Heredity, Gene Expression and Regulation, Natural Selection, and Ecology.

Is AP Biology harder than regular biology?+

AP Biology is equivalent to a first-year college course and requires deeper understanding, data analysis skills, and the ability to make connections across topics.

What score do I need for college credit?+

Biology credit requirements depend on your intended college and major. STEM programs at selective schools often require a 4 or 5 for lab science credit. Check whether your target schools grant credit toward the biology sequence for your major.

Are there labs on the AP Biology exam?+

While you do not perform labs during the exam, questions may ask about laboratory concepts, experimental design, and data analysis based on the recommended investigations.

What math is needed for AP Biology?+

You should be comfortable with basic statistics (mean, standard deviation, chi-square), graphing, and applying mathematical formulas to biological problems.

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