📝 Unit Tests

AP Biology Unit Tests

Pick a unit to drill it head-on. Each unit has 4 different test variations so you can keep retaking until you master it.

18–25% of exam

Water, biomolecules, cell organelles, membranes, and transport.

12 questions · ~18 min

Pick a variation

18–25% of exam

Enzymes, photosynthesis, cellular respiration, signaling, and the cell cycle.

12 questions · ~18 min

Pick a variation

8–11% of exam

Meiosis, Mendelian and non-Mendelian inheritance, and genetics problems.

12 questions · ~18 min

Pick a variation

12–16% of exam

DNA, RNA, transcription, translation, mutations, and biotechnology.

12 questions · ~18 min

Pick a variation

13–20% of exam

Evidence of evolution, Hardy-Weinberg, speciation, and phylogeny.

12 questions · ~18 min

Pick a variation

10–15% of exam

Population ecology, community interactions, ecosystems, and biogeochemical cycles.

12 questions · ~18 min

Pick a variation

How unit tests work

Focused on a single AP unit, between a single-topic quiz and the full diagnostic.
4 variations per unit — pick a fresh variation any time you retake.
Roughly 90 seconds per question — the same pacing as the AP exam.
You'll get a unit-level score, recommended topics to review, and a question-by-question explanation.

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