Unit guidesAP Biology

AP Biology: every unit, every topic

8 units · 60 multiple-choice questions (50% of your score) · 6 free-response questions (50%) · exam Monday, May 3, 2027, 263 days away

Unit 1
Chemistry of Life
7 topics
8–11%of the exam
175live questions
Unit 2
Cells
10 topics
10–13%of the exam
250live questions
Unit 3
Cellular Energetics
5 topics
12–16%of the exam
125live questions
Unit 4
Cell Communication and Cell Cycle
6 topics
10–15%of the exam
150live questions
Unit 5
Heredity
5 topics
8–11%of the exam
124live questions
Unit 6
Gene Expression and Regulation
8 topics
12–16%of the exam
200live questions
Unit 7
Natural Selection
12 topics
13–20%of the exam
314live questions
Unit 8
Ecology
7 topics
10–15%of the exam
191live questions
Receipts

1,529 AP Biology questions are live across these units.

Units, weightings, and topic titles are read from our machine-readable AP Biology course outline, verified against the published course framework on 2026-07-27.

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