College AP
SATACTAP
Sign up

AP Biology

What the AP Biology exam covers, how it's scored, the eight units it's built on, and how to practice your way to a 5.

Start Biology practiceAll AP subjects
AP Biology dashboard with unit map, multiple-choice and free-response practice

AP Biology is a college-level introductory biology course and exam covering eight units, from the chemistry of life to ecology. The exam runs about 3 hours: a 60-question multiple-choice section and a 6-question free-response section, scored from 1 to 5. It's taken in May, and many colleges grant credit for a 3 or higher — confirm your target college's policy.

AP Biology in PrepScore

Practice, write, rehearse and review.

Four connected tools follow the same 8 units and exam structure.

1–5The AP score scale; a 3 is the common "passing" line.
60 + 660 multiple-choice and 6 free-response questions.
~3 hours90 minutes each section, with a calculator allowed.
8 unitsFrom the chemistry of life to ecology.
What's on it

Two sections, eight units

The exam splits evenly between multiple choice and free response, and questions are drawn from the eight units of the course.

Multiple choice

60 questions, 90 minutes.

Discrete questions and sets tied to data, experiments and models — worth half your score. Reading graphs and interpreting results matters as much as recall.

Free response

6 questions, 90 minutes.

Two long-form and four short-form questions that reward clear reasoning, experimental design and data analysis — the other half of your score.

Scoring

One 1–5 score.

The two sections combine into a single 1–5. A 3 is "qualified"; a 4 or 5 is strong. Credit policies are set by each college — confirm yours.

Practice it, unit by unit.

Reading about biology isn't the same as answering AP-style questions and learning from every miss. Start free and practice by unit.

Start free
The eight units

What AP Biology covers

  • Unit 1 — Chemistry of Life
  • Unit 2 — Cell Structure and Function
  • Unit 3 — Cellular Energetics
  • Unit 4 — Cell Communication and Cell Cycle
  • Unit 5 — Heredity
  • Unit 6 — Gene Expression and Regulation
  • Unit 7 — Natural Selection
  • Unit 8 — Ecology

How to study for AP Biology

  • Practice one unit at a time, then mix units like the exam does.
  • Drill the free-response — especially experimental design and data analysis.
  • Learn to read graphs and tables quickly; the exam leans on them.
  • Review every miss until the concept, not just the answer, is clear.
  • Sit timed sets to build pace across both sections.
FAQ

AP Biology questions

What's on the AP Biology exam?
Two sections in about 3 hours: 60 multiple-choice questions (90 minutes) and 6 free-response questions (90 minutes), drawn from the course's eight units. A calculator is allowed throughout, and a formula sheet is provided.
How is AP Biology scored?
On the 1–5 AP scale. The multiple-choice and free-response sections are combined into that single 1–5 score. Score distributions vary by year — confirm current data on College Board.
What is a good AP Biology score?
A 3 is considered qualified and is the common "passing" line; a 4 or 5 is strong and accepted for credit more widely. The credit policy that matters is your target college's — confirm it on the school's site.
How hard is AP Biology?
It's challenging because it rewards reasoning, data analysis and experimental design, not just memorization. With steady practice by unit and on the free-response, it's very manageable.
When is the AP Biology exam?
In May, on the College Board's fixed AP exam schedule. Confirm the current year's date on College Board.
Related

Keep exploring AP.

Free Biology practiceAP-style questions with full explanations. All AP subjectsBrowse every AP exam guide. AP ChemistryExam, scoring & units. AP Environmental ScienceExam, scoring & units. AP PsychologyExam, scoring & units.

Start practicing AP Biology — free.

Create a free account and practice by unit, with a full explanation on every question.

Start freeSee pricing