PassProfessor’s AP Biology program is part of the expanding PassProfessor catalog. The 826-question practice bank — original multiple-choice-style questions built on the College Board’s published framework — is built and QC-verified, and enrollment opens soon. Join the notify list and we will email you the day it launches — then use this guide to plan your path to the May exam.
This program is part of the expanding PassProfessor catalog — join the notify list and we’ll email you when enrollment opens.
The AP Biology exam, in one paragraph
AP Biology is the College Board’s introductory college-level biology course and exam, built around four big ideas — evolution, energetics, information storage and transmission, and systems interactions — and organized into 8 units. The exam itself is a 3-hour hybrid digital test given through schools each May: Section I is 60 multiple-choice questions in 90 minutes (50% of your score), and Section II is 6 free-response questions — 2 long and 4 short — in 90 minutes (the other 50%). You receive an AP score from 1 to 5. There is no separate pass or fail set by a state or employer: what your score earns you is decided by the colleges you apply to.
Who can take the AP Biology exam?
- Students enrolled in an AP Biology course at a school that offers it are the standard candidates. You join your class section through your College Board account, and your school’s AP coordinator orders your exam.
- Exam-only and homeschooled students can also test: AP exams are administered through schools, so a student who is not enrolled in the course arranges to test through a participating school’s AP coordinator. Start that conversation early in the fall — schools set their own deadlines for exam-only registrations, and seats are not automatic.
- There is no College Board age or grade requirement published for AP Biology itself; readiness is a course question, not an eligibility rule. AP Biology is a college-level course with substantial laboratory and quantitative work, and schools typically expect prior high-school biology — and the mathematics the course’s calculations require — before enrollment.
- Students with documented disabilities may be eligible for testing accommodations through the College Board’s Services for Students with Disabilities. Applications go through your school, and approval takes time — raise it with your coordinator at the start of the year, not in April.
The exam, piece by piece
The AP Biology exam is one 3-hour sitting in two sections, each worth exactly half your score. Per the College Board, it is a hybrid digital exam: you complete the multiple-choice questions and view the free-response questions in the Bluebook testing app, and you handwrite your free-response answers in paper exam booklets.
| Section | Questions | Time | Weight |
|---|---|---|---|
| Section I: Multiple Choice | 60 | 90 minutes | 50% of score |
| Section II: Free Response | 6 (2 long + 4 short) | 90 minutes | 50% of score |
| Total | 66 | 3 hours | 100% |
What Section I asks you to do
Per the College Board, Section I mixes standalone questions with sets of questions that share the same information, diagram, or data presentation. It tests whether you can explain biological concepts, processes, and models; analyze diagrams, flow charts, and other visual representations; use the scientific method; perform mathematical calculations to analyze data; and support scientific claims with evidence. In practice that means the section rewards reading carefully and calculating accurately at least as much as it rewards recall — a question may hand you an experiment you have never seen and ask what its results support.
What Section II asks you to do
Section II’s two long questions focus on interpreting and evaluating experimental results — one of them involves graphing — and its four short questions cover scientific investigation, conceptual analysis, analysis of a model or visual representation, and analysis of data. Across the section, per the College Board, you will interpret and evaluate results from an experiment, graph and analyze data, apply the principles and procedures of lab investigations, predict the causes or effects of a change in a biological system, and analyze a visual representation of a biological phenomenon. Every answer is handwritten prose, tables, or graphs — there is nothing to select. That is why no multiple-choice product, including ours, can practice this section for you: it has to be rehearsed by writing.
The 8 units and their weights
The College Board publishes each unit’s weighting on the multiple-choice section. These ranges are the single most useful planning numbers in this guide:
| Unit | What it covers, in brief | Weighting on Section I |
|---|---|---|
| Unit 1: Chemistry of Life | Water and its properties; the structure and function of the large biological molecules | 8–11% |
| Unit 2: Cell Structure and Function | What cells are made of, how their parts work, and how membranes regulate what moves in and out | 10–13% |
| Unit 3: Cellular Energetics | Enzymes, photosynthesis, and cellular respiration — how cells capture, store, and release energy | 12–16% |
| Unit 4: Cell Communication and Cell Cycle | How cells signal each other, and how the cell cycle is controlled as cells divide | 10–15% |
| Unit 5: Heredity | Meiosis and the patterns by which traits pass from parents to offspring | 8–11% |
| Unit 6: Gene Expression and Regulation | How genetic information is stored, expressed, regulated, and changed | 12–16% |
| Unit 7: Natural Selection | Evolution by natural selection and the population genetics that describes it | 13–20% |
| Unit 8: Ecology | Populations, communities, ecosystems, and how organisms interact with their environment | 10–15% |
Three structural facts that shape how you should prepare:
- Unit 7 is the heavyweight. Natural Selection, at 13–20% of Section I, can be worth up to a fifth of the multiple-choice section on its own — and its Hardy–Weinberg and selection calculations are among the most learnable points on the exam.
- Units 3 and 6 are next, at 12–16% each. Cellular Energetics and Gene Expression and Regulation together with Unit 7 can account for roughly half of Section I. A study plan that weights time by these ranges is simply following the College Board’s own published design.
- No unit is optional. Even the lightest units, at 8–11%, represent roughly five to seven multiple-choice questions — and the free-response section draws across the course as well. Weight your extra time; do not skip content.
The science practices behind the questions
Content is only half the framework. The College Board also publishes the weighting of six science practices on the multiple-choice section: Concept Explanation (25–33%), Argumentation (20–26%), Visual Representations (16–24%), and Questions and Methods, Representing and Describing Data, and Statistical Tests and Data Analysis (8–14% each). Read those numbers plainly: the largest single skill block on Section I is explaining concepts, the second is building and justifying an argument from evidence, and roughly a third of the section turns on visuals, data, methods, and statistics combined. Memorizing definitions without practicing data and argument leaves that third — and the argumentation fifth — unprepared.
The scoring scale, explained
AP scores are reported on a 1–5 scale, set by the College Board from your combined performance on both sections:
- 5 — Extremely well qualified
- 4 — Well qualified
- 3 — Qualified
- 2 — Possibly qualified
- 1 — No recommendation
What those numbers buy you is not decided by the College Board. Each college and university sets its own AP credit and placement policy — which scores it accepts, and for which courses. Many institutions begin granting credit at a 3, competitive programs often require a 4 or 5, and some grant placement without credit. The College Board’s AP Credit Policy Search lets you look up the policy at each school you are considering; do that before you decide how much a particular score matters to you, because the answer genuinely differs by school and sometimes by major.
Two consequences worth planning around:
- There is one combined score, not two. A strong Section I can offset a weaker Section II and vice versa — but with each section at exactly 50%, neither half can be neglected and still produce a top score.
- Scores arrive in the summer. AP scores are released in July, after the May exam window. Seniors should arrange for their scores to be sent to the college they will attend; your score report goes where you direct it.
Fees and registration, step by step
You do not register with — or pay — the College Board directly, and you never pay PassProfessor for the exam itself. AP exams are ordered and paid for through your school.
| Payment | Amount | Notes |
|---|---|---|
| AP Biology exam fee (schools in the U.S., U.S. territories, Canada, and DoDEA schools) | $99 per exam | The standard College Board fee for 2026–27 |
| AP Biology exam fee (schools outside the U.S.) | $129 per exam | Fees at College Board–authorized test centers outside the U.S. may vary |
| College Board fee reduction (eligible students) | $37 off per exam | For students with significant financial need; schools are expected to forgo their $9 rebate for fee-reduced students, bringing the U.S. cost to $53 |
| Late order fee | $40 per exam, in addition | Applies to exams ordered after the November ordering deadline |
| Unused / canceled exam fee | $40 per exam | Charged instead of the full fee if an ordered exam is canceled or not taken after the deadline |
Your school may charge more than the published fee to cover its own administration costs — your AP coordinator’s figure is the one you will actually pay.
The sequence, in order:
- Join your class section in the fall. Your teacher gives you a join code for your AP class section in your College Board account. Joining is how the College Board knows which exam to order for you.
- Confirm your exam order before the November deadline. On-time ordering for full-year courses closes in November (November 13 for the 2027 exams). Orders placed after that deadline incur the $40 late fee. If you are an exam-only or homeschooled student, your host school’s internal deadline will be earlier — treat October as your real deadline.
- Pay your school. Schools collect exam fees on their own schedules and by their own methods. Keep your receipt and confirm your name and exam are correct on the school’s order.
- Practice on Bluebook before May. Download the Bluebook app and use the College Board’s test preview so the digital format — and the switch to handwritten free-response booklets — is familiar before exam day.
- Test in May at your school. AP exams are given on the College Board’s national May schedule, at your school (or your host school), under proctored conditions. Your coordinator tells you the exact date, room, and arrival time for AP Biology.
Retakes and score validity
- AP exams are offered once a year, in May. There is no mid-year or summer retake window. If you want to improve a score, you register again through a school and test the following May.
- You may retake AP Biology. Nothing in the AP Program prevents a student from taking the same exam in a later year; students who take a course as a sophomore or junior sometimes retest as seniors. Whether a retake is worth a second year of preparation is a question to settle with your target colleges’ credit policies in hand.
- Every score is reported unless you act. When you send scores to a college, you can choose to withhold a score from a specific institution, and the College Board also offers score cancellation — both are handled through the College Board, for a fee or by deadline depending on the option. If a low score is sitting next to strong ones, look at these options before you send.
- Scores do not expire for college-reporting purposes in the ordinary course cycle, but colleges decide what they accept and when. If you are testing well before senior year, confirm that your target schools will still honor the score when you enroll.
Exam day
- Know your format before you arrive. Section I is answered in the Bluebook app; Section II questions are viewed in Bluebook but answered by hand in paper booklets. Bring the handwriting stamina for 90 minutes of written answers — students are routinely surprised by how physical that is.
- Calculators are permitted on this exam under the College Board’s calculator policy, and reference materials — equations and reference information for AP Biology — are provided. Check the approved-calculator list in advance and bring a calculator you already know how to use; exam day is not the time to learn a new one.
- Pace Section I at 90 seconds a question. Sixty questions in 90 minutes leaves no room to camp on a single stimulus set. Answer what you know, flag the rest, and return with whatever time remains.
- Pace Section II by the clock, not by the question. Ninety minutes across 6 questions means the two long questions deserve the largest blocks and the four short questions roughly ten minutes each. A short question answered completely beats a long question polished while two shorts sit blank.
- Answer every part of every free-response question. Free-response scoring awards points for specific correct statements, predictions, justifications, and graph elements. A blank part earns nothing; a direct, on-command-word answer — describe, explain, justify, predict — gives the reader something to score.
- Follow your coordinator’s instructions on arrival time, ID, and permitted materials. Schools run AP exams under College Board security rules; what enters the testing room is their call under those rules, and a preventable logistics problem is the most avoidable way to lose an exam day.
How to study for this exam
The framework is the syllabus — the College Board publishes the 8 units, their weights, and the science practices, and a plan built on that structure beats a plan built on a textbook’s table of contents. A sequence that follows the evidence in this guide:
- Allocate time by published weight. Natural Selection (13–20%), Cellular Energetics (12–16%), and Gene Expression and Regulation (12–16%) carry the most Section I weight. Give them the most hours — then cover everything else, because the lightest unit is still five to seven questions.
- Practice the calculation families until they are automatic. Water potential, Hardy–Weinberg equilibrium, chi-square tests, population growth, surface-area-to-volume ratios, and basic statistics recur across units and across both the practice-weighting table and real exams. These are the most coachable points on the test: the formulas are few, the setups repeat, and accuracy is trainable.
- Train stimulus reading as its own skill. Much of Section I hands you an unfamiliar experiment, graph, or data table. Practice extracting what was manipulated, what was measured, and what the data actually support before looking at the answer choices — that discipline is what the Argumentation and data practices, together nearly half the section’s skill weight, are measuring.
- Write free responses by hand, on a timer, every week. Section II is 50% of your score and the only part of this exam no question bank can drill. Write to the command words, construct graphs by hand, and review your answers against the question’s parts — a missed part is lost points no amount of content knowledge recovers.
- Sit full Section I simulations at real pace. Sixty questions in 90 minutes is a pacing skill separate from knowledge. Timed simulations expose both your weak units and your slow question types while there is still time to fix them.
- Use your scores diagnostically. After each practice block, sort your misses: content you did not know, data you misread, calculations you set up wrong, and time you ran out of. Each cause has a different fix, and only the first one is “study more.”
PassProfessor’s AP Biology practice bank (826 original multiple-choice-style questions, mapped to the 8 units with dedicated stimulus, quantitative, applied, and synthesis sets) is built for steps 1, 2, 3, and 5 above. The AP Biology program page shows the full coverage table — and the notify list there will email you when enrollment opens. Step 4 — the writing — is yours and your teacher’s, and this guide will not pretend otherwise.
Frequently asked questions
How long is the AP Biology exam? Three hours in total: Section I, 60 multiple-choice questions in 90 minutes, and Section II, 6 free-response questions in 90 minutes. Each section is worth 50% of your score.
How many units are in AP Biology? Eight, per the College Board’s course framework: Chemistry of Life; Cell Structure and Function; Cellular Energetics; Cell Communication and Cell Cycle; Heredity; Gene Expression and Regulation; Natural Selection; and Ecology.
Which AP Biology unit is weighted most heavily? Unit 7, Natural Selection, at 13–20% of the multiple-choice section — the heaviest single unit. Units 3 (Cellular Energetics) and 6 (Gene Expression and Regulation) follow at 12–16% each.
What score do I need for college credit in AP Biology? There is no single answer. Each college and university sets its own AP credit and placement policy; many begin granting credit at a score of 3, and more selective programs often require a 4 or 5. Look up each of your target schools in the College Board’s AP Credit Policy Search.
How much does the AP Biology exam cost? Per the College Board, $99 per exam at schools in the U.S., U.S. territories, Canada, and DoDEA schools, and $129 at schools outside the U.S. Eligible students receive a $37 College Board fee reduction per exam. You pay through your school, which may add its own administration costs.
How do I register for the AP Biology exam? Through your school: join your AP class section with the join code from your teacher, and your school’s AP coordinator orders your exam. On-time ordering closes in November for full-year courses; late orders add a $40 fee per exam. Exam-only and homeschooled students arrange testing through a participating school’s coordinator.
Is the AP Biology exam taken on a computer? It is a hybrid digital exam. Per the College Board, multiple-choice questions are completed and free-response questions are viewed in the Bluebook testing app, while free-response answers are handwritten in paper exam booklets.
Can I use a calculator on AP Biology? Yes — calculators are permitted on this exam under the College Board’s calculator policy, and AP Biology reference materials, including equations and reference information, are provided. Confirm your calculator model appears on the College Board’s approved list.
What are the long and short free-response questions? Section II has 2 long questions, centered on interpreting and evaluating experimental results (including graphing), and 4 short questions covering scientific investigation, conceptual analysis, analysis of a model or visual representation, and analysis of data. All six are answered in handwriting.
Can a practice question bank prepare me for the free-response section? No — and be skeptical of any product that says otherwise. Free-response answers are handwritten explanations, predictions, justifications, and graphs; they are practiced by writing under time, with feedback. A multiple-choice bank builds the content, data, and calculation fluency those answers draw on, which is valuable — but it is not writing practice.
When are AP Biology scores released? AP scores are released in July, following the May exam window. You access and send your scores through your College Board account; arrange for your scores to be sent to the college you will attend.
Can I retake the AP Biology exam? Yes, the following May — AP exams are offered once a year. You register again through a school and pay the exam fee again. Check your target colleges’ credit policies first to confirm a higher score would change what you earn.
Does PassProfessor use real AP Biology questions? No. PassProfessor’s 826 AP Biology questions are original items written to the structure of the College Board’s published course framework. We never use released exam questions, Course and Exam Description sample questions, or recalled items.
Disclaimer
PassProfessor is an independent exam-preparation provider and is not affiliated with, endorsed by, or sponsored by the College Board. AP® is a trademark of the College Board, which does not sponsor or endorse this product. This guide is general information about the AP Biology exam, current as of October 2026; College Board publications govern if anything here differs from them.