AP Biology Progress Check walkthroughs.
Unit-by-unit explanations of the MCQ and FRQ content on AP Classroom Progress Checks. Each unit page shows the topics tested, the most common student mistakes, and a tip from someone who scored a 5.
All units, expandable.
Click a unit to see MCQ topics, FRQ structure, common mistakes, and a tip from a student who scored a 5.
U01Chemistry of Life
- Water properties
- Macromolecules
- Enzymes
- Enzyme kinetics graphs
U02Cell Structure and Function
- Organelles
- Membrane transport
- Compartmentalization
- Surface-area/volume math
U03Cellular Energetics
- Photosynthesis
- Cellular respiration
- Free energy
- Light/dark reaction comparison
U04Cell Communication and Cell Cycle
- Signal transduction
- Apoptosis
- Cell cycle regulation
- Signaling pathway diagrams
U05Heredity
- Mendelian
- Non-Mendelian
- Chromosomal
- Chi-square problems
U06Gene Expression and Regulation
- Transcription
- Translation
- Operons
- lac/trp operon scenarios
U07Natural Selection
- Evolution mechanisms
- Hardy-Weinberg
- Phylogeny
- Hardy-Weinberg calculations
U08Ecology
- Population growth
- Communities
- Ecosystems
- Population models
Pair the walkthrough with the calculator.
After each unit, plug your AP Classroom score breakdown into the calculator. You’ll see your trajectory in real numbers, not vibes.
Open Bio calculatorFrequently asked questions
Quick answers — written by humans, not a chatbot.
What's the difference between Bio Progress Checks and the real AP exam?
Progress Checks are unscaled — they’re unit-by-unit MCQ + FRQ practice that AP Classroom assigns. The real AP exam uses a curve to map your raw composite to a 1–5. The walkthroughs above explain the reasoning; the calculator estimates your exam score.
Should I do every Progress Check or skip around?
Do them in order the first time — each one builds on the last. If you’re reviewing in May, target the units where you’re weakest using the unit summaries above.
Why don't you publish exact answer keys?
AP Classroom assignments are graded as your own work. Posting raw keys would help cheaters and harm the students using Curve for actual studying. Our walkthroughs explain reasoning, not letter answers.