Question 1
A herbicide blocks the transfer of electrons from photosystem II to the electron transport chain in the thylakoid membrane. Which prediction is best supported?
Get ready for AP Biology, one unit at a time.
Find your weakest unit in a free 23-minute test, fix it with a short lesson, then write free-response answers Mia marks point by point.
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Write a free-response answer, and Mia marks it
Type your answer to a short question in the exam's format. Mia marks every point, quotes the words that earned it and shows a full-credit answer.
Plan 2027 by unit weight
Units are not worth the same: Natural Selection is 13–20% of Section I, Chemistry of Life 8–11%. Set your hours and how sure you are of each unit, and get a week-by-week plan to May 3.
Find your weakest unit in 23 minutes
15 questions across all eight units, no account. You get your score in each unit, the one to fix first, a short lesson on it and four fresh questions to check it worked.
The eight units
The May 2027 exam: 60 multiple-choice questions and 6 free-response questions, 90 minutes each, on Monday, May 3, 2027.
Unit 1: Chemistry of Life
Water, the elements of life and the four kinds of macromolecule.
8–11% of Section I
Unit 2: Cells
Organelles, surface area, membranes, transport and water potential.
10–13% of Section I
Unit 3: Cellular Energetics
Enzymes, photosynthesis, cellular respiration and fermentation.
12–16% of Section I
Unit 4: Cell Communication and Cell Cycle
Signal transduction, feedback, the cell cycle and its checkpoints.
10–15% of Section I
Unit 5: Heredity
Meiosis, Mendelian and non-Mendelian inheritance, chi-square.
8–11% of Section I
Unit 6: Gene Expression and Regulation
Replication, transcription, translation, regulation, biotechnology.
12–16% of Section I
Unit 7: Natural Selection
Selection, Hardy-Weinberg, phylogeny, speciation, origins of life.
13–20% of Section I
Unit 8: Ecology
Responses, energy flow, populations, communities, disruption.
10–15% of Section I
Try four questions
Question 2
A mutation deletes the operator of the lac operon in E. coli, but the promoter is unchanged. Which prediction is best supported?
Question 3
| Years of spraying | Percent killed by standard dose |
|---|---|
| 0 | 95 |
| 2 | 88 |
| 4 | 72 |
| 6 | 51 |
| 8 | 34 |
| 10 | 22 |
An insecticide was sprayed on a town's mosquitoes every summer. Each year, mosquitoes from the town were exposed to the same dose in the lab. Which statement best describes the data?
Question 4
| Species | Plot X | Plot Y |
|---|---|---|
| A | 25 | 85 |
| B | 25 | 5 |
| C | 25 | 5 |
| D | 25 | 5 |
The table shows counts of four beetle species in two plots. Which statement about the two plots is correct?
In the course
- 24 interactive lessons
- 302 practice questions
- 26 free-response questions marked by Mia
- 2 full practice exams
Guides and free tools
Biology Genius Pro
US$59one payment
- 24 interactive lessons
- 302 practice questions
- 26 free-response questions marked point by point
- 2 full practice exams
Full refund within 14 days. Ask within 14 days of paying, for any reason. Our refund promise still applies after you start the course. The note under the pay button is about the separate legal right to cancel. Terms
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