An enzyme speeds a reaction primarily by
Correct answer: Lowering activation energy
Why: Enzymes lower activation energy without changing ΔG or equilibrium.
AP Biology Practice Questions: Free Questions
Answer original AP-style diagnostic questions, review explanations, and identify the next unit to study.
AP Biology diagnostic practice set
These are original practice questions, not copied College Board items. Use official released questions for final calibration.
Question 1 of 3
Review the reasoning after you finish
The interactive set keeps answers hidden while you work. This review section remains crawlable and gives every student a complete correction path after the attempt.
Independent assortment occurs because homologous pairs
Correct answer: Align independently at metaphase I
Why: Each homologous pair orients independently during metaphase I.
Natural selection directly changes
Correct answer: Allele frequencies in populations
Why: Differential reproductive success changes population allele frequencies over generations.
Practise each section under its own calculator rule
Practising with a calculator you will not be handed is the most common way a practice score stops predicting an exam score. Set each practice block up to match the section it rehearses.
| Section or part | What you may use | What that means for your work |
|---|---|---|
| Multiple choice | Four-function, scientific, or graphing calculator | Most items need no calculator at all; the ones that do are short - rates, percentages, and ratios. |
| Free response | Four-function, scientific, or graphing calculator | Used for chi-square, standard error, and Hardy-Weinberg arithmetic. |
| Provided for the whole exam | Formula and equation sheet | Chi-square, standard error, Hardy-Weinberg, and the surface-area formulas are given. Learn when each applies, not how each looks. |
How practice should cover the complete course
Chemistry of Life
Water, macromolecules, structure and function
8–11%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Cell Structure and Function
Membranes, transport, compartmentalization
10–13%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Cellular Energetics
Enzymes, photosynthesis, respiration
12–16%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Cell Communication and Cell Cycle
Signaling, feedback, mitosis
10–15%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Heredity
Meiosis, Mendelian and non-Mendelian inheritance
8–11%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Gene Expression and Regulation
DNA, RNA, biotechnology, regulation
12–16%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Natural Selection
Evolution, populations, phylogeny
13–20%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Ecology
Energy flow, populations, communities, biodiversity
10–15%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Use the result to focus your AP Biology review
Read the score as a map, not a verdict
Each answer shows a relationship between course knowledge and an exam decision. A miss may mean that a definition is unclear, a representation was misread, or the right method was not selected. Compare each miss with these AP Biology priorities before choosing the next unit or practice set.
- Experimental controls and variables
- Graphing with uncertainty
- Mechanism-based explanations
- Evolution as the unifying idea
- Connecting scales from molecule to ecosystem
Next steps after the AP Biology diagnostic
Use a four-step correction cycle
- Write the rule or idea behind every miss.
- Solve a second problem of the same type without looking back.
- Mix that skill with two older units tomorrow.
- Complete official released questions under authentic timing.
Questions about AP Biology exam practice
How many questions are on the AP Biology exam?
The published format is 60 questions on multiple choice and 6 questions on free response. Multiple choice — About 1.5 minutes each. Many items sit under a data set or a graph, so read the axes before the question. Free response — About 15 minutes each, but they are not equal - the long data-analysis questions deserve more than the short ones.
Which AP Biology units should I practise first?
Start with the heaviest published weightings: Natural Selection (13–20%), Cellular Energetics (12–16%), Gene Expression and Regulation (12–16%). Then repair whichever earlier unit those depend on.
Can I use a graphing calculator while I practise for AP Biology?
Only where the exam allows one, and practising otherwise builds the wrong habit. Multiple choice: Most items need no calculator at all; the ones that do are short - rates, percentages, and ratios. Free response: Used for chi-square, standard error, and Hardy-Weinberg arithmetic. Provided for the whole exam: Chi-square, standard error, Hardy-Weinberg, and the surface-area formulas are given. Learn when each applies, not how each looks.
What is the most common way students lose points on AP Biology?
Answering 'Explain' with a description. If your sentence has no 'because', 'which causes', or 'resulting in', it is a description and it will not score.
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