AP AP Biology Past Papers
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Available years: 2025, 2024, 2023
The 2025 AP Biology Section II Free-Response exam consisted of 6 structured multi-part questions totaling 33 marks over 90 minutes. Overall performance showed strong competence on straightforward graph construction (Q2) and data identification tasks, but highlighted persistent difficulties with justifying experimental controls, multi-variable data synthesis (Q1, Q6), and elucidating biochemical mechanisms such as allosteric regulation and membrane channel amino acid polarity.
The 2024 AP Biology Free-Response section consisted of 6 multi-part questions totaling 34 marks across a 90-minute sitting. Performance was anchored by solid foundational knowledge in membrane transport (Question 3) and ecological food web dynamics (Question 4), but saw sharp score drops on Question 5 (phylogeny and regulatory element evolution, averaging 0.80/4) and mechanistic justifications involving cellular respiration disruptions (Question 2) and nondisjunction mechanisms (Question 1).
The 2023 AP Biology Free-Response examination comprised 6 multi-part questions totaling 34 marks over 90 minutes. Long questions centered on signal transduction pathways with experimental design (Question 1, 9 marks) and organelle density graphing with maternal mitochondrial inheritance (Question 2, 9 marks). Short questions addressed ecosystem resilience and keystone species (Question 3), cyclic/noncyclic photophosphorylation (Question 4), phylogenetic tree analysis and convergent evolution (Question 5), and housekeeping gene qPCR analysis with eukaryotic gene regulation (Question 6).
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