AP Biology · Free-response questions 2019

8 questions, each with its course unit and the official scoring guidelines.

Official paper (PDF) · QuestionsAll AP Bio papers→

Question 2

Open answer
Question 2 — 2. A student studying two different aquatic, plant-eating, unicellular protist species (species A and B) designed an experiment to investigate the ecological relationship between the two species (Table 1). TABLE 1.…

Source: College Board — AP Biology, Free-response questions, 2019

Question 3

Open answer
Question 3 — 3. The pyruvate dehydrogenase complex P D C catalyzes the conversion of pyruvate to acetyl C o A, a substrate for the Krebs (citric acid) cycle. The rate of pyruvate conversion is greatly reduced in individuals with P D…

Source: College Board — AP Biology, Free-response questions, 2019

Question 5

Open answer
Question 5 — TABLE 1. DIVERGENCE (IN PERCENT) OF MITOCHONDRIAL DNA SEQUENCES AMONG FIVE PRIMATE SPECIES Human Gorilla Orangutan Gibbon Chimpanzee Human - 10.3 16.1 18.1 8.8 Gorilla - 16.7 18.9 10.6 Orangutan - 18.9 17.2 Gibbon -…

Source: College Board — AP Biology, Free-response questions, 2019

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Question 8

Open answer
Question 8 — T h e f i g u re presents a 3 column table titled “Table 1, Changes in Morning Glo ry Peta l Cell s During Fl ower Ope ning.” There is n o hea ding for col umn 1. The heading for column 2 is “Bud.” The heading for…

Source: College Board — AP Biology, Free-response questions, 2019

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