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Download free-response questions from past AP Biology exams, along with scoring guidelines, sample responses from exam takers, and scoring distributions.
- 2002 Grade Distributions
Grade distributions for the 2002 AP Biology Exam. AP at a...
- 2007 Scoring Statistics
Scoring statistics for the 2007 AP Biology Exam. AP at a...
- 2002 Grade Distributions
- Circle (1 point)
- Identification (1 point)
- Prediction (1 point)
- Explanation (2 points)
- Description (1 point)
- Completion (3 points)
- Reasoning (1 point)
- Evidence (1 point per row; 2 points max.)
- Prediction (2 points)
- Justification (1 point)
- Identification (1 point)
- (1 point per row; 2 points max.)
- Description (1 point)
- Prediction (1 point)
- (1 point per row; 2 points max.)
- Construction (1 point)
- Reasoning (1 point)
- Identification (1 point)
- Prediction (1 Point)
- Reasoning (1 point)
- Description (1 point)
- Reasoning (1 point)
• Circle around either arrow pointing from a gene (Trp-T or YUC) to mRNA
• IAA (b) Predict how the deletion of one base pair in the fourth codon of the coding region of gene Trp-T would most likely affect the production of IAA. Justify your prediction.
• Reduction in IAA production OR No production of IAA
Negative feedback/feedback inhibition/increasing amounts of IAA inhibits the pathway. Production of YUC enzyme is inhibited OR YUC enzyme activity is inhibited. (d) Rhizobacteria are a group of bacteria that live in nodules on plant roots. Rhizobacteria can produce IAA and convert atmospheric nitrogen into forms that can be used by plants. Plants r...
Increases habitat/number of nodules for the rhizobacteria. The bacteria receive carbon/carbon-containing molecules (as a result of increased plant growth). (e) A researcher removed a plant nodule and identified several “cheater” rhizobacteria that do not produce IAA or fix nitrogen. Describe the evolutionary advantage of being a bacterial cheater i...
Correctly plotted lines for remaining two treatments Correctly labeled axes including units Correctly labeled data lines (b) As shown in the table, the researcher established treatment group II with 5 individuals of each species. Provide reasoning for the reduced initial population sizes.
Reduced initial population sizes keep the total number of organisms the same in all containers. Reduced initial population sizes serve as a control for population density. (c) The student claims that species A and B compete for the same food source. Provide TWO pieces of evidence from the data that support the student’s claim.
(d) Predict TWO factors that most likely limit the population growth of species A in treatment group I.
Acceptable factors include: Food Space Metabolic waste Dissolved oxygen (e) Many protists contain an organelle called a contractile vacuole that pumps water out of the cell. The student repeated the experiment using a growth medium with a lower solute concentration. Predict how the activity of the contractile vacuole will change under the new e...
The environment is hypotonic with respect to the cell. The cell is hypertonic with respect to environment. Water has entered the cell (which could cause lysis). The cell has lower water potential than the environment/the environment has higher water potential than the cell. The pyruvate dehydrogenase complex (PDC) catalyzes the conversion of pyruva...
Mitochondria Mitochondrial matrix (b) Make a claim about how PDC deficiency affects the amount of NADH produced by glycolysis AND the amount of NADH produced by the Krebs (citric acid) cycle in a cell. Provide reasoning to support your claims based on the position of the PDC-catalyzed reaction in the sequence of the cellular respiration pathway.
(c) PDC deficiency is caused by mutations in the PDHA1 gene, which is located on the X chromosome. A male with PDC deficiency and a homozygous female with no family history of PDC deficiency have a male offspring. Calculate the probability that the male offspring will have PDC deficiency.
• It will increase the number of action potentials.
• It will stay the same. (b) The researcher proposes two models, A and B, for using acetylcholinesterase (AChE), an enzyme that degrades acetylcholine, to prevent the effect of the neurotoxin. In model A, AChE is added to the synapse. In model B, AChE is added to the cytoplasm of the postsynaptic cell. Predict the effectiveness of EACH proposed ...
A researcher studying the evolutionary relationship among five primate species obtained data from a sequence of mitochondrial DNA (mtDNA) from a representative individual of each species. The researcher then calculated the percent divergence in the sequences between each pair of primate species (Table 1). (a) Based on fossil data, the researcher es...
• From top to bottom: Human/Chimpanzee (interchangeable), Gorilla, Orangutan
Gibbon mtDNA is the least similar (to all of the other species)/most different (from all of the other species). Gibbon mtDNA is the most divergent (from all of the other species). (c) On the cladogram, draw a circle around all of the species that are descended from the species indicated by the node within the square.
(Positive) control (for yeast growth). To test the viability of all yeast strains. Treatment I allows the researcher to be confident that changes in experimental outcome are due to differences in treatments. (b) Provide reasoning to explain how Mutant 1 can grow on treatment I medium but cannot grow on treatment III medium.
There will be growth (+) in all four cells of the fourth column. researcher is studying patterns of gene expression in mice. The researcher collected samples from six different tissues in a healthy mouse and measured the amount of mRNA from six genes. The data are shown in Figure 1. Figure 1. mRNA expression levels of six genes (a) Based on the d...
(Gene G) is the only gene expressed in all (six) tissues, AND glycolysis occurs in all (six) tissues. (Gene G) mRNA is the only mRNA present in all (six) tissues, AND glycolysis occurs in all (six) tissues. (b) The researcher observed that tissues with a high level of gene H mRNA did not always have gene H protein. Provide reasoning to explain ho...
• It moves H out of the vacuole. (b) A researcher claims that the activation of the K / H transport protein causes the vacuole to swell with water. Provide reasoning to support the researcher’s claim.
The concentration of solute ( K ) is increasing inside the vacuole. The solute ( K ) is moving into the vacuole, making it hypertonic/hyperosmotic/lowering water potential.
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Try a quiz for Molecular and Cellular Biology, created from student-shared notes. What is the first step in the trafficking of a protein from the cytoplasm into the...
Questions 1 and 2 are long free-response questions that require about 22 minutes each to answer and are worth 10 points each. Questions 3–8 are short free-response questions that require about 6 minutes each to answer.
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