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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.
AP® BIOLOGY 2017 SCORING COMMENTARY Question 1 Overview This question was based on investigations of the effects of caffeine on memory in bees. Caffeine is often produced by plants in their nectar, and researchers studied the effect of caffeine on the probability of bees remembering and, therefore, revisiting a nectar source.
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- Description (2 points)
- Identification (3 points; 1 point per row)
- Proposed plant benefit (1 point)
- Question 2
- Question 2 (continued)
- Description (1 point)
- Question 4
- Construction of food web (2 points maximum)
- Question 4 (continued)
- Question 5
- Question 6
- Prediction (1 point)
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- Question 8
- Description (1 point)
- Explanation (2 points)
(c) Design an experiment using artificial flowers to investigate potential negative effects of increasing caffeine concentrations in nectar on the number of floral visits by bees. Identify the null hypothesis, an appropriate control treatment, and the predicted results that could be used to reject the null hypothesis.
(d) Researchers found that nectar with caffeine tends to have a lower sugar content than nectar without caffeine. Plants use less energy to produce the caffeine in nectar than they do to produce the sugar in nectar. Propose ONE benefit to plants that produce nectar with caffeine and a lower sugar content. Propose ONE cost to bees that visit the flo...
More pollen is transferred/more visits by pollinators. Plants store energy/have more energy available for other uses.
Figure 1. The effect of karrikins (KAR) and trimethylbutenolides (TMB) on seed germination in Lactuca plants. Error bars represent ±2SE X . Fires frequently occur in some ecosystems and can destroy all above-ground vegetation. Many species of plants in these ecosystems respond to compounds in smoke that regulate seed germination after a major fire....
(a) The researchers made the following claims about the effect of KAR and the effect of TMB on seed germination relative to the control treatment. KAR alone affects the timing of seed germination. KAR alone affects the percentage of seeds that germinate. TMB alone affects the timing of seed germination. TMB alone affects the percentage of seeds tha...
Enough active enzyme is produced from one wild-type/dominant allele. Enough gibberellin is produced in the presence of one wild-type/dominant allele.
DIETARY COMPOSITION OF ORGANISMS IN AN AQUATIC ECOSYSTEM The table above shows how much each organism in an aquatic ecosystem relies on various food sources. The rows represent the organisms in the ecosystem, and the columns represent the food source. The percentages indicate the proportional dietary composition of each organism. High percentages i...
All four organisms placed on the appropriate lines All four arrows correctly drawn between organisms Hellgrammites Caddisflies Stoneflies Algae
(b) In an effort to control the number of midges, an area within the ecosystem was sprayed with the fungus Metarhizium anisopliae, which significantly decreased the midge population. Based on the data in the table, predict whether the spraying of the fungus will have the greatest short-term impact on the population of the stoneflies, the caddisflie...
Figure 1. Characteristics of a pond community over time Microcystis aeruginosis is a freshwater photosynthetic cyanobacterium. When temperatures increase and nutrients are readily available in its pond habitat, M. aeruginosis undergoes rapid cell division and forms an extremely large, visible mass of cells called an algal bloom. M. aeruginosis has...
Figure 1. Comet assay to detect double-stranded breaks in DNA comet assay is a technique used to determine the amount of double-strand breaks in DNA (DNA damage) in cells. The nucleus of an individual cell is placed on a microscope slide coated with an agarose gel. An electric current is applied to the gel that causes DNA to move (electrophoresis),...
Head (only) OR (head with) no tail. Tail will be shorter than a cell with double-stranded breaks in DNA.
Many species of bacteria grow in the mouths of animals and can form biofilms on teeth (plaque). Within plaque, the outer layers contain high levels of oxygen and the layers closest to the tooth contain low levels of oxygen. The surface of the tooth is covered in a hard layer of enamel, which can be dissolved under acidic conditions. When the enamel...
Estrogens are small hydrophobic lipid hormones that promote cell division and the development of reproductive structures in mammals. Estrogens passively diffuse across the plasma membrane and bind to their receptor proteins in the cytoplasm of target cells. (a) Describe ONE characteristic of the plasma membrane that allows estrogens to passively cr...
Hydrophobic/nonpolar Space between phospholipids (b) In a laboratory experiment, a researcher generates antibodies that bind to purified estrogen receptors extracted from cells. The researcher uses the antibodies in an attempt to treat estrogen-dependent cancers but finds that the treatment is ineffective. Explain the ineffectiveness of the antibod...
Antibodies are unable to enter the cell. (Extracellular) antibodies will not bind to (intracellular) estrogen receptors.
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This is a hybrid digital exam. Students complete multiple-choice questions and view free-response questions in the Bluebook testing app. They handwrite their free-response answers in paper exam booklets that are returned for scoring. Download a sample free-response booklet for AP Biology (.pdf).
AP ® BIOLOGY 2017 SCORING GUIDELINES. Question 8 . Estrogens are small hydrophobic lipid hormones that promote cell division and the development of reproductive structures in mammals. Estrogens passively diffuse across the plasma membrane and bind to their receptor proteins in the cytoplasm of target cells.
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AP® BIOLOGY 2019 SCORING GUIDELINES © 2019 The College Board. Visit the College Board on the web: collegeboard.org. Question 1 Figure 1. Model of two-step enzymatic plant pathway for synthesis of IAA from tryptophan Auxins are plant hormones that coordinate several aspects of root growth and development. Indole-3-acetic
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Questions 3–8 are short free-response questions that require about 6 minutes each to answer. Questions 3–5 are worth 4 points each and questions 6–8 are worth 3 points each. Read each question carefully and completely. You are advised to spend the 10-minute reading period planning your answers.
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Obtain A High Score On The AP Biology Exam With Our Practice Tests & Course. Learn faster. Stay motivated. Study smarter.
