Unformatted text preview: AP® Biology 2010 Free-Response Questions Form B The College Board
The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the College Board is composed of more than 5,700 schools, colleges, universities and other educational organizations. Each year, the College Board serves seven million students and their parents, 23,000 high schools, and 3,800 colleges through major programs and services in college readiness, college admission, guidance, assessment, financial aid and enrollment. Among its widely recognized programs are the SAT®, the PSAT/NMSQT®, the Advanced Placement Program® (AP®), SpringBoard® and ACCUPLACER®. The College Board is committed to the principles of excellence and equity, and that commitment is embodied in all of its programs, services, activities and concerns. © 2010 The College Board. College Board, ACCUPLACER, Advanced Placement Program, AP, AP Central, SAT, SpringBoard and the acorn logo are registered trademarks of the College Board. Admitted Class Evaluation Service is a trademark owned by the College Board. PSAT/NMSQT is a registered trademark of the College Board and National Merit Scholarship Corporation. All other products and services may be trademarks of their respective owners. Permission to use copyrighted College Board materials may be requested online at: www.collegeboard.com/inquiry/cbpermit.html. Visit the College Board on the Web: www.collegeboard.com. AP Central is the official online home for the AP Program: apcentral.collegeboard.com. 2010 AP® BIOLOGY FREE-RESPONSE QUESTIONS (Form B) BIOLOGY
SECTION II Time— 1 hour and 30 minutes Directions: Answer all questions. Answers must be in essay form. Outline form is not acceptable. Labeled diagrams may be used to supplement discussion, but in no case will a diagram alone suffice. It is important that you read each question completely before you begin to write. Write all your answers on the pages following the questions in the goldenrod booklet. 1. Biological molecules can be separated by using chromatographic techniques. The diagram above shows the separation of several spinach leaf pigments by paper chromatography. Using the diagram above (a) Explain how paper chromatography can be used to separate pigments based on their chemical and physical properties. (b) Discuss the role of pigments both in capturing light energy and in converting it to the chemical energy of ATP and NADPH. (c) Use the ruler shown above to determine the Rf value of xanthophyll. Show your calculations. © 2010 The College Board. Visit the College Board on the Web: www.collegeboard.com. GO ON TO THE NEXT PAGE. -2- 2010 AP® BIOLOGY FREE-RESPONSE QUESTIONS (Form B)
2. Certain human genetic conditions, such as sickle cell anemia, result from single base-pair mutations in DNA. (a) Explain how a single base-pair mutant in DNA can alter the structure and, in some cases, the function of a protein. (b) Explain, using a specific example, the potential consequences of the production of a mutant protein to the structure and function of the cells of an organism. (c) Describe how the frequency of an allele coding for a mutant protein may increase in a population over time. 3. Bacteria play central biological roles. (a) Bacteria may act as =producers =parasites =mutualistic symbionts =decomposers Select THREE of the ecological roles above. For each one you choose, describe how bacteria carry out the role and discuss its ecological importance. (b) Explain how bacteria can be altered to make genetically engineered products. 4. On a trip to a dense forest, a biologist noticed that millipedes (small invertebrates) were plentiful under logs but were rarely seen in any other location. (a) Propose THREE environmental variables (two abiotic and one biotic) that could explain why millipedes are found more frequently under logs. (b) For ONE of the abiotic environmental variables you chose above, design a controlled experiment to test a hypothesis that this factor affects the distribution of millipedes on the forest floor. Describe data that would support your hypothesis. (c) Suppose that you were examining the distribution of a plant, instead of the millipede. Describe modifications in the experiment that you designed in (b) that would be required to determine whether the abiotic factor you chose affects the distribution of the plant. END OF EXAM © 2010 The College Board. Visit the College Board on the Web: www.collegeboard.com. -3- ...
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