2007 Form B - AP® Biology 2007 Free-Response Questions...

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Unformatted text preview: AP® Biology 2007 Free-Response Questions Form B The College Board: Connecting Students to College Success 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 association is composed of more than 5,000 schools, colleges, universities, and other educational organizations. Each year, the College Board serves seven million students and their parents, 23,000 high schools, and 3,500 colleges through major programs and services in college admissions, guidance, assessment, financial aid, enrollment, and teaching and learning. Among its best-known programs are the SAT®, the PSAT/NMSQT®, and the Advanced Placement Program® (AP®). 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. © 2007 The College Board. All rights reserved. College Board, Advanced Placement Program, AP, AP Central, SAT, and the acorn logo are registered trademarks of the College Board. PSAT/NMSQT is a registered trademark of the College Board and National Merit Scholarship Corporation. 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. 2007 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. Without adaptive behaviors, animals would not survive. (a) Describe what innate and learned behaviors are. Explain the adaptive value of each of these two categories of behavior to an individual animal. (b) During mating season, male snakes exhibit tracking behavior when they follow chemical pheromone trails deposited on the ground by females. Design a controlled experiment to determine whether a male garter snake will track only a female of his species or will also follow the female of a related species. 2. The defenses of the human body to the entry and establishment of a pathogen (disease-causing organism) can be divided into nonspecific responses and specific responses. (a) Explain how THREE types of nonspecific defenses can prevent the entry and/or establishment of a pathogen in a person’s body. (b) Discuss how the immune system responds to an initial pathogenic exposure, and how this initial exposure can lead to a quicker response following a second exposure to the same pathogen. (c) Explain the biological mechanisms that lead to the rejection of transplanted organs. © 2007 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for students and parents). GO ON TO THE NEXT PAGE. -2- 2007 AP® BIOLOGY FREE-RESPONSE QUESTIONS (Form B) 3. A molecule of messenger RNA (mRNA) has just been synthesized in the nucleus of a human cell. (a) What types of modifications may occur to this RNA before it leaves the nucleus? (b) Once in the cytoplasm, how is the mRNA translated to a protein? (c) If the cell is a secretory cell, how is the protein from part (b) eventually targeted, packaged, and secreted to the exterior of the cell? 4. The energy flow in ecosystems is based on the primary productivity of autotrophs. (a) Discuss the energy flow through an ecosystem and the relative efficiency with which it occurs. (b) Discuss the impact of the following on energy flow on a global scale. • Deforestation • Global climate change STOP END OF EXAM © 2007 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for students and parents). -3- ...
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