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ap08_biology_sgs - AP Biology 2008 Scoring Guidelines The...

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AP ® Biology 2008 Scoring Guidelines 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 5,400 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. © 2008 The College Board. All rights reserved. College Board, AP Central, Advanced Placement Program, AP, 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. 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 online home for AP teachers: apcentral.collegeboard.com.
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AP ® BIOLOGY 2008 SCORING GUIDELINES Question 1 1. The physical structure of a protein often reflects and affects its function. (a) Describe THREE types of chemical bonds/interactions found in proteins. For each type, describe its role in determining protein structure. (6 points; 1 point for bond/interaction description, 1 point for description of role) Bond/interaction Description Role associated to bond/interaction Covalent/ peptide sharing electrons OR linking amino acids together amino acid sequence OR primary structure (no credit for chain or polypeptide alone) Disulfide/ covalent disulfide, S–S bond (bridges); sulfur-containing R group bonding tertiary or quaternary structure Hydrogen H–O or H–N interactions α helix, β sheet; secondary, tertiary, or quaternary structure van der Waals unequal electron clouds in R group; dipole moments tertiary or quaternary structure Hydrophobic nonpolar R groups tertiary or quaternary structure Ionic charged R groups tertiary or quaternary structure (b) Discuss how the structure of a protein affects the function of TWO of the following. (3 points maximum) Muscle contraction (1 point for each bullet; 2 points maximum) Actin (thin filaments) and myosin; cross-bridges OR filamentous proteins slide past each other. Troponin/tropomyosin interaction blocks binding of myosin to actin.
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