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Unformatted text preview: on of a change in graph or a change in the relationship between productivity and depth from spring graph to mid-summer graph. Explanation of a plausible prediction of a shift in the graph must be tied to a valid or plausible reason. © 2008 The College Board. All rights reserved. Visit the College Board on the Web: www.collegeboard.com. AP® BIOLOGY 2008 SCORING GUIDELINES
3. Regulation is an important aspect of all biological processes. For FOUR of the following processes, describe the specific role of the regulator and discuss how the process will be altered if the regulation is disrupted. SCORING RUBRIC FOR EACH PROCESS (1 point per bullet; 3 points maximum per process) Role of regulator (2 points) • Cause and effect • Effecting mechanism How process is disrupted (2 points) • Increase in regulator • Decrease in regulator Cell Cycle/Cyclin Role of regulator • Allows cell cycle to proceed OR get past checkpoint from one phase to next: G1, S, G2 • Works/combines with Cdk, S-phase, MPF, APC; OR how concentration fluctuates How process is disrupted • Decrease in cyclin: no mitosis/not past checkpoints/G1, cell in G0; examples: nerve and muscle cells • Increase in cyclin: cancer/uncontrolled growth/cell division Metabolic Rate/Thyroxine Role of regulator • Stimulates/increases metabolic rate • Discuss negative feedback, TSH OR hypothalamus-releasing hormone—anterior pituitary— TSH OR metamorphosis in frog OR conversion T4 → T3 discussion How process is disrupted • Decrease in thyroxine: weight gain, lethargy, no negative feedback (altered), hypothyroidism, osteoporosis OR decrease in iodine: decrease in thyroxine—goiter • Increase in thyroxine: weight loss, increase in heart rate, increase in blood pressure, hyperthyroidism, Grave’s disease Ovarian Cycle/FSH Role of regulator • Stimulates maturation/development of follicle/egg OR stimulates estrogen production OR leads to (not causes or tri...
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This note was uploaded on 11/23/2009 for the course BIOLOGY 1101 taught by Professor Keith during the Winter '05 term at The University of Oklahoma.
- Winter '05