LS1W09Exam1AKey

LS1W09Exam1AKey - LS1 Winter09 Name ID VERSI ON A Dont open your ex am until instructed to Write y our name and student number on every page of the

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LS1 Winter09 Name & ID________________________________ Page 1 of 9 VERSION A • Don’t open your exam until instructed to. • Write your name and student number on every page of the test before handing in the test (you will lose 10 points if you don’t!). Use a pencil on the multiple choice, and a pen on the short answer. • Mark scantrons neatly, one answer per question. Erase changes completely. • Answer written questions in space provided. Do not write on the back. Only answers on the front side of pages will be graded. NO EXCEPTIONS. If you must cross something out and run out of space to answer the question in the space provided, you must request another blank exam page. Absolutely no electronic devices at your desk. No food, no bottle with labels. Use a pencil on the multiple choice, and a pen on the short answer. If you need to use the restroom, turn in your exam to a TA. Only one student may leave the room at a time. You may not leave the room with any electronic devices. Circle which TA & Section you are in o 1A, 1E, 1H – HILTON YAMAGUCHI o 1B, 1F, 1G – ASIF RAZEE o 1D, 1J, 1L – RAUL SEDANO o 1C, 1I, 1K – JONATHAN SIM • Good luck! I hereby certify that I have neither given nor received any aid on this exam, and that I have read and understand the instructions above. Sign your name here:_____________________________________
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LS1 Winter09 Name & ID________________________________ Page 2 of 9 PUT YOUR NAME ON EVERY PAGE OF THE EXAM BEFORE STARTING. Exam is 200 pts total Part 1 Multiple Choice. 25 questions, 5 pts each 1. Background extinction … a. has occurred a number of times in Earth’s history, most recently 65 million years ago b. is a low, constant rate of natural extinction c. is an unnatural process caused by human activities d. is caused by environmental catastrophes e. results from short periods of rapid climate change 2. Parasitic species tend to have simple morphologies. Which of the following statements best explains this observation? a. Parasites are lower organisms b. Parasites do not live long enough to inherit acquired characteristics c. Simple morphologies are the result of natural selection for most parasites d. Parasites have not yet had time to progress because they are young evolutionarily 3. A volcano eruption decimates a population of snakes in Hawaii. The surviving population has broader stripes than the population prior to the eruption, even though stripes have influence on surviving a volcanic eruption. If stripe width is genetically determined, what effect has the snake population experienced? a. Genetic bottleneck b. Directional selection c. Disruptive selection d. Gene flow 4. Three-spined stickleback fish, show heritable variation in the length of their gill rakers (little projections on the gill that can aid in catching small prey). Fish caught in open water (away from shore) tend to have longer gill rakers and eat different food than sticklebacks caught in shallow water. Longer gill rakers function better in capturing the
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This note was uploaded on 06/03/2011 for the course LS 1 taught by Professor Thomas during the Spring '05 term at UCLA.

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LS1W09Exam1AKey - LS1 Winter09 Name ID VERSI ON A Dont open your ex am until instructed to Write y our name and student number on every page of the

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