Exam 3_Spring 2011A_KEY

Exam 3_Spring 2011A_KEY - Fill out your scantron answer...

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Fill out your scantron answer sheet : Write in and bubble in your name and PID number. You may write on this and YOU MAY KEEP IT! You will only be able to see your score later, so to know how you answered a specific question, keep track of your answers on these sheets too. NOTE: You will only be able to see your score at onyen.unc.edu. ***SEQUENCE NUMBER 888888 1. During a population increase, the 1) birth rate decreases and the death rate decreases 2) birth rates and death rates increase 3) birth rates and death rates remain constant 4) birth rate decreases and the death rate increases. 5) birth rate remains constant and the death rate decreases 2. An ecologist hypothesizes that predation by a particular owl species is the major factor controlling the population of a particular rabbit species. If this hypothesis is correct, which of the following population effects could be expected ? 1) A fall in the owl population should cause a fall in the rabbit population 2) A fall in the rabbit population should cause an increase in the owl population 3) An increase in the incidence of disease in the rabbit population should not change the owl population 4) an increase in the owl population should cause a fall in the rabbit population. 5) an increase in the rabbits’ food supply should not change the owl population 3. What is unique about blood in pulmonary arteries compared with blood in other arteries? 1) there is no hemoglobin 2) it is moving away from the heart 3) it is moving towards the heart 4 ) it has a high concentration of carbon dioxide 5) it has a high concentration of oxygen 4. The Siberian Husky is a dog, with strong pectoral and leg muscles, allowing it to move through dense snow. The Siberian Husky is well designed for working in the snow. If the Siberian Husky had heavier muscles, it would sink deeper into the snow, so they would move slower or would sink and get stuck in the snow. Yet if the Siberian Husky had lighter muscles, it would not be strong enough to pull sleds and equipment, so the dog would have little value as a working dog. This is a good example of: 1) balancing selection 2) stabilizing selection 3) homeostasis 4) directional selection 5) disruptive selection 5. If the epithelial surface area of the large intestines in humans was reduced, what would likely be the outcome? 1) nutrient absorption would be decreased 2) nutrient absorption would be increased 3) constipation 4) less digestive enzymes would be produced 5) the stool would be watery Use this information for the next two questions: A population of 1,000 individuals has 50 births and 40 deaths in 1996. There is no immigration or emigration and the population is not at carrying capacity. 6. What is r?
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Exam 3_Spring 2011A_KEY - Fill out your scantron answer...

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