BIOL1114 Preview Material for Exam #1 15 Sept. 2008 Use a #2 pencil to fill in the information on your NCS answer sheet. Put your OKey Account Username in the boxes indicated for LAST NAME and darken the appropriate circles. Write you r Name (Last,First) and “Star or Nostar” (as marked on your test form) in the space above the boxes containing your OKey Account Username. Darken the (S or N) in the last column of the name circles depending on your test form. Enter the number 831 and darken the corresponding circles in the first 3 columns of the “Student ID.” Failure to perform this correctly will incur a 10pt handling fee. Read all questions and answers carefully before choosing the single BEST response for each question. Feel free to ask the instructor for clarification. Recentl y, some indivi dual s claimed to have found the remains of a “Big Foot” (a large, furry humanlike creature) in Georgia, a warm southeastern US state. While taking a stroll through the north Georgia mountains, a Big Foot is chased by a pack of coon hounds. After several miles of running, Big Foot is able to lose the hounds and stops to rest and cool down. The night after being chased by the hounds, Big Foot (a hom eotherm) decided to sleep outside instead of in his cave. During the night, the temperature dropped to 25°F (a rare occurrence). Zebra m ussels are a small clamlike creature that originated in Russia and were accidentally introduced to the Great Lakes in the 1980s. This species reproduces very quickly (females can produce more than 30,000 eggs per year) and has spread rapidly causing a variety of environmental problems. In the last few years, zebra mussels hav e been reported in several locations in Oklahoma. They can become densely populated and completely cover the bottom of a stream or lake, often smothering native freshwater mussels. They can grow in thick bunches within pipes, causing blockages and problems in water intakes of municipal water supplies and electric companies. Scientists are interested in the maximum temperatures that zebra mussels can wi thstand as thi s will help them predict how far they will spread into the southern US and the types of industrial pipes in which they can live in. To test the mussel’s temperature tolerance, scientists placed them in aquariums at their optimal temperature for growth (19°C) and two higher temperatures of 25°, and 31°C. For each temperature, 20 mussels were tested. After four days, scientist counted the number of mussels that had died in each pipe. Following the experiment, the scientist noted that no mussels died at 19° and 25°C. At 31°C, all mussel s died. Zebra m ussels can survive outside of water for longer than other mussel species. Chili (hot) peppers are one of t he earliest crops to be domesticated in South America. It is suggested that the early dom estication of chili pepper is related to their ability to prevent food infection by microbes such as bacteria and fungi. Before humans used refrigeration to preserve their food, food poisoning was more common in hot regions as compared to cold regions. Scientists suggest that the production of capsaici n is a defense mechanism developed in some peppers to protect them from the fungus Fusarium that enters the fruit through punctures made in the fruit skin by insects. The fungus destroys the seeds in the fruit before they can be eaten and dispersed by birds. To test the hypothesis that capsai cin protects the seeds, scientist collected fruits from wild plants and measured both the level of capsaicin and the viability (ability to germinate) of the seeds. In order to test the role of natural sel ection in the production of capsaicin scientists collected wild chili peppers from seven different populations of the same species spread over 1,000 square miles in Bolivia. They selected peppers random ly and measured levels of capsaicin and scars caused by insect bites on the fruit surface. An experim ental site was selected at Yum a Agricultural Research Center in Arizona, to evaluate the effect of a new synthetic fertilizer on melon plant yields (the number of melons produced). Groups of ten plants were tested. One group received fertilizer treatments, while another group served as the control. Results indicated the group of melons receiving f ertilizer had an increased yield.When the Sphinx moth, Manduca sexta, flies, heat is produced by its flight muscles. When it flies at low ambient temperatures, its thorax (midsection), which is surrounded by a thick coat of scales, may be 23 o C warmer than the surrounding air. At high ambient temperatures, the moth’s abdomen (hind section) can become nearly as warm as the thorax and acts as a therm al radiator (releases heat). (http://entomology.unl.edu/ent801/temp.html) (http://www.animalcorner.co.uk/insects/moths/graphics/mothanat.jpg) Dr. Elle GentPapillion decides to test whether the scales help regulate the moths’ body temperatures by serving as an insulator. To test this, she takes a set of moths and glues their dorsal surfaces (backs) to sticks so that their legs and wings can still move. This allows her to suspend the moths in tiny air chambers where the wind f lowing past t hem stimulates them to flap their wings as if they are flying. She also inserts very tiny therm al probes into the insects to measure their internal temperatures. Then she goes about planning and conducting her experiment, which involves removing scales from half the individuals. http://www.fs.fed.us/wildflowers/pollinators/pollinatorofthemonth/images/hawkmoths/agrius_cingulata_lg.jpg Dr. GentPapillion places several moths in 18 o C air (low temperature), and makes them fly for 5 minutes. She then increases the air temperature to 30 o C (high temperature), and continues to make the moths fly. Potassium cyanide (KCN) is a common poison used by entomol ogists like Dr. GentPapillion to kill insects for collections. One observes that O2 use stops immediately when insects are exposed to KCN. Near a gold mining operation, where KCN is used to extract gold from ore, a populati on of bacteria has become tolerant KCN in the