lOMoARcPSD 3454541 Exam Fall 2013 questions and answers Academic Support For Biog 1440 Physiology Cornell University StuDocu is not sponsored or endorsed by any college or university Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 Exam 2 Fall 2013 BioG 1440 Comparative Physiology Fall 2013 Exam 2 Filling out your answer sheet 1 Please use a 2 pencil only on the optical scan answer sheets Fill in circles completely and avoid darkening areas outside the circles Erase carefully and completely please 2 For the individual exam legibly PRINT your last and first names at the top of the sheet 3 In the appropriate boxes write your Cornell Student ID number and your study group number 1301 1350 You may leave the section number information blank 4 Carefully fill in the circles under the numbers you just wrote Please note that these numbers will identify you so be careful not to make any errors 5 Answer the demographic questions below using the bubbles in the upper right section of the answer sheet 6 Do not turn past the third page of this packet or begin working on the exam until instructed to do so Demographic Questions Please answer the following questions to help us evaluate your preparation for this course Fill in your answer to these questions in the upper right portion of your answer sheet D1 How well prepared do you think you are for this exam A pretty well prepared C moderately well prepared E no well prepared D2 How useful is your study group in preparation for the individual exam A very useful C moderately useful E not useful D3 Have you changed your study habits since the first exam A no B yes D4 Did you look at the Strategies for Success in BioG 1440 document A no B yes D5 Have you been using the Learning Objectives regularly to guide your reading and studying A regularly B often C sometimes D occasionally E never Instructions for the Individual Exam There are a total of 41 true false questions on this exam You should assume that any bold text that precedes a question is correct information that you may need to evaluate the statement s that follow You will have 60 1 Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 Exam 2 Fall 2013 minutes to complete the individual exam If you finish before the allotted 60 minutes you will need to remain in your seat until told to turn in your exam For all questions T true F false Each question is worth one point In addition to filling out the answer sheet you should also circle your answers on these pages so you can use them in the group exam and take them home to check against the answer key that will be posted in the Exams folder after the conclusion of the group exam You are strongly encouraged to draw diagrams or models to help you understand what the question is asking and aid in determining the correct answer Instructions for the Group Exam 1 One student from each group will be instructed to come to pick up an answer sheet for the group 2 Leave the name ID number and section number areas blank ONLY fill in the study group and the circles below 3 At the bottom of the sheet print the first and last names of each member of the group Print legibly and make sure the writing does not interfere with the answer circles above 4 You will have 30 minutes to complete the group exam 5 When you are done with the group exam you may turn in your answer sheet and leave the exam room Do not turn to the next page until told to do so Plexers are word puzzles in which common words or phrases are suggested by the spatial relationship between words letters or numbers This one is easy Helix Helix double helix How about this one Gibraltar caught Cornell Answer on last page of exam but don t look until you have completed the exam 2 Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 Exam 2 Fall 2013 A protein phosphatase is an enzyme that removes a phosphate group from a protein while a protein kinase transfers a phosphate group from ATP to a protein Both protein kinases and phosphatases are common to many signal transduction pathways STP While the activity of the kinase is turned on or off by the signaling pathway the phosphatase is usually active all the time Because of this 1 signaling proteins that are phosphorylated by a kinase will not remain phosphorylated for very long T F 2 mutations that block the function of a kinase in an STP will have the same phenotype s as mutation that block the function of a phosphatase in the same STP T F 3 phosphatases provide a mechanism for turning off steps in a signaling pathway when the signal is no longer present T F The rate and depth of breathing in humans is controlled by a receptor in the medulla of the brain The receptor senses changes in CO 2 concentration in the blood and cerebrospinal fluid via changes in pH A mutation in this receptor protein results in the inability of an individual to increase the rate or depth of breathing in response to increasing blood CO2 The mutation results in a single amino acid change between the wild type and the mutant 4 The phenotype of the mutant protein is consistent with the replacement of an amino acid with an acidic or basic R group in the wild type receptor with a polar amino acid in the mutant receptor T F 5 A mutation in one of the proteins in hemoglobin that prevents H binding could result in a similar mutant phenotype as the single amino acid change in the receptor that controls breathing T F Quorum sensing is a mechanism by which bacteria communicate with one another and is used to detect the population of other bacteria around them 6 The production of the signaling molecule used in quorum sensing by a single bacterium varies depending on how many bacteria of the same species are nearby T F 3 Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 Exam 2 Fall 2013 Compared to the vast number of proteins that function in signal transduction pathways the number of second messengers is relatively small However each of these second messengers is known to function in many different signaling pathways For example Ca2 ions are known to function in nearly 40 of signaling pathways in eukaryotic cells 7 The ability of Ca2 to function in many signaling pathways and yet maintain the specificity of each pathway is explained by the presence of many independent pools of Ca2 ion in a cell T F 8 In order for a second messenger to meet the on off requirement of every step in a signal transduction pathway the