lOMoARcPSD 3454541 Sample practice exam 4 March 2015 questions Introductory Biology Comparative Physiology Cornell University StuDocu is not sponsored or endorsed by any college or university Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 Prelim 1 BioG 1440 February 25 2011 Total pages in exam including cover WATCH YOUR TIME This is a 50 minute test Name Student ID By signing below I acknowledge that I am abiding by Cornell University s Code Signature PLEASE 1 WRITE YOUR NAME on all pages of the exam 2 Be sure to fill out your full name and your 7 digit cornell ID on the scantron sheet in pencil 3 Record answers to all multiple choice and true false questions on the scantron sheet in pencil and directly on the exam in pen 4 Write legibly If we cannot read your answer we WILL NOT grade it 5 Use only the space provided Answers provided outside of space provided will not be graded 6 Do NOT use calculators or any other electronic devices 7 Write down the time your discussion section meets and circle the name of your TA Time Sam Dillon Nirav Patel Jonathan Fuller Katie White Sabrina Guarino Multiple choice 21 pts Short answer Page 5 8 pts True False 12 pts Page 6 4 pts Page 7 12 pts Page 8 4 pts Total Score 1 Downloaded by yelena radutskaya radutskaya yahoo com out of 61 lOMoARcPSD 3454541 MULTIPLE CHOICE 3 points each For each of the following questions please choose the SINGLE BEST answer and then record answers to all multiple choice and true false questions on the scantron sheet in pencil and directly on the exam in pen 1 You are sitting beside a woodstove whose surface temperature is 327 C and you are wondering how its rate of heat loss through thermal radiation compares to that from the back of your hand which has a surface temperature of 27 C Knowing that 0 K 273 C and knowing how the rate of thermal radiation increases with surface temperature you calculate the relative rates of heat transfer per square cm from the stove and from your hand The rate for the hot stove is higher than that for your warm hand by a factor of a 2 b 4 c 8 d 16 e 64 2 Which of the following statements regarding maximal rate of oxygen consumption VO2 max is FALSE a It determines the peak rate at which an animal can produce ATP b It differs among individuals within a species as well as between species c It provides a means by which to predict what aerobic activities an individual can perform for more than a few minutes d It determines how quickly an animal can cover large distances because it determines the animal s maximum sustained speed e Among Olympic athletes it is probably lower for weight lifters than for basketball players 3 Which item below is NOT a means for reducing the loss of heat from an endothermic animal to a cold environment a Vasoconstriction of arterioles leading to capillaries just under the skin b Having a thick layer of fat associated with the skin c Using a counter current system to help retain heat in the body core d Creating more internal heat in brown fat areas of the body e Fluffing up feather or hair Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 4 The longer the distance you run your body will progress through the various mechanisms for producing ATP in the following order a Phosphagens anaerobic glycolysis aerobic catabolism with lipids aerobic catabolism with glucose and glycogen b Anaerobic glycolysis phosphagens aerobic catabolism with lipids aerobic catabolism with glucose and glycogen c Phosphagens anaerobic glycolysis aerobic catabolism with glucose and glycogen aerobic catabolism with lipids d Anaerobic glycolysis aerobic catabolism with lipids aerobic catabolism with glucose and glycogen phosphagens 5 Epithelial sheets are a common feature of multicellular organisms What feature determines whether a molecule is transported via the paracellular path a The presence of microvilli on the apical surface of the epithelial sheet b The degree of saturation of the membrane phospholipids c The size of the molecule d The density of transporter proteins associated with the tight junctions e Both c and d are correct 6 You are studying the role of the enzyme Cornellase in catalyzing a newly discovered metabolic reaction You have isolated an unknown molecule Y that your data suggests influences the reaction mediated by Cornellase Your data reveals that Y does not directly interact with the substrates or reactants involved in the reaction in the presence of Y increasing the concentration of the substrate S results in an increase in the reaction velocity Vmax is not affected by presence of Y the Km of the reaction mediated by Cornellase increases in presence of Y Given these results what best describes the role of Y in regulating the reaction Y and Cornellase are isozymes b Y is an allosteric inhibitor of Cornellase c Y is an allosteric activator of Cornellase d Y is a second enzyme that alters the structure of Cornellase e Both b and d are acceptable options a Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 7 The figure below represents the distribution of charged solutes ions across a cell membrane Which statement concerning this figure best explains what you see The cell membrane plays a key role in determining the distribution of the charges in the bulk solution b The overall net charge in the bulk solution of the cytoplasm is negative c In the extracellular bulk solution the diffusion of an ion is determined by both the electrical and chemical gradients d The distribution of charged ions close to the membrane is determined by the charged polar heads of the membrane phospholipid molecules e None of the above statements is true a TRUE FALSE 2 points each Indicate whether each of the following statements is True a or False b 8 T F Enzyme A has a higher affinity for substrate X than enzyme B Therefore it will also have a higher Vmax than enzyme B 9 T F Lipids typically use protein transporters to cross the cell membrane 10 T F The oxygen atoms in the oxygen molecules that we inhale for aerobic metabolism leave our bodies in the carbon dioxide molecules that we exhale Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 11 T F Fish lack good insulation feathers or fur and this is why they are nonthermoregulating ectotherms 12 T F A blood transfusion can boost the maximal rate of oxygen consumption of an athlete 13 T F A thermoregulating endotherm does NOT need to change its rate of