lOMoARcPSD 3454541 Exam 4 March 2016 questions and answers 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 Name Prelim 1 BioG 1440 SP16 March 4 2016 Total pages in exam including cover 7 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 3 Record answers to all multiple choice questions on the bubble sheet in pencil or pen 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 Day and Time of your section Adam Bisogni Matt Lewis David Peck Adrian Powell Fahad Raza Glenn Stamps All multiple choice is worth 3 pts and all short answers are worth 4 pts possible 70 points total Q15 Q16 Q17 Q18 Q19 Q20 Q21 SA 1 Downloaded by yelena radutskaya radutskaya yahoo com MC Total lOMoARcPSD 3454541 Name Multiple Choice The following two 2 questions refer to the figure below glucose 1M Sucrose 1M CaCl2 1M Glucose 2M The solutions in the two arms of this U tube are separated by a membrane that is permeable to only water and glucose Side A is half filled with a solution of 1M glucose and 1 M CaCl2 Side B is half filled with 1M Sucrose and 2M glucose Initially the liquid levels on both sides are equal 1 Initially in terms of tonicity the solution in side A is with respect to the solution in side B a hypotonic b isotonic c saturated d hypertonic e I don t know man 2 After the system reaches equilibrium what changes are observed a The molarity of glucose on side A is lower than that of glucose on side B b The water level is higher in side A than in side B c The water level is unchanged d The water level is higher in side B than in side A e None of the above 3 Lipid bilayers are considered barriers to the diffusion of charged molecules Which of the following statement correctly explains why this is true a Charged molecules are lipophobic b Charged molecules are lipophilic c Charged molecules are hydrophobic d Charged molecules are only permeable to lipid bilayers via active transport e None of the above 2 Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 Name 4 Which of the following must exist at electrochemical equilibrium a The total solute concentration is equal on both sides of the membrane b The total number of charges is equal on both sides of the membrane c The concentration of each individual ion charged solute is equal on both sides of the membrane but the concentrations of non charged solutes may vary d The number of positive and negative charges are equal on both sides of the membrane e None of the above statements is true 5 Which of the does not affect Vmax a An increase in temperature b Decreasing or increasing the concentration of the enzyme c Adding a molecule that binds to the enzyme s substrate binding site d Increasing substrate concentration e All of the above affect Vmax 6 Lactate dehydrogenase is an enzyme which mediates the following reaction The concentrations of which compounds will affect the speed of the net reaction depicted above a Lactic Acid NAD Pyruvic Acid NADH H Lactate dehydrogenase b Lactic Acid NAD Lactate dehydrogenase c Pyruvic Acid NADH H Lactate dehydrogenase d Pyruvic Acid NADH Lactate dehydrogenase e Lactic Acid NAD Pyruvic Acid NADH H 7 Which of the following is not true about mitochondria a They are necessary in all cells because ATP is not stored b They produce ATP by diffusion of protons c They are derived from proteobacteria d They are required to produce ATP from glucose e They produce heat by biochemical inefficiency 8 Which of the following processes take place in the cytosol of cells a Fermentation b The Krebs cycle c Glycolysis d a and c e b and c 3 Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 Name 9 In the graph shown at the right the slope of the plot of log mass versus log metabolic rate is the same for all organisms about However the line for ectotherms is displaced downward compared to the line for endotherms The most reasonable explanation for this displacement is that a ectotherms are typically smaller than endotherms b ectotherms obtain heat only from their environment c endotherms rely more on metabolism as a source of heat c metabolic regulation of body temperature requires a lower metabolism than behavioral regulation of body temperature d smaller organisms have a larger surface to volume ratio and lose more heat 10 Long distance athletes often talk of hitting the wall approximately 1 5 to 2 hours into their run as their muscles switch from a anaerobic glycolysis to aerobic catabolism with glycogen b phosphagen use to anaerobic glycolysis c aerobic catabolism with glycogen to aerobic catabolism with lipids d aerobic catabolism with lipids to aerobic catabolism with glycogen e glycolysis to fermentation 11 You and your endothermic friends head to the beach for Spring Break and lay down on a towel on the hot sand under the shade of a large umbrella You will gain most of your heat from a Radiation from the sun b Conduction from the hot sand c Convective current of a cool breeze d Evaporation through sweat e Your body s metabolism 12 Why is Professor Gilbert better able to regulate his body temperature in the winter than Professor Booker a He has a greater mass b He has a lower ratio of surface area to volume c He has a higher ratio of surface area to volume d a and b e a and c 13 In an animal s thermal neutral zone its BMR stays the same even though Ta may be less than Tb Which property does an animal NOT change to regulate heat loss in this situation a thermal conductance b erection of body hair c evaporation by sweating d body posture e vasoconstriction 4 Downloaded by yelena radutskaya radutskaya yahoo com lOMoARcPSD 3454541 Name 14 Assume that the temperature coefficient of a physiological process was calculated as a Q5 instead of Q10 If the rate of activity of an enzyme was 40 at 37 C and the Q5 was 2 0 what would the rate be at 27 C a 5