B265FT1S05 - 1 5/4/05 9:14 AM Biology 265 Spring 2005 First...

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Unformatted text preview: 1 5/4/05 9:14 AM Biology 265 Spring 2005 First Test Form 0 1. In muscle, when oxygen is limiting the end product of metabolism is a. lactate b. alcohol c. pyruvate d. water 2. In brown adipose tissue a. the H+ gradient in the inner mitochondria is increased b. more ATP is generated per mole of glucose metabolized c. thermogenin provides and ion channel in the inner membrane for H+ movement d. all of the above 3. Large animals consume more oxygen per gram animal than small animals do. a. true b. false 4 .An animal with a temperature of approximately 300 o K will radiate a. red visible light, 700 nm b. UV light less than 200 nm c. infra red radiation 10,000 nm d. radio waves greater than 100,000 5. Which ion assists in the absorption of sugars by the small intestine ? a. Sodium b. chloride c. Potassium d. Calcium 6. Which class of foods is partially digested in the stomach ? a. fats b. carbohydrates c. proteins 7. Which class of foods is transported from the intestine directly into the lymphatic fluid a. amino acids b. sugars c. fats d. sugars and fats e. amino acids and fats 8. What is the pH of the small intestine ? a. 3.0 b. 8.5 c.7.5 d. 12 9. What does the Km tell us about an enzyme ? a. the max rate of turnover of reactant to product b. the thermal stability of the reaction c. the energy of activation of the reaction d. the affinity of the enzyme for its substrate 10.The average kinetic energy of a population of molecules increases 2-3% for every 10oC . How does this change the energy of activation needed by these molecules for a reaction ? a. there is no change in the energy of activation b. the energy of activation must be 2-3% greater c. the energy of activation must be 2-3% less d. the energy of activation doubles 11. The respiratory quotient represents a. carbon dioxide produced divided by oxygen consumed b. oxygen consumed divided by carbon dioxide produced c. the rate of heat liberated to calories contained d. the rate of oxygen consumed to heat liberated 12. Specific dynamic action refers to a. the rate of heat produced by resting metabolism b. the increase in oxygen consumption that occurs after eating c. the change in metabolic rate from resting to active exercise d. the ratio of the metabolic rate in a large organism vs a small organism 13. How many carbon atoms are there in a molecule of pyruvate a. one b. two c. three d. four 14. NADH is a product of lactic acid fermentation a. true b. false Match a. Gall bladder http://mscserver.cox.miami.edu/BIL265052/t1.htm Page 1 of 6 1 5/4/05 9:14 AM b. stomach c. pancreas d. small intestine e. liver 15. Releases billirubin to the general digestive tract --a 16. Releases bicarbonate-- c 17. Releases salts for emulsification--a 18 Absorbs alcohol and aspirin --b 19 Secretes gastrin--b 20. Secretes cholycystokinin (CCK) --d 21. The inside epithelial layer of the digestive tract that forms villi and rugae a. submucosa b. mucosa c. serosa d. sub serosa 22. Chylomicrons are used in the absorption of a. fatty acids b. amino acids c. trisaccharides 23. Cells of the stomach that release HCl a. ECL cells b. chief cells c. parietal cells d. all of these d. mucosal cells 24. For an animal muscle cell, or nerve cell, which statement is true a. sodium concentration inside is greater than outside b. potassium concentration inside is greater than outside c . both sodium and potassium are higher outside d. both sodium and potassium are higher inside 25. The most common membrane lipid in animal cells is a. phosphatidyl choline b. inositol phosphate c. sphingomyelin d. aracadonic acid 26. If a cell is in Donnan Equilibrium, with respect to potassium and chloride a. the cell will be negative inside b . the concentration of potassium will be higher inside than outside c. the concentration of potassium inside will equal that of protein anions and chloride d. all of the above 27. If Rubner was correct and surface/volume ratio controlled metabolic rate then a. metabolic rate = constant X body mass .75 b. metabolic rate = constant x body mass .67 c. metabolic rate = constant X body mass 1 .0 d. there would be no universal relationship between mass and metabolic rate 28 At 20oC a mouse has a breathing rate of 25 breaths/minute . If the Q10 of the reaction is 2.4, what is the breathing rate at 10o C ? a. 27.4 breaths/minute b. 10.4 c. 15 d. 22.6 29. Which of the following are affected by temperature ? (Assume that the products, reactants and enzymes are increased or decreased by the same amount). a. the rate of a reaction b. the direction of a reaction c. the energy of activation of a reaction d. a and b e. a and c 30. What is the most effective means of cooling for a mammal ? a. conduction b. convection c. evaporation d. radiation 31. In addition to enzyme activity, what other biochemical parameter is m ost affected by temperature change at biological temperatures ? a . membrane fluidity b. ATP production c. blood viscosity d. all of these 32. If a graph of the rate of transport vs the substrate concentration is linear and does not displays Michaelis Menton saturation kinetics. The mode of movement is a. active transport b. facilitated diffusion c. straight diffusion d. cotransport 33. It is 40oC in the shade and a dog’s body is 37oC. the dog is panting and sweating and loosing 10 mls of water per hour in evaporation. How many calories are lost in evaporation per hour ? a. 10 calories per hour b. 5840 calories per hour http://mscserver.cox.miami.edu/BIL265052/t1.htm Page 2 of 6 1 5 /4/05 9:14 AM c,. 840 calories per hour d. it depends on how much the dog weighs 34. Which of the following is true ? a. in poikilotherms the Km of an enzyme is constant over a wide range of temperatures b. At 15 oC the Km of a fish adapted to 10oC is higher that that of a warm adapted fish c. in mammals, the Km of an enzyme shows seasonal variation d. all are true Rate Substrate Concentration 35. Which shows an enzyme with the highest affinity for its substrate ? a. A b. B c. C d. A and B e. A and C 36. Which shows the highest possible reaction velocity ? a. A b. B c. C d. A and C e. A and B In the graph above Tb is the body temperature of the animal and Ta is the temperature of the environment, LCT is the lower critical temperature and UCT is the upper critical temperature. 37. For the ground hog, lower critical temperature of 17C and an upper critical temperature of 25. Does the metabolic rate fall below 17oF a. yes b. no c. impossible to tell from this data 38. If animal’s body temperature is 25 oC. What happens ? a. the animal generates heat in metabolism that must be dissipated http://mscserver.cox.miami.edu/BIL265052/t1.htm Page 3 of 6 1 5/4/05 9:14 AM b. the animal absorbs a lot of heat from the environment c. the metabolic rate begins to increase d. A and B e. A and C 39. Lactate dehydrogenase acts as a branchpoint enzyme to regulate movement of carbon skeletons into fermentation or the Krebs cycle. Which of the following statements is true ? a. LDH of the heart is inhibited at high concentrations of pyruvate b. LDH of muscle has a lower affinity for pyruvate that that of the heart c. LDH of muscle shows a straight Michaelis Menton hyperbolic graph d. all are true e. all are false C D A B 40. Gastrin --C 41. Gastro intestional peptide--D 42. CCK--A 43. Secretin --B 44. Which of the following acts as an intracellular oxygen storage molecule in muscle ? a. hemoglobin b. creatine phosphate c . myoglobin d. ADP 45. Which compound is regenerated in fermentation, so that glycolysis can continue ? a. NAD b. ADP c. NADH d. ATP Name _____________________________________________ Student Number _____________________________________ http://mscserver.cox.miami.edu/BIL265052/t1.htm Page 4 of 6 1 5/4/05 9:14 AM A B 46. What is the observed slope of line A (log of the whole animal metabolic rate) ? a. 1.0 b. .75 c . .67 d. .70 47-50 What theories explain why metabolic rate varies with size ? Name ______________________________________________________ Student Number ______________________________________________ http://mscserver.cox.miami.edu/BIL265052/t1.htm Page 5 of 6 1 5 /4/05 9:14 AM 44-46 Graph the log of the metabolic rate/ kg vs animal mass. What is the slope of the line ? 47-50. Graph the average oxygen consumption vs temperature. What equation describes this relation. ? http://mscserver.cox.miami.edu/BIL265052/t1.htm Page 6 of 6 ...
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This document was uploaded on 11/04/2011 for the course BIL 265 at University of Miami.

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