Digestive and Excretory Systems Test w. solutions

Digestive and Excretory Systems Test w. solutions - BIOLOGY...

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BIOLOGY TOPICAL: Digestive and Excretory Systems Test 1 Time: 21 Minutes* Number of Questions: 16 * The timing restrictions for the science topical tests are optional. If you are using this test for the sole purpose of content reinforcement, you may want to disregard the time limit.
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MCAT 2 as developed by DIRECTIONS: Most of the questions in the following test are organized into groups, with a descriptive passage preceding each group of questions. Study the passage, then select the single best answer to each question in the group. Some of the questions are not based on a descriptive passage; you must also select the best answer to these questions. If you are unsure of the best answer, eliminate the choices that you know are incorrect, then select an answer from the choices that remain. Indicate your selection by blackening the corresponding circle on your answer sheet. A periodic table is provided below for your use with the questions. PERIODIC TABLE OF THE ELEMENTS 1 H 1.0 2 He 4.0 3 Li 6.9 4 Be 9.0 5 B 10.8 6 C 12.0 7 N 14.0 8 O 16.0 9 F 19.0 10 Ne 20.2 11 Na 23.0 12 Mg 24.3 13 Al 27.0 14 Si 28.1 15 P 31.0 16 S 32.1 17 Cl 35.5 18 Ar 39.9 19 K 39.1 20 Ca 40.1 21 Sc 45.0 22 Ti 47.9 23 V 50.9 24 Cr 52.0 25 Mn 54.9 26 Fe 55.8 27 Co 58.9 28 Ni 58.7 29 Cu 63.5 30 Zn 65.4 31 Ga 69.7 32 Ge 72.6 33 As 74.9 34 Se 79.0 35 Br 79.9 36 Kr 83.8 37 Rb 85.5 38 Sr 87.6 39 Y 88.9 40 Zr 91.2 41 Nb 92.9 42 Mo 95.9 43 Tc (98) 44 Ru 101.1 45 Rh 102.9 46 Pd 106.4 47 Ag 107.9 48 Cd 112.4 49 In 114.8 50 Sn 118.7 51 Sb 121.8 52 Te 127.6 53 I 126.9 54 Xe 131.3 55 Cs 132.9 56 Ba 137.3 57 La * 138.9 72 Hf 178.5 73 Ta 180.9 74 W 183.9 75 Re 186.2 76 Os 190.2 77 Ir 192.2 78 Pt 195.1 79 Au 197.0 80 Hg 200.6 81 Tl 204.4 82 Pb 207.2 83 Bi 209.0 84 Po (209) 85 At (210) 86 Rn (222) 87 Fr (223) 88 Ra 226.0 89 Ac † 227.0 104 Unq (261) 105 Unp (262) 106 Unh (263) 107 Uns (262) 108 Uno (265) 109 Une (267) * 58 Ce 140.1 59 Pr 140.9 60 Nd 144.2 61 Pm (145) 62 Sm 150.4 63 Eu 152.0 64 Gd 157.3 65 Tb 158.9 66 Dy 162.5 67 Ho 164.9 68 Er 167.3 69 Tm 168.9 70 Yb 173.0 71 Lu 175.0 90 Th 232.0 91 Pa (231) 92 U 238.0 93 Np (237) 94 Pu (244) 95 Am (243) 96 Cm (247) 97 Bk (247) 98 Cf (251) 99 Es (252) 100 Fm (257) 101 Md (258) 102 No (259) 103 Lr (260) GO ON TO THE NEXT PAGE.
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Digestive and Excretory Systems Test 1 KAPLAN 3 Passage I (Questions 1–5) The kidneys regulate hydrogen ion (H + ) concentration in extracellular fluid primarily by controlling the concentration of bicarbonate ion (HCO 3 ). The process begins inside the epithelial cells of the proximal tubule, where the enzyme carbonic anhydrase catalyzes the formation of carbonic acid (H 2 CO 3 ) from 2 and H 2 O. The H 2 3 then dissociates into HCO 3 and H + . The HCO 3 enters the extracellular fluid, while the H + is secreted into the tubule lumen via a Na + –H + countertransport mechanism, which takes advantage of the Na + gradient established by the Na + –K + pump. Since the renal tubule is not very permeable to the HCO 3 filtered into the glomerular filtrate, the reabsorption of HCO 3 from the lumen into the tubular cells occurs in a roundabout way. Carbonic anhydrase causes this HCO 3 to combine with the secreted H + , forming H 2 3 . The H 2 3 then dissociates into CO 2 and H 2 O. The H 2 O remains in the lumen, while the CO 2 enters the tubular cells Looking at Figure 1, it can be seen that inside the cells, every H + secreted into the lumen is countered by an 3 entering the extracellular fluid. Thus, the basic
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This note was uploaded on 01/22/2012 for the course PHYSICS 121 taught by Professor Fayngold during the Spring '10 term at NJIT.

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Digestive and Excretory Systems Test w. solutions - BIOLOGY...

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