Microbiology Test w. solutions

Microbiology Test w. solutions - BIOLOGY TOPICAL...

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BIOLOGY TOPICAL: Microbiology Test 1 Time: 20 Minutes* Number of Questions: 15 * 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)
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Microbiology Test 1 KAPLAN 3 Passage I (Questions 1–5) Conjugation occurs between bacterial cells of different mating types. “Maleness” in bacteria is determined by the presence of a small extra piece of DNA that can replicate independently of the larger chromosome. Male bacteria having this sex factor, known as the F factor, are termed F + if the sex factor exists extrachromosomally. F + bacteria can conjugate only with F bacteria, the “female” counter-parts, which do not possess the F factor. Genes on the F factor determine the formation of hair-like projections on the surface of the F + bacterium, called sex pili . The pili form cytoplasmic bridges through which genetic material may be transferred. The pili also aid the F + cell in adhering to the F cell during conjugation. During conjugation of an F+ cell with an F cell, the DNA that is most likely to be transferred to the female is the F factor itself. Prior to transfer, the F factor replicates. The F thus becomes an F + by receiving one copy of the F factor, while the original F + holds on to the other copy.
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Microbiology Test w. solutions - BIOLOGY TOPICAL...

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