Quiznetik

Microbiology | Set 5

1. Temperature used for hot air oven is

Correct : C. 160oC for 1 hour

2. Phenol co-efficient indicates

Correct : A. Efficiency of a disinfectant

3. This is an agar plate method and is commonly used for estimation of the number of bacteria in milk.

Correct : A. Standard Plate Count (SPC)

4. Agar is obtained form

Correct : B. Red algae

5. A gram positive organism which produces swarming on culture medium is

Correct : D. Proteus

6. Enhancement of virulence in bacteria is known as

Correct : C. Exaltation

7. For effective sterilization in an autoclave the temperature obtained is

Correct : C. 120oC

8. Spores are killed by

Correct : D. Both b and c

9. Glassware are sterilized by

Correct : B. Hot air over

10. Tyndallisation was proposed by

Correct : A. Tyndall

11. Viruses can be cultivated in

Correct : C. Living cells

12. By pasteurization

Correct : B. Only pathogenic forms can be removed

13. The temperature required for pasteurization is

Correct : B. Below 100oC

14. In the medium other than nutrients, if any substance is used in excess, that medium is

Correct : A. Enriched medium

15. Example for indicator medium is

Correct : C. Wilson and Blair

16. Example of Anaerobic medium is

Correct : A. Robertson cooked-meat medium

17. The differentiate lactose and non-lactose fermentors, the medium used is

Correct : D. Mac-Conkey’s Agar

18. Best method for getting pure culture is

Correct : C. Both a & b

19. To transfer cultures from one place to another, the device used is

Correct : B. Needle

20. The bacterial culture prepared by pure culture is

Correct : A. Inoculum

21. Separation of a single colony is

Correct : B. Isolation

22. Growth period of the culture is

Correct : B. Incubation

23. At the temperature 160oC for one hour, complete sterilization occurs in

Correct : B. Hot air oven

24. In autoclave, the principle involved is

Correct : D. Both b and c

25. The spores of th bacteria which can withstand the moist heat effect also

Correct : C. Bacillus stearothermophilus

26. Factors on which disinfectivity of a disinfectant depends

Correct : D. All of the above

27. Aldehydes, which are most powerful disinfectants

Correct : D. Both a and c

28. Accridine dyes are more effective against

Correct : A. Gram positive

29. The sterilizing agent is

Correct : A. Ethelene oxide

30. Salts of heavy metals used as disinfectants are

Correct : D. All of these

31. Cultures are prepared by penetrating the inoculation loop with suspension into the medium, they are

Correct : B. Stabcultures

32. The principle involved in the streak plate method is

Correct : D. Dilution

33. Culture media for fungi are

Correct : D. All of the above

34. Spores of actinomycetes are very sensitive, killed at room temperature of

Correct : B. 65oC for 30 min.

35. The term that is used for the bacteria which can withstand pasteurization but does not grow at higher temperatures

Correct : C. Thermoduric

36. A common laboratory method of cultivating anaerobic micro-organisms is

Correct : C. Pyrogallic acid over the cotton

37. Alkaliphiles grow at pH value between

Correct : D. 7 to 12

38. The micro-organisms grow at high salinity are

Correct : C. Both a and b

39. Non-lactose fermenting colonies seen on Mac Conkey’s medium are

Correct : A. Salmonella typhi

40. Wilson and Blair medium is used for isolation of

Correct : B. Salmonella typhosa

41. Laboratory diagnosis of enteric fever is based on

Correct : D. All of the above

42. Shigella was first isolated by

Correct : C. Sonnei

43. Which of the following are gas producing Salmonella?

Correct : B. S.enteritidis

44. Kauffmann white scheme is used to detect

Correct : A. Salmonella spp.

45. On Mac Conkey’s medium Esch. Coli forms

Correct : C. Pink coloured colonies

46. C.diphtheriae requires

Correct : C. Potassium tellurite medium

47. Culture medium for Mycobacterium tuberculosis

Correct : A. LJ medium

48. Lepra bacillus is best cultured on

Correct : B. Foot pad of mice

49. Culture medium for clostridia spp.

Correct : C. Robertson’s cooked meat medium

50. Clsotridium welchii is positive for

Correct : B. Nagler’s test

51. Nagler’s reaction detects

Correct : C. Lecithinase

52. Incubation period of Cl. welchii is

Correct : A. 8-12 hour

53. The average incubation period of tetanus is

Correct : B. 7-10 days

54. Salt agar is used for

Correct : B. Staphylococcus

55. Culture medium of Leishmania is

Correct : B. NNN medium

56. A simple asexual spore which develops by budding is known as

Correct : B. Blastospore

57. Culture medium used for fungus is

Correct : A. Sabouraud’s medium

58. For ster i l izat ion of fermentat ion equipment the method followed is

Correct : D. All of these

59. The size of the virus can be determined by

Correct : D. All of these

60. Differential staining of bacteria spore is related to

Correct : C. Moller’s staining

61. Wilson and Blair bismuth sulphite medium is used for the growth

Correct : A. Salmonella typhi

62. Which Rickettsia can be grown on blood agar media?

Correct : A. Lactobacilli

63. Which virus was first observed?

Correct : B. TMV

64. The most important energy-yielding reaction for an aerobic organism is

Correct : D. Both b and c

65. A disease that can be transmitted by an infectious agent from one individual to another was called

Correct : C. Communicable

66. Cell cycle regulated by

Correct : C. Cyclins and Cd ks

67. The prote inaceous compound are converted to ammonia by

Correct : B. Ammonifiaction bacteria

68. A cell becomes flaccid when placed in a

Correct : B. Hypertonic solution

69. A mutation causing a substitution of one amino acid is called

Correct : C. Missence mutation

70. The formation spindle fibres in the process of cell division is prevented by

Correct : C. Hydrazine

71. Important class of respiratory enzymes:

Correct : B. Cytochromes

72. The primary mode of transmission of poliomyelitis virus:

Correct : D. Food and water

73. Genetic constitution of the cell is

Correct : B. Genotype

74. The primary mode of transmission of poliomyelitis is

Correct : C. Milk

75. Cerebral malaria is caused by

Correct : C. P.falsiparum

76. Ergot disease is caused by

Correct : C. Claveceps

77. Most bacteria require vitamins as

Correct : A. Growth Factors

78. Which of these is a trace element for bacteria?

Correct : B. Na+

79. Virulent factor in pneumococcus is

Correct : D. Emdotoxins

80. The Bacter ia move in response to magnetic field is

Correct : C. Aquaspirillum Magnetotacticum

81. Nagler reaction detects

Correct : C. Clostridium perfringens

82. The following organisms lack definite cell wall

Correct : C. Both a and b

83. The following disease are caused by Mycoplasma except

Correct : D. Citrus canker

84. Mycotoxins are produced by

Correct : B. Fungi

85. The main product of glycolysis under aerobic conditions is

Correct : A. Pyruvate

86. The protein moiety of an enzyme is known as

Correct : B. Apo enzyme

87. Yeast extract is an excellent source of

Correct : C. B Vitamin

88. Example of anaerobic medium

Correct : C. Robertson’s cooked meat medium

89. Biological Oxygen Demand (BOD) is a measure of:

Correct : A. Industrial wastes poured into water bodies

90. An example of competitive inhibition of an enzyme is the inhibition of

Correct : A. Succinic dehydrogenase by malonic acid

91. The following organisms have been proposed as sources of single cell protein

Correct : D. All the three

92. Nitrites are oxidized to nitrates by a microorganism

Correct : C. Nitrobacter

93. The major constituents in agar are

Correct : C. Polysaccharides

94. Multiple antibiotic resistance is mediated by

Correct : B. Plasmid

95. “Antagonism “ is seen in

Correct : D. None of these

96. the first phase of a growth curve is

Correct : B. Lag phase

97. In gram positive and gram negative bacteria the electron transport contains

Correct : A. Naphthquinone

98. Growth in a closed system, affected by nutrient limitation and waste product accumulation is called

Correct : A. Batch culturing

99. Cells are active and synthesizing new protoplasm. This stage of growth is called

Correct : A. Lag phase

100. Which one of the following tissues can metabolize glucose, fatty acids and ketone bodies for ATP production?

Correct : B. Muscle