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Microbiology
‣
Identification of Bacteria
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Question
Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon's citrate medium?
Options
A. Blue colour
B. Appearance of growth
C. Both (a) and (b)
D. None of these
Correct Answer
Both (a) and (b)
Identification of Bacteria problems
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1. The deinococci are gram-positive cocci and rods that are distinctive in their unusually great resistance to
Options
A. radiation
B. desiccation
C. both (a) and (b)
D. extreme temperatures
Show Answer
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Discuss
Correct Answer: both (a) and (b)
2. Which of the following is a primary stain for acid fast staining of mycobacteria?
Options
A. Crystal violet
B. Carbol fuchsin
C. Geimsa
D. Methylene blue
Show Answer
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Correct Answer: Carbol fuchsin
3. Which of the following shows a positive urease test?
Options
A.
Proteus
B.
Klebsiella
C. Both (a) and (b)
D. None of these
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Correct Answer: Both (a) and (b)
4. Which of the following(s) is/ are oxidase-positive bacteria?
Options
A.
Vibrio
B.
Neisseria
C.
Pseudomonas
D. All of these
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Correct Answer: All of these
5. The primary stain of Gram's method is
Options
A. safranin
B. phenolpthalene
C. crystal violet
D. methyl red
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Discuss
Correct Answer: crystal violet
6. What is the order of reagents used in the Gram stain?
Options
A. Crystal violet, iodine, safranin, decolorizer
B. Crystal violet, iodine, decolorizer, safranin
C. Safranin, crystal violet, decolorizer, iodine
D. Crystal violet, safranin, iodine, decolorizer
Show Answer
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Correct Answer: Crystal violet, iodine, decolorizer, safranin
7. Which of the following is a substitute for crystal violet used in gram-staining procedure?
Options
A. Methylene blue
B. Bromocresol green
C. Safranin
D. Phenolpthalene
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Correct Answer: Methylene blue
8. Production of acetoin can be detected by which of the following tests?
Options
A. Citrate test
B. Voges-Proskauer test
C. Methyl red test
D. Indole test
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Correct Answer: Voges-Proskauer test
9. Gram staining was developed accidentally in 1884 by
Options
A. Alexander Fleming
B. Hans Christian Gram
C. Joseph Christian Gram
D. Robert Gram
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Correct Answer: Hans Christian Gram
10. What is the colour of gram -postive bacteria on a gram staining?
Options
A. Purple
B. Pink
C. Colourless
D. Green
Show Answer
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Discuss
Correct Answer: Purple
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