Exercise: Identification Of Bacteria

Questions for: Identification Of Bacteria

The process of Gram staining is based on the ability of bacterial cell wall
A:
to retain the safranin dye
B:
to retain the crystal violet dye during solvent treatment.
C:
to retain part of both dyes
D:
none of above
Answer: B
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Which of the following(s) show(s) positive results for phenylalanine deaminase test?
A:
Providencia
B:
Proteus
C:
Morganella
D:
All of these
Answer: D
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Which of the following organisms can be demonstrated with silver impregnation method?
A:
Vibrios
B:
Salmonella
C:
Spirochaetes
D:
Shigella
Answer: C
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Gram staining was developed accidentally in 1884 by
A:
Alexander Fleming
B:
Hans Christian Gram
C:
Joseph Christian Gram
D:
Robert Gram
Answer: B
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What is the order of reagents used in the Gram stain?
A:
Crystal violet, iodine, safranin, decolorizer
B:
Crystal violet, iodine, decolorizer, safranin
C:
Safranin, crystal violet, decolorizer, iodine
D:
Crystal violet, safranin, iodine, decolorizer
Answer: B
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