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Identification of Bacteria

Identification of Bacteria
Which of the following is commonly used as Gram's decolouriser?

Ethyl alcohol
Acetone
Methyl alcohol
A mixture of ethyl alcohol and acetone

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Identification of Bacteria
The process of Gram staining is based on the ability of bacterial cell wall

to retain the safranin dye
to retain the crystal violet dye during solvent treatment.
to retain part of both dyes
none of above

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Identification of Bacteria
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?

Appearance of growth
Blue colour
None of these
Both (a) and (b)

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Identification of Bacteria
Gram staining was developed accidentally in 1884 by

Alexander Fleming
Robert Gram
Hans Christian Gram
Joseph Christian Gram

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Identification of Bacteria
The primary stain of Gram's method is

safranin
crystal violet
phenolpthalene
methyl red

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Identification of Bacteria
What is the order of reagents used in the Gram stain?

Safranin, crystal violet, decolorizer, iodine
Crystal violet, iodine, decolorizer, safranin
Crystal violet, safranin, iodine, decolorizer
Crystal violet, iodine, safranin, decolorizer

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