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Identification of Bacteria

Identification of Bacteria
Which of the following shows a positive urease test?

Both (a) and (b)
Proteus
Klebsiella
None of these

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

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

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Identification of Bacteria
Production of acetoin can be detected by which of the following tests?

Voges-Proskauer test
Citrate test
Indole test
Methyl red test

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

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

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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
Both (a) and (b)
None of these

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Identification of Bacteria
What is the colour of gram-negative bacteria on a gram staining?

Colourless
Pink
Purple
Green

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