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Identification of Bacteria

Identification of Bacteria
Which of the following(s) is/ are oxidase-positive bacteria?

Neisseria
All of these
Vibrio
Pseudomonas

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

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

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

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

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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?

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

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Identification of Bacteria
Which of the following is a primary stain for acid fast staining of mycobacteria?

Carbol fuchsin
Crystal violet
Geimsa
Methylene blue

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Identification of Bacteria
The production of sufficient acid by fermentation of glucose leads to decrease in pH such that pH of the medium falls below 4.5. Which of the following test can detect it?

Methyl red test
Citrate utilization test
Voges-Proskauer test
Indole test

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