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Identification of Bacteria

Identification of Bacteria
At what concentration of sulphuric acid, Nocardia resists decolourization?

0.5% sulphuric acid
5% sulphuric acid
8% sulphuric acid
10% sulphuric acid

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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?

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

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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, iodine, safranin, decolorizer
Crystal violet, safranin, iodine, decolorizer

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

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Identification of Bacteria
Which of the following is a substitute for crystal violet used in gram-staining procedure?

Phenolpthalene
Bromocresol green
Methylene blue
Safranin

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Identification of Bacteria
The organisms that can be acid-fast stained is

all of these
Lepra bacilli
Tubercle bacilli
Nocardia

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