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Identification of Bacteria

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

Bromocresol green
Safranin
Phenolpthalene
Methylene blue

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

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

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Identification of Bacteria
Which of the following organisms can be demonstrated with silver impregnation method?

Salmonella
Spirochaetes
Vibrios
Shigella

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

Colourless
Pink
Purple
Green

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

Colourless
Green
Purple
Pink

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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?

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

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