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Identification of Bacteria

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

Indole test
Voges-Proskauer test
Methyl red test
Citrate test

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

Colourless
Green
Pink
Purple

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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?

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

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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
Catalase production is negative in which of the following?

Salmonella
Proteus
Streptococcus
Staphylococcus

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

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