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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?

Methylene blue
Phenolpthalene
Bromocresol green
Safranin

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

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

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

Pink
Green
Purple
Colourless

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

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

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Identification of Bacteria
The deinococci are gram-positive cocci and rods that are distinctive in their unusually great resistance to

extreme temperatures
desiccation
radiation
both (a) and (b)

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Identification of Bacteria
Catalase production is negative in which of the following?

Salmonella
Proteus
Streptococcus
Staphylococcus

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