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Identification of Bacteria

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

Streptococcus
Salmonella
Staphylococcus
Proteus

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

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

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

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

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

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

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

Spirochaetes
Vibrios
Shigella
Salmonella

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

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

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