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Identification of Bacteria

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

Indole test
Methyl red test
Voges-Proskauer test
Citrate test

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

Green
Purple
Pink
Colourless

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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
Acetone
Ethyl alcohol

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

Salmonella
Streptococcus
Proteus
Staphylococcus

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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 the crystal violet dye during solvent treatment.
to retain part of both dyes

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Identification of Bacteria
Gram staining was developed accidentally in 1884 by

Alexander Fleming
Robert Gram
Hans Christian Gram
Joseph Christian Gram

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