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Identification of Bacteria

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

Purple
Colourless
Pink
Green

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

Green
Pink
Purple
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
Ethyl alcohol
Acetone

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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
The gram-negative organisms is

None of these
Clostridium
Bacillus
Actinomyces

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

Voges-Proskauer test
Indole test
Citrate test
Methyl red test

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