IDENTIFICATION OF BACTERIA QUIZ

At what concentration of sulphuric acid, Nocardia resists decolourization?

10% sulphuric acid

8% sulphuric acid

5% sulphuric acid

0.5% sulphuric acid

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YOUR ANSWER : ?

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?

None of these

Both (a) and (b)

Blue colour

Appearance of growth

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Gram staining was developed accidentally in 1884 by

Robert Gram

Joseph Christian Gram

Alexander Fleming

Hans Christian Gram

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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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Which of the following is a substitute for crystal violet used in gram-staining procedure?

Safranin

Phenolpthalene

Bromocresol green

Methylene blue

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Which of the following shows a positive urease test?

Both (a) and (b)

Proteus

Klebsiella

None of these

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

Purple

Pink

Green

Colourless

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Catalase production is negative in which of the following?

Proteus

Staphylococcus

Streptococcus

Salmonella

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

Safranin, crystal violet, decolorizer, iodine

Crystal violet, iodine, decolorizer, safranin

Crystal violet, iodine, safranin, decolorizer

Crystal violet, safranin, iodine, decolorizer

TRUE ANSWER : ?
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The gram-negative organisms is

Actinomyces

Bacillus

None of these

Clostridium

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