Exercise: Identification Of Bacteria

Questions for: Identification Of Bacteria

What is the colour of gram -postive bacteria on a gram staining?
A:
Purple
B:
Pink
C:
Colourless
D:
Green
Answer: A
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The production of sufficient acid by fermentation of glucose leads to decrease in pH such that pH of the medium falls below 4.5. Which of the following test can detect it?
A:
Indole test
B:
Methyl red test
C:
Citrate utilization test
D:
Voges-Proskauer test
Answer: B
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Production of acetoin can be detected by which of the following tests?
A:
Citrate test
B:
Voges-Proskauer test
C:
Methyl red test
D:
Indole test
Answer: B
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Which of the following is commonly used as Gram's decolouriser?
A:
Ethyl alcohol
B:
Methyl alcohol
C:
Acetone
D:
A mixture of ethyl alcohol and acetone
Answer: D
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At what concentration of sulphuric acid, Nocardia resists decolourization?
A:
0.5% sulphuric acid
B:
5% sulphuric acid
C:
10% sulphuric acid
D:
8% sulphuric acid
Answer: A
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