The production of sufficient acid by fermentation of glucose leads to decrease i

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Question
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?
Options
A. Indole test
B. Methyl red test
C. Citrate utilization test
D. Voges-Proskauer test

Correct Answer

Methyl red test

Identification of Bacteria problems

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1. What is the colour of gram -postive bacteria on a gram staining?
Options
A. Purple
B. Pink
C. Colourless
D. Green

Discuss

Correct Answer: Purple

2. Gram staining was developed accidentally in 1884 by
Options
A. Alexander Fleming
B. Hans Christian Gram
C. Joseph Christian Gram
D. Robert Gram

Discuss

Correct Answer: Hans Christian Gram

3. Production of acetoin can be detected by which of the following tests?
Options
A. Citrate test
B. Voges-Proskauer test
C. Methyl red test
D. Indole test

Discuss

Correct Answer: Voges-Proskauer test

4. Which of the following is a substitute for crystal violet used in gram-staining procedure?
Options
A. Methylene blue
B. Bromocresol green
C. Safranin
D. Phenolpthalene

Discuss

Correct Answer: Methylene blue

5. What is the order of reagents used in the Gram stain?
Options
A. Crystal violet, iodine, safranin, decolorizer
B. Crystal violet, iodine, decolorizer, safranin
C. Safranin, crystal violet, decolorizer, iodine
D. Crystal violet, safranin, iodine, decolorizer

Discuss

Correct Answer: Crystal violet, iodine, decolorizer, safranin

6. At what concentration of sulphuric acid, Nocardia resists decolourization?
Options
A. 0.5% sulphuric acid
B. 5% sulphuric acid
C. 10% sulphuric acid
D. 8% sulphuric acid

Discuss

Correct Answer: 0.5% sulphuric acid

7. Which of the following organisms can be demonstrated with silver impregnation method?
Options
A. Vibrios
B. Salmonella
C. Spirochaetes
D. Shigella

Discuss

Correct Answer: Spirochaetes

8. The organisms that can be acid-fast stained is
Options
A. Nocardia
B. Tubercle bacilli
C. Lepra bacilli
D. all of these

Discuss

Correct Answer: all of these

9. Which of the following is commonly used as Gram's decolouriser?
Options
A. Ethyl alcohol
B. Methyl alcohol
C. Acetone
D. A mixture of ethyl alcohol and acetone

Discuss

Correct Answer: A mixture of ethyl alcohol and acetone

10. What is the colour of gram-negative bacteria on a gram staining?
Options
A. Purple
B. Pink
C. Green
D. Colourless

Discuss

Correct Answer: Pink

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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?

Identification of Bacteria problems

Search Results

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