Identification of Bacteria problems
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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 Discuss
Correct Answer: Methyl red test
- 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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