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- Question
What is the colour of gram -postive bacteria on a gram staining?
Options- A. Purple
- B. Pink
- C. Colourless
- D. Green
- Correct Answer
- Purple
- 1. Gram staining was developed accidentally in 1884 by
Options- A. Alexander Fleming
- B. Hans Christian Gram
- C. Joseph Christian Gram
- D. Robert Gram Discuss
- 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
- 3. 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
- 4. 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
- 5. 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?
Options- A. Blue colour
- B. Appearance of growth
- C. Both (a) and (b)
- D. None of these Discuss
- 6. 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
- 7. 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
- 8. Which of the following organisms can be demonstrated with silver impregnation method?
Options- A. Vibrios
- B. Salmonella
- C. Spirochaetes
- D. Shigella Discuss
- 9. The organisms that can be acid-fast stained is
Options- A. Nocardia
- B. Tubercle bacilli
- C. Lepra bacilli
- D. all of these Discuss
- 10. 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
Identification of Bacteria problems
Search Results
Correct Answer: Hans Christian Gram
Correct Answer: Voges-Proskauer test
Correct Answer: Methylene blue
Correct Answer: Crystal violet, iodine, decolorizer, safranin
Correct Answer: Both (a) and (b)
Correct Answer: Methyl red test
Correct Answer: 0.5% sulphuric acid
Correct Answer: Spirochaetes
Correct Answer: all of these
Correct Answer: A mixture of ethyl alcohol and acetone
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