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- Question
What is the colour of gram-negative bacteria on a gram staining?
Options- A. Purple
- B. Pink
- C. Green
- D. Colourless
- Correct Answer
- Pink
- 1. 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
- 2. The organisms that can be acid-fast stained is
Options- A. Nocardia
- B. Tubercle bacilli
- C. Lepra bacilli
- D. all of these Discuss
- 3. Which of the following organisms can be demonstrated with silver impregnation method?
Options- A. Vibrios
- B. Salmonella
- C. Spirochaetes
- D. Shigella Discuss
- 4. 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
- 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
- 6. Catalase production is negative in which of the following?
Options- A. Streptococcus
- B. Salmonella
- C. Proteus
- D. Staphylococcus Discuss
- 7. The size of a single plant cell is usually within the range of
Options- A. 10-20?m in diameter and 25-100?m long
- B. 20-40?m in diameter and 100-200?m long
- C. 40-60?m in diameter and 200-300?m long
- D. 60-80?m in diameter and 300-400?m long Discuss
- 8. The cell mass can be measured optically by determining the amount of light scattered by a suspension of cells. The measurements are usually at a wavelength of
Options- A. 300-400nm
- B. 400-500nm
- C. 500-600nm
- D. 600-700nm Discuss
- 9. Callus cultures are amorphous cell aggregates arising from the unorganized growth of explants on an
Options- A. liquid medium
- B. solid nutrient medium
- C. aseptic solid nutrient medium
- D. solid or liquid medium Discuss
- 10. The archaebacterium Halobacterium, an extreme halophile, and Sulfolobus, a thermoacidophile, can be cultured in the presence of antibiotics such as streptomycin and chloramphenicol because
Options- A. they contain ether-linked isoprenoids in their plasma membrane
- B. they lack murein in their cell wall
- C. they contain 80S, as opposed to 70S, ribosomes
- D. all of the above Discuss
Identification of Bacteria problems
Search Results
Correct Answer: A mixture of ethyl alcohol and acetone
Correct Answer: all of these
Correct Answer: Spirochaetes
Correct Answer: 0.5% sulphuric acid
Correct Answer: Methyl red test
Correct Answer: Streptococcus
Correct Answer: 20-40?m in diameter and 100-200?m long
Correct Answer: 600-700nm
Correct Answer: aseptic solid nutrient medium
Correct Answer: they lack murein in their cell wall
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