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- Question
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
- Correct Answer
- 600-700nm
- 1. 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
- 2. Catalase production is negative in which of the following?
Options- A. Streptococcus
- B. Salmonella
- C. Proteus
- D. Staphylococcus Discuss
- 3. What is the colour of gram-negative bacteria on a gram staining?
Options- A. Purple
- B. Pink
- C. Green
- D. Colourless Discuss
- 4. 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
- 5. The organisms that can be acid-fast stained is
Options- A. Nocardia
- B. Tubercle bacilli
- C. Lepra bacilli
- D. all of these Discuss
- 6. 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
- 7. 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
- 8. Which of the following is incorrect?
Options- A. Mammalian cells are larger and more complex than microorganisms
- B. Their growth rate is very fast compared to microorganisms
- C. Mammalian cells are fragile
- D. Most animal cells only grow when attached to surface Discuss
- 9. Which of the following is incorrect?
Options- A. Plant cells are larger than the bacterial or fungus cells
- B. Plant cells tend to grow in clumps
- C. Plant cells are less sensitive to shear than microbial cells
- D. Plant cells are more genetically unstable than microbial cells Discuss
- 10. Thiobacillus thiooxidans has an optimum pH of
Options- A. 2.0-3.5
- B. 0.5-6.0
- C. 6.5-7.5
- D. 9.0-9.5 Discuss
Cell Cultivations problems
Search Results
Correct Answer: 20-40?m in diameter and 100-200?m long
Correct Answer: Streptococcus
Correct Answer: Pink
Correct Answer: A mixture of ethyl alcohol and acetone
Correct Answer: all of these
Correct Answer: aseptic solid nutrient medium
Correct Answer: they lack murein in their cell wall
Correct Answer: Their growth rate is very fast compared to microorganisms
Correct Answer: Plant cells are less sensitive to shear than microbial cells
Correct Answer: 2.0-3.5
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