Discussion
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- Question
Which of the following factors will affect the sensitivity of animal cells to shear conditions?
Options- A. Cell size
- B. Availability of nutrients in the medium
- C. The presence of shear protectorants in the medium
- D. All of the above
- Correct Answer
- All of the above
- 1. A thixotropic fluid is one in which the viscosity
Options- A. is constant regardless of the stirrer speed or mixing time
- B. changes during mixing but returns to its original state after mixing
- C. increases with mixing time
- D. decreases with mixing time Discuss
- 2. The viscosity of water at STP is approximately
Options- A. 0.005 kg.m-1.s-1
- B. 0.001 kg.m-1.s-1
- C. 0.003 kg.m-2.s-1
- D. 0.1 g.cm-1.s-1 Discuss
- 3. Filamentous fungal cells are more shear sensitive than bacterial cells because of
Options- A. the presence of citin in cell walls of filamentous fungi
- B. larger in size than bacterial cells and therefore are more susceptible to shear forces
- C. fungal cells are much larger than bacterial cells
- D. all of the above Discuss
- 4. The viscosity of a fluid increases with increasing stirrer speed. This fluid would be best described as being
Options- A. newtonian
- B. pseudoplastic
- C. dilatant
- D. thixotropic Discuss
- 5. The viscosity of the culture fluid is classified as both pseudoplastic and thixotropic which indicates that the viscosity
Options- A. increases with stirring speed but decreases with mixing time
- B. increases with stirring speed and increases with mixing time
- C. decreases with stirring speed but increases with mixing time
- D. decreases with stirring speed and decreases with mixing time Discuss
- 6. The viscosity of a fluid increases with the length of time that it is being mixed. This fluid would be best described as being
Options- A. newtonian
- B. rheopectic
- C. viscoelastic
- D. thixotropic Discuss
- 7. The approach which is commonly used to determine the level of damage to animal cells in a culture medium is to monitor
Options- A. the concentration of lactate in the medium
- B. the level of lactate oxidase activity in the medium
- C. the level of lactate dehydrogenase activity
- D. the level of lactase activity in the medium Discuss
- 8. Which of the following describes the importance of the Kolmogorov eddy size in the biotechnology?
Options- A. The Kolmogorov eddy size is a measure of the smallest eddy size in a liquid
- B. When the Kolmogorov eddy size become equivalent or smaller than the cell or particle diameter, then the cell or particle will become susceptible to shear damage
- C. At the Kolmogorov eddy size, much of the energy of the originating eddy will be released
- D. All of the above Discuss
- 9. A stirred tank reactor containing a fluid with a density of 2.5 g.ml-1 and viscosity of 0.002 kg m-1s-1 is mixed at 120 rpm. If the fluid is mixed with an impeller having diameter 50 cm, then the Reynolds number of the liquid in the reactor is
Options- A. 2500
- B. 100
- C. 12,50,000
- D. 1,000,000 Discuss
- 10. Which of the following can act as a shear protectorant?
Options- A. Serum
- B. Silicone oil
- C. Glucose
- D. Glutamic acid Discuss
Fluid Flow problems
Search Results
Correct Answer: decreases with mixing time
Correct Answer: 0.001 kg.m-1.s-1
Correct Answer: all of the above
Correct Answer: dilatant
Correct Answer: decreases with stirring speed and decreases with mixing time
Correct Answer: rheopectic
Correct Answer: the level of lactate dehydrogenase activity
Correct Answer: All of the above
Correct Answer: 12,50,000
Correct Answer: Serum
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