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- Question
The heated medium passes through a holding section, which is usually maintained in
Options- A. adiabatic conditions
- B. isothermal conditions
- C. isotropic conditions
- D. isobaric conditions
- Correct Answer
- adiabatic conditions
- 1. The main function(s) of a draft tube in an air lift fermenter is/are to
Options- A. increase the solubility of oxygen
- B. distribute shear forces throughout the reactor and minimise bubble coalescence
- C. concentrate shear forces around the sparger
- D. concentrate shear forces near the disengagement zone Discuss
- 2. The bubble column fermenter is usually limited to
Options- A. aerobic fermentations
- B. anaerobic fermentations
- C. Both (a) and (b)
- D. facultative fermentation Discuss
- 3. The specific growth rate is affected by
Options- A. sabstrate concentration
- B. product concentration
- C. oxygen supply
- D. all of these Discuss
- 4. Saccharomyces cerevisiae when grown in high glucose concentration medium, the cells activity depends on which of the following?
Options- A. High concentration of dissolved oxygen
- B. Low concentration of dissolved oxygen
- C. No effect of dissolved oxygen
- D. High concentration of dissolved oxygen and sodium salts Discuss
- 5. The application of just in time (JIT) manufacturing techniques in biotechnology is important because
Options- A. raw materials used in biotechnology are biodegradable
- B. the products of biotechnology are biodegradable
- C. it is a very competitive business (d) all of the above
- D. all of the above Discuss
- 6. 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
- 7. Animal cell cultures do not have much effect on shear forces because
Options- A. the cell size is generally smaller than the critical eddy size at which shear will have an effect
- B. cells are larger than the critical eddy size at which shear will have an effect
- C. animal cells have cell walls
- D. animal cells have cell membranes Discuss
- 8. 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
- 9. The efficiency of cell disruption in a bead mill depends on the
Options- A. concentration of the cells
- B. amount and size of beads
- C. type and rotational speed of agitation
- D. all of these Discuss
- 10. In fed batch bioreactor modelling, the rate of change in the bioreactor volume is assumed to be equal to
Options- A. flow rate
- B. initial volume
- C. volume of solids in the reactor
- D. none of these Discuss
More questions
Correct Answer: distribute shear forces throughout the reactor and minimise bubble coalescence
Correct Answer: aerobic fermentations
Correct Answer: all of these
Correct Answer: No effect of dissolved oxygen
Correct Answer: all of the above
Correct Answer: decreases with stirring speed and decreases with mixing time
Correct Answer: the cell size is generally smaller than the critical eddy size at which shear will have an effect
Correct Answer: dilatant
Correct Answer: all of these
Correct Answer: flow rate
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