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- Question
The solvent flux across the membrane can be expressed as (where A is the area, Lp is the membrane permeability, ? is the reflection point, ?p is applied pressure and ?? is the osmotic pressure)
Options- A. J = Lp(?p - ???)
- B. J/A = Lp(?p - ???)
- C. J = Lp/???
- D. J/A = Lp/?p
- Correct Answer
- J = Lp(?p - ???)
- 1. Low dissolved oxygen concentrations leads to
Options- A. low biomass yields
- B. high biomass yields
- C. no effect on biomass yields
- D. none of the above Discuss
- 2. When Escherichia coli grow in a well aerated medium, which of the following will occur?
Options- A. Fructose di-phosphate accumulation inside the cells leading to cell respiration
- B. Fructose di-phosphate accumulation inside the cells leading to fermentation
- C. Fructose di-phosphate will accumulate regardless of the medium composition
- D. Fructose di-phosphate will accumulate inside the cells leading to anaerobic respiration Discuss
- 3. The chemical oxygen demand (COD)measures the
Options- A. amount of oxygen required for growth of microorganisms in water
- B. amount of oxygen that would be removed from the water in order to oxidize pollution
- C. amount of oxygen required to oxidize the calcium present in waste water
- D. none of the above Discuss
- 4. Which of the following type(s) of stirrer can be used for microbiological processes?
Options- A. Mig
- B. Intermig
- C. Turbine
- D. All of these Discuss
- 5. Water insoluble enzymes can be prepared by using multifunctional agents that are bifunctional in nature and have
Options- A. low molecular weight
- B. high molecular weight
- C. high equivalent weight
- D. low reactivity Discuss
- 6. Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?
Options- A. Batch fermenter with a high initial glucose concentration
- B. Continuous fermenter with a low initial glucose concentration
- C. Fed batch fermenter
- D. All of the above Discuss
- 7. The stage wise operation of adsorption is called
Options- A. contact filtration
- B. conventional adsorption
- C. affinity adsorption
- D. ion exchange Discuss
- 8. A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called
Options- A. turbidostat
- B. chemostat
- C. level stat
- D. pH Discuss
- 9. A competitive inhibitor of an enzyme is usually
Options- A. a highly reactive compound
- B. a metal ion such as Hg2+ or Pb2+
- C. structurally similar to the substrate.
- D. water insoluble Discuss
- 10. Which of the following is most likely to cause an increase in the rate of oxygen transfer into a particular aerated fermentation system?
Options- A. Addition of antifoams
- B. Increase in temperature
- C. Increase in stirrer speed
- D. Both (a) and (b) Discuss
More questions
Correct Answer: low biomass yields
Correct Answer: Fructose di-phosphate accumulation inside the cells leading to fermentation
Correct Answer: amount of oxygen that would be removed from the water in order to oxidize pollution
Correct Answer: All of these
Correct Answer: low molecular weight
Correct Answer: Fed batch fermenter
Correct Answer: contact filtration
Correct Answer: chemostat
Correct Answer: structurally similar to the substrate.
Correct Answer: Increase in stirrer speed
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