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- Question
Chemostats work on the principle of
Options- A. maintaining constant volume of culture medium
- B. maintaining continuous flow of nutrients
- C. maintaining uniform nutrients concentration
- D. operating at higher pressure
- Correct Answer
- maintaining uniform nutrients concentration
- 1. Turbidostat is recommended when continuous fermentation needs to be carried out at
Options- A. high dilution rates near the washout point
- B. low dilution rates near the washout point
- C. moderate dilution rates near the washout point
- D. any intensity of dilution rates near the washout point Discuss
- 2. Bubble free aeration systems requires
Options- A. silicone tubing or gas permeable membranes to facilitate gas transfer
- B. carbon dioxide instead of air to supply oxygen
- C. silicone tubing or gas permeable membranes to remove carbon dioxide by oxygen in the form of hydrogen peroxide
- D. filled headspace of the reactor with carbon dioxide Discuss
- 3. Which of the following is not classified as an axial flow impeller?
Options- A. A propeller
- B. A marine impeller
- C. A Rushton turbine
- D. A hydrofoil impeller Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. The stage wise operation of adsorption is called
Options- A. contact filtration
- B. conventional adsorption
- C. affinity adsorption
- D. ion exchange Discuss
More questions
Correct Answer: high dilution rates near the washout point
Correct Answer: silicone tubing or gas permeable membranes to facilitate gas transfer
Correct Answer: A Rushton turbine
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
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