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- Question
Milk digestibility is improved by using
Options- A. RNase
- B. lactase
- C. ?-amylase
- D. none of these
- Correct Answer
- lactase
- 1. Sanitizer used specifically for vitreous enamel are
Options- A. strong alkalis
- B. strong acids
- C. weak alkali with sodium silicate
- D. none of these Discuss
- 2. The optical density sometimes drops during the lag phase because
Options- A. cells tend to grow without dividing leading to a decrease in the surface area to volume ratio
- B. of fast cell growth causing them to fill up with DNA
- C. cells swell up with water
- D. cells swell up with RNA Discuss
- 3. Turbulent flow range of mixing speed is obtained for
Options- A. Rei<10
- B. 10<Rei<104
- C. Rei>104
- D. None of these Discuss
- 4. In a batch reactor specific growth rate
Options- A. remains constant throughout the process
- B. increases exponentially
- C. changes during the fermentation
- D. is highest during the stationary phase Discuss
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
More questions
Correct Answer: weak alkali with sodium silicate
Correct Answer: cells tend to grow without dividing leading to a decrease in the surface area to volume ratio
Correct Answer: Rei>104
Correct Answer: changes during the fermentation
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
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