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MCQs

Total Questions : 43 | Page 2 of 5 pages
Question 11. The Zygomonas has a merit over yeast because
  1.    it has high tolerance to ethanol
  2.    All of these
  3.    it has more specific growth rate
  4.    it has more osmotic tolerance to higher sugar concentration
 Discuss Question
Answer: Option B. -> All of these
Question 12. After the fermentation is over, ethanol is recovered by
  1.    distillation
  2.    centrifugation
  3.    filtration
  4.    cell disintegration
 Discuss Question
Answer: Option A. -> distillation
Question 13. How is air supply to the fermentor sterilized?
  1.    Filtration through fibrous material
  2.    Filtration through granular material
  3.    All of these
  4.    By heat filtration
 Discuss Question
Answer: Option C. -> All of these
Question 14. Which of the following organism is not used in any of the traditional industrial fermentation?
  1.    Bacillus
  2.    Pseudomonas
  3.    E. coli
  4.    Yeast
 Discuss Question
Answer: Option C. -> E. coli
Question 15. Which of the following microorganisms help in the ethanol production?
  1.    All of these
  2.    Saccharomyces cerevisiae
  3.    Zygomonas mobilis
  4.    Saccharomyces uvarum
 Discuss Question
Answer: Option A. -> All of these
Question 16. What are the fermentation conditions for the ethanol production?
  1.    pH 5; temperature 35°C
  2.    pH 5; temperature 30°C
  3.    pH 6; temperature 30°C
  4.    pH 6; temperature 35°C
 Discuss Question
Answer: Option A. -> pH 5; temperature 35°C
Question 17. Which of the following is used for agitation in a fermentor?
  1.    Impeller
  2.    All of these
  3.    Baffles
  4.    Sparger
 Discuss Question
Answer: Option A. -> Impeller
Question 18. To maintain aseptic conditions during fermentation which of the following is needed?
  1.    All of these
  2.    Sterilization of air supply
  3.    Aeration and agitation
  4.    Sterilization of fermentor
 Discuss Question
Answer: Option A. -> All of these
Question 19. High ethanol concentration
  1.    inhibits bacterial growth
  2.    inhibits yeast growth
  3.    promotes bacterial growth
  4.    promotes yeast growth
 Discuss Question
Answer: Option B. -> inhibits yeast growth
Question 20.  If starch containing substrates are used for ethanol production, yeast strain can't be used directly because
  1.    it doesn't contain amylases to hydrolyze starch
  2.    starch is not a suitable substrate for the production of ethanol
  3.    it is converted to pentose sugar
  4.    none of the above
 Discuss Question
Answer: Option A. -> it doesn't contain amylases to hydrolyze starch

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