Ethanol Production(Biotechnology ) Questions and Answers

Question 1. 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 these
Explanation:-
Answer: Option A. -> it doesn't contain amylases to hydrolyze starch
Question 2. Which of the following is used for aeration in a fermentor?
  1.    Baffles
  2.    Sparger
  3.    All of these
  4.    Impeller
Explanation:-
Answer: Option B. -> Sparger
Question 3. Which of the following is used to check vortex and to improve aeration efficiency in a fermentor?
  1.    Impeller
  2.    Baffles
  3.    Sparger
  4.    All of these
Explanation:-
Answer: Option B. -> Baffles
Question 4. Ethanol is produced by
  1.    both (a) and (b)
  2.    none of these
  3.    batch fermentation
  4.    continuous fermentation
Explanation:-
Answer: Option A. -> both (a) and (b)
Question 5. What are different substrates used for ethanol production?
  1.    Waste product from wood or processed wood
  2.    Starch containing substrate
  3.    All of these
  4.    Juices from sugarcane or molasses or sugar beet
Explanation:-
Answer: Option C. -> All of these
Question 6. As the fermentation for the ethanol production is over, the cells are separated to get the biomass of yeast cells that is used
  1.    for next fermentation
  2.    All of these
  3.    as manure
  4.    as single cell protein for animal feed
Explanation:-
Answer: Option D. -> as single cell protein for animal feed
Question 7. Yeast is used in the production of
  1.    curd
  2.    cheese
  3.    ethyl alcohol
  4.    acetic acid
Explanation:-
Answer: Option C. -> ethyl alcohol
Question 8. Candida utilis is used for the fermentation of waste sulphate liquor since it ferments
  1.    pentoses only
  2.    both hexoses and pentoses
  3.    none of these
  4.    hexoses only
Explanation:-
Answer: Option B. -> both hexoses and pentoses
Question 9. The fermentor can be sterilized by
  1.    keeping it in the oven
  2.    boiling
  3.    steam under pressure
  4.    all of these
Explanation:-
Answer: Option C. -> steam under pressure
Question 10. S cerevisiae start producing ethanol with in
  1.    10 h
  2.    24 h
  3.    15 h
  4.    12 h
Explanation:-
Answer: Option D. -> 12 h
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