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Biotechnology - 67

1-	To maintain aseptic conditions during fermentation which of the following is needed?
	A -	Sterilization of fermentor
	B -	Sterilization of air supply
	C -	Aeration and agitation
	D -	All of these
2-	High ethanol concentration
	A -	promotes yeast growth
	B -	inhibits yeast growth
	C -	promotes bacterial growth
	D -	inhibits bacterial growth
3-	Vinegar is typically produced in fed batch reactors because
	A -	a fed batch reactor can be used to maintain low acetic acid concentrations
	B -	a fed batch reactor can be used to maintain low ethanol concentrations
	C -	acetic acid bacteria tend to ferment at high ethanol concentrations
	D -	All of the above
4-	For the recovery of citric acid after fermentation, Ca(OH)₂ is added to the slurry to
	A -	precipitate calcium carbonate
	B -	precipitate calcium phosphate
	C -	precipitate calcium citrate
	D -	precipitate calcium sulphate
5-	Which of the following microorganism is used for the production of citric acid?
	A -	Lactobacillus bulgaricus
	B -	Saccharomyces cerevisiae
	C -	Aspergillus niger
	D -	Streptococcus lactis
6-	Sugar content of the fermentation medium for citric acid is maintained at
	A -	10-15%
	B -	15-20%
	C -	20-25 %
	D -	25-30 %
7-	Spirit vinegar is produced from
	A -	fruit juices
	B -	malted grain
	C -	ethanol
	D -	ale
8-	What is the pH of the medium when sucrose is used as substrate for the production of citric acid?
	A -	3
	B -	4
	C -	5
	D -	6
9-	In liquid surface culture process for the fermentation to produce citric acid,
	A -	A. niger is used with solid substrate as sweet potato
	B -	A. niger floats on the surface of solution
	C -	Fungal mycelium grows through out the solution in a deep tank
	D -	Both (a) and (b)
10-	In koji process for the fermentation to produce citric acid,
	A -	A. niger is used with solid substrate as sweet potato
	B -	A. niger floats on the surface of solution
	C -	Fungal mycelium grows through out the solution in a deep tank
	D -	Both (a) and (b)

[Người đăng: Thành Lãm - ST]

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