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Biotechnology - 68

1-	What is the pH of the medium when molasses is used as substrate for the production of citric acid?
	A -	3
	B -	4
	C -	5
	D -	6
2-	Which of the following nitrogen sources is added in the fermentation medium of citric acid production?
	A -	Ammonium salt
	B -	Urea
	C -	Peptone
	D -	Both (a) and (b)
3-	In submerged 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)
4-	Which substrate is used in the fermentation of citric acid?
	A -	Beet molasses
	B -	Sucrose
	C -	Starch hydrolysate
	D -	All of these
5-	Alegar is a type of vinegar produced from
	A -	fruit juices
	B -	malted grain
	C -	ethanol
	D -	ale
6-	During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?
	A -	HCl
	B -	HNO₃
	C -	H₂SO₄
	D -	None of these
7-	Vinegar production consists of
	A -	aerobic fermentation followed by anaerobic fermentation
	B -	anaerobic fermentation followed by aerobic fermentation
	C -	anaerobic fermentation
	D -	aerobic fermentation
8-	Cider vinegar is produced from
	A -	fruit juices
	B -	malted grain
	C -	ethanol
	D -	ale
9-	Ethanol is oxidized to acetic acid aerobically using
	A -	Acetobacter
	B -	Gluconobacter
	C -	Lactobacillus
	D -	Both (a) and (b)
10-	Malt vinegar is produced from
	A -	fruit juices
	B -	malted grain
	C -	ethanol
	D -	ale

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