E-PolyLearning

46. Red extreme halophiles”, are members of the archaebacterial which cannot grow with less than 12 to 15 percent NaCl.
a. True
b. False
c. May be
d. Can't say
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Answer: (a).True

47. Which of the following are functions of water in the culture medium?
a. nutrients must be in aqueous solution
b. cofactor of enzymes
c. provides resistance to sudden transient temperature changes
d. it is a chemical reactant, nutrients must also be present in aqueous solution and provides resistance to sudden temperature changes.
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Answer: (d).it is a chemical reactant, nutrients must also be present in aqueous solution and provides resistance to sudden temperature changes.

48. Chromatium okenii uses which of the following compound as electron donor?
a. Hydrogen sulphide
b. Fatty acids
c. Alcohol
d. Succinate
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Answer: (a).Hydrogen sulphide

49. Which of the following bacteria can grow both as chemolithotrophs or as chemoorganotrophs?
a. Nitrosomonas sp.
b. Pseudomonas pseudoflava
c. Rhodospirillum rubrum
d. Chromatium okenii
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Answer: (b).Pseudomonas pseudoflava

50. Which of the following is a characteristic of beef extract?
a. product resulting from the digestion of proteinaceous materials
b. aqueous extract of lean beef tissue
c. aqueous extract of yeast cells
d. complex carbohydrate obtained from certain marine algae
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Answer: (b).aqueous extract of lean beef tissue