| 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
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| 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.
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| 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
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| 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
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| 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
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