| 36. | Which of the following bacteria can grow in acidic pH? |
| a. | Vibrio cholerae |
| b. | Lactobacilli |
| c. | Shigella |
| d. | Salmonella |
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Answer: (b).Lactobacilli
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| 37. | Cell size and cell number can be measured using |
| a. | hemocytometer |
| b. | coulter counter |
| c. | petroff-hausser counting chamber |
| d. | none of these |
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Answer: (b).coulter counter
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| 38. | Which of the following is used for the proper maintenance and preservation of pure cultures? |
| a. | Periodic transfer to fresh media |
| b. | Preservation by overlaying cultures with mineral oil |
| c. | Preservation by lyophilization |
| d. | All of the above |
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Answer: (d).All of the above
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| 39. | In the process of freeze drying, a dense cell suspension is placed in small vials and is frozen at |
| a. | -60 to -78°C |
| b. | -20 to -30°C |
| c. | -30 to -48°C |
| d. | -48 to -58°C |
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Answer: (a).-60 to -78°C
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| 40. | The solidifying agent commonly used in preparation of media is/are |
| a. | agar |
| b. | silica gel |
| c. | both (a) and (b) |
| d. | none of these |
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Answer: (c).both (a) and (b)
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