36. | Which of the following bacteria can grow in acidic pH? |
a. | Vibrio cholerae |
b. | Lactobacilli |
c. | Shigella |
d. | Salmonella |
View Answer Report Discuss 50-50! |
Answer: (b).Lactobacilli
|
37. | Cell size and cell number can be measured using |
a. | hemocytometer |
b. | coulter counter |
c. | petroff-hausser counting chamber |
d. | none of these |
View Answer Report Discuss 50-50! |
Answer: (b).coulter counter
|
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 |
View Answer Report Discuss 50-50! |
Answer: (d).All of the above
|
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 |
View Answer Report Discuss 50-50! |
Answer: (a).-60 to -78°C
|
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 |
View Answer Report Discuss 50-50! |
Answer: (c).both (a) and (b)
|