Pure Cultures

 

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Pure Cultures

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Question 1
Which of the following is a function of cryoprotective agents?
A
for long-term preservation of cultures
B
prevents cell damage due to ice crystal formation
C
prevents formation of ice
D
to trap the liquid nitrogen
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Question 2
Roll-tube technique is used to isolate .....
A
aerobes
B
anaerobes
C
facultatives
D
stringent anaerobes
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Question 3
Which device is used to pick a single bacterial cell from a mixed culture?
A
microscope
B
micropipette
C
microprobe
D
micromanipulator
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Question 4
Nichrome loop wire is used in which of the following techniques?
A
Pour-plate
B
Streak-plate
C
Spread-plate
D
Roll-tube technique
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Question 5
Which of the following are not performed in lyophilization?
A
agar slant is covered with mineral oil
B
cell suspension is frozen at -60 degree to -78 degree C
C
vials are connected to high-vacuum line
D
bacterial sample is dehydrated
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