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Growth and Nutrition of Bacteria

Growth and Nutrition of Bacteria
Which of the following is used to grow bacterial cultures continuously?

Hemostat
Petroff-Hausser chamber
Chemostat
Coulter Counter

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Growth and Nutrition of Bacteria
Generation time of Escherichia coli is

20 minutes
200 hours
20 hours
20 days

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Growth and Nutrition of Bacteria
The growth is normally expressed as __________ in turbidimetric measurement

mg N2 /ml
cells per ml
optical density
cfu/ml

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Growth and Nutrition of Bacteria
The organism which grows best above 45°C are called

thermophilic
psychrophilic
any of these
mesosphilic

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Growth and Nutrition of Bacteria
Antimicrobial constituents for the microbial growth in foods are

none of these
both (a) and (b)
intrinsic factor
extrinsic factor

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Growth and Nutrition of Bacteria
The combination of low levels of NaCl, NaNO3 (sodium nitrate), and slightly acid pH can prevent multiplication and toxin formation of

S. aureus
Salmonella
C. botulinum
all of these

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