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Growth and Nutrition of Bacteria

Growth and Nutrition of Bacteria
Which of the following procedures uses a photocell to measure absorbance of a culture to regulate the flow of culture media?

Trubidostat
Petroff-Hausser chamber
Coulter Counter
Hemostat

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Growth and Nutrition of Bacteria
Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as

chemo-lithotrophs
chemotrophs
photo-organotrophs
fastidious hetrotrophs

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Growth and Nutrition of Bacteria
The term facultative anaerobe refers to an organism that

uses oxygen when present or grows without oxygen when absent
requires less oxygen than is present in air
doesn't use oxygen but tolerates it
is killed by oxygen

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Growth and Nutrition of Bacteria
Bacteria and fungi multiply best

none of these
above 38°C
below 16°C
between 16-38°C

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Growth and Nutrition of Bacteria
Generation time of Escherichia coli is

20 days
20 minutes
200 hours
20 hours

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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

all of these
Salmonella
S. aureus
C. botulinum

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