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Growth and Nutrition of Bacteria

Growth and Nutrition of Bacteria
In the exponential phase, the cells and cell mass

decreases
double at a constant rate
are constant
first increases then decreases

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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
C. botulinum
Salmonella
all of these

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

requires less oxygen than is present in air
prefers to grow without oxygen
is killed by oxygen
doesn't use oxygen but can grow in the presence of oxygen

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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
fastidious hetrotrophs
photo-organotrophs

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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
Coulter Counter
Petroff-Hausser chamber
Hemostat

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Growth and Nutrition of Bacteria
The cell reproduction in bacteria may occur by

binary fission
fragmentation
budding
all of these

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