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Growth and Nutrition of Bacteria

Growth and Nutrition of Bacteria
What are the extrinsic factors for the microbial growth?

composition of gas phase
all of these
storage temperature
humidity

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Growth and Nutrition of Bacteria
Autotrophic bacteria are those which

make their own food
produce a blue-green pigment
form a long chain glycocalyx
are highly susceptible to penicillin

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Growth and Nutrition of Bacteria
A synergistic effect is observed when

one organism produces a growth factor utilized by another
microbial alteration of pH, aw, Eh favours the growth of another
All of these
one organism removes an inhibitory substance for another

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Growth and Nutrition of Bacteria
Postgates assay technique is useful in determining if a cell is viable even though it is

incapable of cell division
a thermophile
too small to see
an obligate aerobe

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Growth and Nutrition of Bacteria
A microbe, which grows at temperatures above 95° C is most likely to be

an archaean
a fungus
a protozoan
none of these

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

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

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