GROWTH AND NUTRITION OF BACTERIA QUIZ

Bacteria and fungi multiply best

below 16°C

between 16-38°C

none of these

above 38°C

TRUE ANSWER : ?
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Organisms, using organic compounds as electron donors are called

organotrophs

lithotrophs

chemotrophs

phototrophs

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Postgates assay technique is useful in determining if a cell is viable even though it is

incapable of cell division

a thermophile

an obligate aerobe

too small to see

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The microorganisms that grow best in a low-oxygen environment is called a (n)

facultative

aerobe

microaerophile

anaerobe

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

chemotrophs

chemo-lithotrophs

photo-organotrophs

fastidious hetrotrophs

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The generation time of a culture that produces two generations per hour is

equal to that produces three generations per hour

None of these

greater than that produces three generations per hour

lesser than that produces three generations per hour

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The growth is normally expressed as __________ in turbidimetric measurement

optical density

cfu/ml

cells per ml

mg N2 /ml

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The period between inoculation of bacteria in a culture medium and beginning of multiplication is known as

log phase

stationary phase

decline phase

lag phase

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The term facultative anaerobe refers to an organism that

doesn't use oxygen but tolerates it

requires less oxygen than is present in air

uses oxygen when present or grows without oxygen when absent

is killed by oxygen

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A synergistic effect is observed when

All of these

microbial alteration of pH, aw, Eh favours the growth of another

one organism produces a growth factor utilized by another

one organism removes an inhibitory substance for another

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