GROWTH AND NUTRITION OF BACTERIA QUIZ

The average size of cells during the exponential phase of growth is

equal to the lag phase

lesser than the lag phase

greater than the lag phase

none of these

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The term facultative anaerobe refers to an organism that

requires less oxygen than is present in air

is killed by oxygen

doesn't use oxygen but tolerates it

uses oxygen when present or grows without oxygen when absent

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

a thermophile

too small to see

incapable of cell division

an obligate aerobe

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Organisms, using organic compounds as electron donors are called

phototrophs

chemotrophs

organotrophs

lithotrophs

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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

fastidious hetrotrophs

chemo-lithotrophs

photo-organotrophs

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Starvation proteins are produced by a culture during which of the following segments of the growth curve?

Stationary phase

Exponential phase

Lag phase

Death phase

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The organism which obtain their energy from chemicals are designated as

chemotrophs

autotrophs

prototrophs

organotrophs

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

lesser than that produces three generations per hour

equal to that produces three generations per hour

greater than that produces three generations per hour

None of these

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Which of the following organisms typically get their carbon for biosynthesis from carbon dioxide?

Aerobic, glucose-respiring bacteria (aerobic respiration)

Glucose-fermenting bacteria (fermentation)

Anaerobic, glucose-respiring bacteria (anaerobic respiration)

Ammonia-oxidizing bacteria (chemolithotrophic bacteria)

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Generation time is

obtained by expression t/n, where t = time interval, n = number of generation

time required for the population to double

both (a) and (c)

time required for the initial adjustment

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