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Microbes in Aquatic Environment

Microbes in Aquatic Environment
Members of all of the following genera of bacteria typically are found in a maturing Winogradsky column except

Clostridium
Escherichia
Rhodospirillum
Chlorobium

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Microbes in Aquatic Environment
The sulfur pearl of Namibia, Thiomargarita namibiensis

is the worlds largest bacterium
Both (a) and (b)
stores high concentrations of nitrate in a huge internal vacuole which takes up 98% of the organisms volume
is the worlds smallest bacterium

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Microbes in Aquatic Environment
Coliforms are used as indicator organisms because

a testing procedure with great specificity is easy to perform
both (a) and (b)
None of these
they are present wherever enteric pathogens are present

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Microbes in Aquatic Environment
The Redfield ratio is an index of concentration of

nitrogen, potassium and iron
carbon, phosphorous and sulfur
carbon, hydrogen and oxygen
carbon, nitrogen and phosphorous

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Microbes in Aquatic Environment
Which of the following species in water reveal the presence of fecal pollution of human or animal origin?

All of these
Clostridium perfringens
Fecal Streptococci
E.coli

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Microbes in Aquatic Environment
Loss of carbon through the microbial loop in oligotrophic environments is __________ to/than the loss of carbon through the microbial loop in copiotrophic environments.

greater
approximately equal
lesser
half

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