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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

Chlorobium
Rhodospirillum
Clostridium
Escherichia

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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.

half
lesser
approximately equal
greater

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Microbes in Aquatic Environment
Because it can be used with a variety of media and allow a resuscitation step the __________ technique has become the common and often preferred method of evaluating the microbiological characteristics of water.

Winogradsky
MUG
most probable number
membrane filtration

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Microbes in Aquatic Environment
All of the following species are considered coliforms except

Salmonella typhi
Klebsiella pneumoniae
Escherichia coli
Enterobacter aerogenes

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Microbes in Aquatic Environment
Metabolism of dissolved organic material released by phytoplankton allows heterotrophic bacteria to become part of the particulate organic matter that is passed up the food web to be metabolized and released as mineral elements and CO2 at each transfer. This sentence describes the

microbial loop
Winogradsky column
Redfield ratio
Gibbs free energy

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Microbes in Aquatic Environment
Coliforms are used as indicator organisms because

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

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