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6. Which of the following is correct?
A. Ultramicrobacteria or nanobacteria are the dominant bacteria in marine systems
B. Ultramicrobacteria or nanobacteria are so numerous that they are a major food source for heterotrophic flagellates
C. Both (a) and (b)
D. none of the above
7. Coliforms are used as indicator organisms because
A. they are present wherever enteric pathogens are present
B. a testing procedure with great specificity is easy to perform
C. both (a) and (b)
D. none of the above
8. Hyphomycete fungi
A. produce nonmotile tetaradiate conidia
B. grow in leaves and the infected leaves are the preferred food source for some aquatic insects
C. both (a) and (b)
D. none of the above
9. Loss of carbon through the microbial loop in oligotrophic environments is __________ to/than the loss of carbon through the microbial loop in copiotrophic environments.
A. greater
B. lesser
C. approximately equal
D. half
10. 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
A. microbial loop
B. Winogradsky column
C. Redfield ratio
D. Gibbs free energy
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