Microbes in Aquatic Environment
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Trickling
filter comes under _____________.
a. primary
treatment
b. secondary treatment
c. tertiary
treatment
d. none
of these
Which
of the following species in water reveal the presence of fecal pollution of
human or animal origin?
a. E.coli
b. Fecal
Streptococci
c. Clostridium
perfringens
d. All of these
Activated
sludge undergoes _____________.
a. Primary
treatment
b. Secondary treatment
c. Tertiary
treatment
d. any
of these
Removal
of solids is generally considered as a _____________.
a. Primary treatment
b. Secondary
treatment
c. Tertiary
treatment
d. None
of these
The
sulfur pearl of Namibia, Thiomargarita namibiensis _____________.
a. is
the worlds largest bacterium
b. stores
high concentrations of nitrate in a huge internal vacuole which takes up 98% of
the organisms volume
c. Both (a) and (b)
d. is
the worlds smallest bacterium
The
Redfield ratio is an index of concentration of _____________.
a. carbon,
hydrogen and oxygen
b. nitrogen,
potassium and iron
c. carbon, nitrogen and phosphorous
d. carbon,
phosphorous and sulfur
Chemical
precipitation of phosphorus is _____________.
a. primary
treatment
b. secondary
treatment
c. tertiary treatment
d. both
(a) and (b)
All
of the following species are considered coliforms except _____________.
a. Enterobacter
aerogenes
b. Klebsiella
pneumoniae
c. Salmonella typhi
d. Escherichia
coli
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
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
Which
of the following is correct?
a. A
Winogradsky column is used to filter out microorganisms from a water sample
taken from a deep black smoker
b. A Winogradsky column is used to
demonstrate interactions and gradients that occur in aquatic environments
c. Both
(a) and (b)
d. A
Winogradsky column is used to filter out microorganisms from non-aquatic
environments
The
rate of flux of oxygen in air is __________ to/than the rate of flux of oxygen
in water.
a. greater
b. lesser
c. approximately
equal
d. half
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
Which
of the following is correct?
a. All members of Hyphomycetes are also
members of Fungi, but not all members of Fungi are members of Hyphomycetes
b. All
members of Fungi are also members of Hyphomycetes, but not all members of
Hyphomycetes are members of Fungi
c. All
members of Hyphomycetes are members of Fungi, and all members of Fungi are
members of Hyphomycetes
d. No
member of Hyphomycetes is a member of Fungi
The
amount of oxygen dissolved in hypolimnion water in the winter is __________
to/than the amount of oxygen dissolved in hypolimnion water in the summer
a. greater
b. lesser
c. approximately
equal to
d. half
Members
of all of the following genera of bacteria typically are found in a maturing
Winogradsky column except _____________.
a. Clostridium
b. Rhodospirillum
c. Chlorobium
d. Escherichia
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.
a. most
probable number
b. Winogradsky
c. MUG
d. membrane filtration
__________
is an environment like __________ where microorganisms are functioning in an
extremely thin film of water and where oxygen-containing air is close to them.
a. low
oxygen diffusion environment; soils
b. high oxygen diffusion environment; soils
c. low
oxygen diffusion environment; lakes
d. high
oxygen diffusion environment; lakes
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
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