1
Created by Boundless
A microbe is discovered that oxidizes inorganic molecules within the cell to
channel the electrons into respiratory chains for ATP production. This type of
microbe would be best classified as a:
A
chemoautotroph
B
chemoorganotroph
C
chemoinorganotroph
D
chemolithotroph
2
Created by Boundless
Most hydrogen oxidizing bacteria grow under microaerophilic conditions. Which of
the following explains the reason for this preference in this type of environment?
A
The bacteria need high exposure to oxygen because it is
the terminal electron acceptor
B
Oxygen is needed as the terminal electron acceptor but it
inhibits the hydrogenase enzyme
C
Oxygen is needed as the terminal electron acceptor and it
enhances the hydrogenase enzyme
D
The bacteria cannot be exposed to oxygen because it
inhibits the hydrogenase enzyme
3
Created by Boundless
The process of sulfur oxidation begins with inorganic sulfur stored either inside or
outside of the cell. This two step process occurs because:
A
reducing power must be generated for carbon dioxide
fixation via the Calvin cycle
B
hydrogen sulfide (H2S) must be oxidized to reform
elemental sulfur as a supplemental source
C
oxidation of sulfide (H2S) versus thiosulfate (S2O2-3) allows
more protons to be translocated
D
oxidation of thiosulfate (S2O2-3) versus sulfide (H2S) allows
more protons to be translocated
4
Created by Boundless
A microbe is isolated from a soil environment with a low pH. Detailed analysis
shows expression of the enzyme ferric iron reductase at high concentrations.
Based on these observations, which category of microbes would they be classified
under?
A
Ferrous iron-oxidizing microbes, specifically
microaerophiles
B
None of these choices
C
Ferrous iron-oxidizing microbes, specifically acidophiles
D
Ferrous iron-oxidizing microbes, specifically anaerobic
photosynthetic bacteria
5
Created by Boundless
A new soil bacterium is identified and further analysis shows it can be classified as
a bacteria that can carry out nitrification. This classification indicates that:
A
this bacterium can either oxidize ammonia to nitrite or
oxidize nitrite to nitrate
B
this bacterium can oxidize nitrite to nitrate
C
this bacterium can oxidize ammonia to nitrite
D
this bacterium can directly oxidize ammonia to nitrate
6
Created by Boundless
Which of the following are products of the microbial process anammox
metabolism?
A
NO2-
B
N2
C
NH4+ + NO2-
D
N2 + 2H20
7
Created by Boundless
Anammox organisms are major contributors to the nitrogen cycle on a global level.
A key intermediate produced during anammox metabolism which is considered
poisonous to most living organisms, includes:
A
ladderane lipids
B
nitrite
C
ammonium
D
hydrazine
8
Created by Boundless
Which of the following is a characteristic of Rhodococcus that makes it
experimentally advantageous?
A
It has a simple developmental cycle
B
It can produce hydrogen via nitrogenase catalysis
C
It has a large bacterial chromosome
D
It has a slow growth rate which allows for easy monitoring
9
Created by Boundless
Polycyclic aromatic hydrocarbons (PAH) are carcinogenic atmospheric pollutants.
There are microorganisms capable of transforming and degrading PAHs from the
environment. The use of fungi to remove contaminants such as PAH is called:
A
mycoremediation
B
bioremediation
C
phytoremediation
D
natural attenuation