Chamberlain Microbiology Exam 2 Predictor Test
CHAMBERLAIN MICROBIOLOGY EXAM 2 PREDICTOR TEST WITH
250 VERIFIED QUESTIONS AND CORRECT ANSWERS WITH
DETAILED RATIONALES GRADED A+ / MICROBIOLOGY EXAM 1
PREP TEST LATEST
Claire Reimers & her colleagues have developed & deployed benthic microbial fuel
cells (BMFC) to power sensors that monitor O2 levels, temperature & other data
at the ocean floor.
What are the advantages of using BMFC to power ocean-monitoring devices?
Choose one:
A. The devices need a source of energy that is continuous but short lived.
B. The devices need a source of energy that is intermittent & short lived.
C. The devices need a source of energy that is intermittent but will last for many
years.
D. The devices need a source of energy that is continuous & will last for many
years. - Correct Answer-D. The devices need a source of energy that is continuous
& will last for many years.
Extracellular electron shuttles generally accept electrons directly from which of
the following materials?
Choose one:
outer membrane cytochromes
nanowires
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, Chamberlain Microbiology Exam 2 Predictor Test
respiratory chain quinones
NADH
external oxidants - Correct Answer-outer membrane cytochromes
Which of the following chemical pairs provides a metabolic strategy that is an
example of both lithotrophy and anaerobic respiration?
Choose one:
A. electron donor NH3; electron acceptor O2
B. electron donor glucose; electron acceptor Fe3+
C. electron donor H2; electron acceptor SO42-
D. electron donor glucose; electron acceptor O2
E. electron donor Fe2+; electron acceptor O2 - Correct Answer-C. electron donor
H2; electron acceptor SO42-
All of the following types of metabolism use a membrane-associated electron
transport system (ETS) EXCEPT for . . .
A) mitochondrial respiration
B) fermentation
C) organotrophy
D) phototrophy
E) lithotrophy - Correct Answer-B. fermentation
Redox reactions refer to a pair of reactions in which a particular oxidation is
coupled to a corresponding reduction.Although neither can occur independently
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, Chamberlain Microbiology Exam 2 Predictor Test
of the other, it can be helpful to write each oxidation or reduction as a half
reaction to help us understand & to calculate the flow of energy.In this exercise,
sort each listed half reaction as either an oxidation or a reduction. - Correct
Answer-Oxidation:
H2 → 2H+ + 2e-
HS- → S0 + 2H+ + e-
NADH + H+ → NAD+ + 2H+ + 2e-
Ca0 → Ca+2 + 2e-
Reduction:
½O2 + 2H+ + 2e- → H2O
FAD + 2H+ + 2e- → FADH2
Fe3+ + e- → Fe2+
acetaldehyde + 2e- + 2 H+ → ethanol
What process is illustrated by the diagram below?
A. fermentation
B. reverse electron flow
C. anaerobic respiration
D. aerobic respiration
E. glycolysis - Correct Answer-D. aerobic respiration
Table 14.1 is called the "electron tower" & it is a convenient way of organizing
biologically important redox pairs.All of the half reactions are written as
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, Chamberlain Microbiology Exam 2 Predictor Test
reductions in the Table.Reactions with the most negative reduction potentials (E°')
& positive standard free energy changes (ΔG°') are at the top,while those
reactions with the most positive E°' & most negative ΔG°' values are at the
bottom.This means that the reduced forms of the couples (in the blue column)
near the top are good electron donors,while the oxidized forms of redox pairs (in
the red column) near the bottom are good electron acceptors.
Use the values in the chart above to estimate whether a bacterium could grow by
oxidizing NO2- to NO3- when using elemental sulfur (S0) as a terminal electron
acceptor. Choose one:
A. Yes, because the ΔG°' of the combined reaction would be positive.
B. No, because the ΔG°' of the combined reaction would be negative.
C - Correct Answer-C. No, because the ΔG°' of the combined reaction would be
positive.
Consider the case of Acidothiobacillus ferridoxans, an acidophilic iron oxidizer that
obtains energy from the oxidation of ferrous iron (Fe2+) to ferric iron (Fe3+) at pH
2.Under these conditions, the E°' of the Fe3+/Fe2+ redox pair is extremely
electropositive (+770 mV), close to the E°' of the half O2/H2O pair (+820 mV).You
can see that very little potential energy is to be gained from iron oxidation when
there are equimolar concentrations of reactants & products.In reality, A.
ferridoxans is restricted to iron-rich habitats such as acid-mine-drainage
streams.Iron oxidizers can be successful in these environments because a ten-fold
ratio of reactants to products . . .
Choose one:
A. increases the E°' by 60 mV per electron.
B. decreases the E°' by 60 mV per electron.
C. decreases the E°' by 60 mV per proton.
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CHAMBERLAIN MICROBIOLOGY EXAM 2 PREDICTOR TEST WITH
250 VERIFIED QUESTIONS AND CORRECT ANSWERS WITH
DETAILED RATIONALES GRADED A+ / MICROBIOLOGY EXAM 1
PREP TEST LATEST
Claire Reimers & her colleagues have developed & deployed benthic microbial fuel
cells (BMFC) to power sensors that monitor O2 levels, temperature & other data
at the ocean floor.
What are the advantages of using BMFC to power ocean-monitoring devices?
Choose one:
A. The devices need a source of energy that is continuous but short lived.
B. The devices need a source of energy that is intermittent & short lived.
C. The devices need a source of energy that is intermittent but will last for many
years.
D. The devices need a source of energy that is continuous & will last for many
years. - Correct Answer-D. The devices need a source of energy that is continuous
& will last for many years.
Extracellular electron shuttles generally accept electrons directly from which of
the following materials?
Choose one:
outer membrane cytochromes
nanowires
1|Page
, Chamberlain Microbiology Exam 2 Predictor Test
respiratory chain quinones
NADH
external oxidants - Correct Answer-outer membrane cytochromes
Which of the following chemical pairs provides a metabolic strategy that is an
example of both lithotrophy and anaerobic respiration?
Choose one:
A. electron donor NH3; electron acceptor O2
B. electron donor glucose; electron acceptor Fe3+
C. electron donor H2; electron acceptor SO42-
D. electron donor glucose; electron acceptor O2
E. electron donor Fe2+; electron acceptor O2 - Correct Answer-C. electron donor
H2; electron acceptor SO42-
All of the following types of metabolism use a membrane-associated electron
transport system (ETS) EXCEPT for . . .
A) mitochondrial respiration
B) fermentation
C) organotrophy
D) phototrophy
E) lithotrophy - Correct Answer-B. fermentation
Redox reactions refer to a pair of reactions in which a particular oxidation is
coupled to a corresponding reduction.Although neither can occur independently
2|Page
, Chamberlain Microbiology Exam 2 Predictor Test
of the other, it can be helpful to write each oxidation or reduction as a half
reaction to help us understand & to calculate the flow of energy.In this exercise,
sort each listed half reaction as either an oxidation or a reduction. - Correct
Answer-Oxidation:
H2 → 2H+ + 2e-
HS- → S0 + 2H+ + e-
NADH + H+ → NAD+ + 2H+ + 2e-
Ca0 → Ca+2 + 2e-
Reduction:
½O2 + 2H+ + 2e- → H2O
FAD + 2H+ + 2e- → FADH2
Fe3+ + e- → Fe2+
acetaldehyde + 2e- + 2 H+ → ethanol
What process is illustrated by the diagram below?
A. fermentation
B. reverse electron flow
C. anaerobic respiration
D. aerobic respiration
E. glycolysis - Correct Answer-D. aerobic respiration
Table 14.1 is called the "electron tower" & it is a convenient way of organizing
biologically important redox pairs.All of the half reactions are written as
3|Page
, Chamberlain Microbiology Exam 2 Predictor Test
reductions in the Table.Reactions with the most negative reduction potentials (E°')
& positive standard free energy changes (ΔG°') are at the top,while those
reactions with the most positive E°' & most negative ΔG°' values are at the
bottom.This means that the reduced forms of the couples (in the blue column)
near the top are good electron donors,while the oxidized forms of redox pairs (in
the red column) near the bottom are good electron acceptors.
Use the values in the chart above to estimate whether a bacterium could grow by
oxidizing NO2- to NO3- when using elemental sulfur (S0) as a terminal electron
acceptor. Choose one:
A. Yes, because the ΔG°' of the combined reaction would be positive.
B. No, because the ΔG°' of the combined reaction would be negative.
C - Correct Answer-C. No, because the ΔG°' of the combined reaction would be
positive.
Consider the case of Acidothiobacillus ferridoxans, an acidophilic iron oxidizer that
obtains energy from the oxidation of ferrous iron (Fe2+) to ferric iron (Fe3+) at pH
2.Under these conditions, the E°' of the Fe3+/Fe2+ redox pair is extremely
electropositive (+770 mV), close to the E°' of the half O2/H2O pair (+820 mV).You
can see that very little potential energy is to be gained from iron oxidation when
there are equimolar concentrations of reactants & products.In reality, A.
ferridoxans is restricted to iron-rich habitats such as acid-mine-drainage
streams.Iron oxidizers can be successful in these environments because a ten-fold
ratio of reactants to products . . .
Choose one:
A. increases the E°' by 60 mV per electron.
B. decreases the E°' by 60 mV per electron.
C. decreases the E°' by 60 mV per proton.
4|Page
