1|Page
MMBIO EXAM 3 2025 |CERTIFIED QUESTIONS
WITH ANSWERS
Typical signs and symptoms of tuberculosis include which of the
following?
All of the above
Cough
Night time sweats
Hemoptysis
Anergy - correct -answer-All of the above
Cyanobacteria are thought to have played an important role in the
development of planet Earth because they produced much of the
oxygen (O2) that was required for larger and more complex organisms
to evolve. What kind of metabolism do you propose cyanobacteria used
to generate O2
Anaerobic respiration
Anoxygenic photosynthesis
Oxygenic photosynthesis
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Aerobic respiration
Fermentation - correct -answer-Oxygenic photosynthesis
Chemolithotrophs, like hydrogen-oxidizing bacteria, use CO2 as a
carbon source. By which process do they fix CO2 so that they can make
biosynthetic precursor molecules and new cell parts?
Tricarboxylic acid cycle
Calvin-Benson cycle
Fermentation
Glycolysis
Kreb's cycle - correct -answer-Calvin-Benson cycle
Candidatus Brocadia anammoxidans is a bacterium that uses
ammonium (NH4+) as an energy/electron source and nitrite (NO2-) as
an electron acceptor when oxygen is absent. Based on this information,
propose the metabolic strategy that B. anammoxidans uses for growth.
Chemolithotrophy
Photoautotrophy
Chemoheterotrophy
Photoheterotrophy - correct -answer-Chemolithotrophy
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Iron (II)-oxidation yields very little energy when Gallionella ferruginea
bacteria use Fe2+ as an energy source (only about 29 kJ mol-1). Their
growth is also inhibited by the rapid abiotic and aerobic oxidation of
Fe2+. This is a conundrum because the bacteria actually require oxygen
in order to grow! Assuming that they can scavenge Fe2+ efficiently, how
might these organisms thrive under such conditions?
They might use alternative electron acceptors, such as nitrate (NO3-).
They can secrete Fe3+
They may fix more CO2 using the Calvin-Benson cycle.
They may process/eat more Fe2+ in order to generate more energy
They might regenerate NAD+ more efficiently. - correct -answer-They
may process/eat more Fe2+ in order to generate more energy
The phase of microbial growth in which DNA repair occurs, nutrient
uptake and cell size increases, but yet in which the cells are not dividing
occurs is the ____________ phase.
Lag
Log/Exponential
Death/Decline
Stationary - correct -answer-Lag
MMBIO EXAM 3 2025 |CERTIFIED QUESTIONS
WITH ANSWERS
Typical signs and symptoms of tuberculosis include which of the
following?
All of the above
Cough
Night time sweats
Hemoptysis
Anergy - correct -answer-All of the above
Cyanobacteria are thought to have played an important role in the
development of planet Earth because they produced much of the
oxygen (O2) that was required for larger and more complex organisms
to evolve. What kind of metabolism do you propose cyanobacteria used
to generate O2
Anaerobic respiration
Anoxygenic photosynthesis
Oxygenic photosynthesis
,2|Page
Aerobic respiration
Fermentation - correct -answer-Oxygenic photosynthesis
Chemolithotrophs, like hydrogen-oxidizing bacteria, use CO2 as a
carbon source. By which process do they fix CO2 so that they can make
biosynthetic precursor molecules and new cell parts?
Tricarboxylic acid cycle
Calvin-Benson cycle
Fermentation
Glycolysis
Kreb's cycle - correct -answer-Calvin-Benson cycle
Candidatus Brocadia anammoxidans is a bacterium that uses
ammonium (NH4+) as an energy/electron source and nitrite (NO2-) as
an electron acceptor when oxygen is absent. Based on this information,
propose the metabolic strategy that B. anammoxidans uses for growth.
Chemolithotrophy
Photoautotrophy
Chemoheterotrophy
Photoheterotrophy - correct -answer-Chemolithotrophy
, 3|Page
Iron (II)-oxidation yields very little energy when Gallionella ferruginea
bacteria use Fe2+ as an energy source (only about 29 kJ mol-1). Their
growth is also inhibited by the rapid abiotic and aerobic oxidation of
Fe2+. This is a conundrum because the bacteria actually require oxygen
in order to grow! Assuming that they can scavenge Fe2+ efficiently, how
might these organisms thrive under such conditions?
They might use alternative electron acceptors, such as nitrate (NO3-).
They can secrete Fe3+
They may fix more CO2 using the Calvin-Benson cycle.
They may process/eat more Fe2+ in order to generate more energy
They might regenerate NAD+ more efficiently. - correct -answer-They
may process/eat more Fe2+ in order to generate more energy
The phase of microbial growth in which DNA repair occurs, nutrient
uptake and cell size increases, but yet in which the cells are not dividing
occurs is the ____________ phase.
Lag
Log/Exponential
Death/Decline
Stationary - correct -answer-Lag
