MCB 3023 Final Exam 3 Questions
with Guaranteed Pass Solutions 2025-
2026 Updated.
Some anoxygenic photosynthetic bacteria are able to use _______ as an electron source.
nitrate
Fe3+
H2O
H2S
CO2 - Answer H2S
Which of these is true for a chemo organoheterotroph?
Uses organic carbon as an electron source and a carbon source
Uses organic carbon as an electron source and inorganic carbon as a carbon source
Uses inorganic carbon as an energy source and a carbon source
Uses inorganic carbon as an energy source and organic carbon as a carbon source
Uses inorganic carbon as an electron source and organic carbon as a carbon source - Answer
Uses organic carbon as an electron source and a carbon source
Cyanobacteria carry out oxygenic photosynthesis producing oxygen as a byproduct from the
oxidation of water, which serves as the electron donor for the light-dependent reactions. How
would cyanobacteria be classified?
photoorganoautotroph
photolithoheterotroph
photolithoautotroph
chemoorganoautotroph
chemoorganoheterotroph - Answer photolithoautotroph
,fatty acids and glycerol
glycerol and hopanoids
hopanoids and sterols - Answer fatty acids and glycerol
Oxidative phosphorylation requires ALL of the following for energy production EXCEPT:
pyruvate synthase
membrane-associated electron transport chain
a proton motive force
electrons from NADH
an ATP synthase - Answer pyruvate synthase
Where is the reaction center of photosystems located?
Either in the cytoplasm or within a membrane
In the periplasmic space
In the cytoplasm
Within the cell wall
Within a biological membrane - Answer Within a biological membrane
Which of these best describes assimilatory sulfate reduction?
An energy yielding process
The reduction of sulfate to elemental sulfur
The reduction of sulfate for incorporation into cellular material
The reduction of sulfate to sulfide for excretion by the cell
A type of anaerobic respiration - Answer The reduction of sulfate for incorporation into
cellular material
What is the term for the primary pathway for fatty acid oxidation?
, reductive TCA pathway - Answer β-oxidation pathway
Microorganisms that rely solely on fermentation reactions for energy production make ATP
primarily by this method.
photo-oxidation of NADH
electron transport phosphorylation
membrane bound ATPase
substrate-level phosphorylation
oxidative phosphorylation - Answer substrate-level phosphorylation
How do enzymes increase the rate of a biochemical reaction?
By lowering the activation energy
By lowering the ΔG0'
By increasing the activation energy
By increasing the standard free energy
By lowering the reduction potential - Answer By lowering the activation energy
Which organisms contain bacteriochlorophyll?
cyanobacteria and plants
cyanobacteria and purple non-sulfur bacteria
cyanobacteria, purple sulfur bacteria, and green sulfur bacteria
purple sulfur, purple non-sulfur, and green sulfur bacteria
cyanobacteria and green sulfur bacteria - Answer purple sulfur, purple non-sulfur, and green
sulfur bacteria
When oxygen gas reacts with hydrogen gas water is produced as the product in this oxidation-
reduction reaction. Hydrogen donates electrons to elemental oxygen in the reaction. Which
statement below is true about this reaction?
with Guaranteed Pass Solutions 2025-
2026 Updated.
Some anoxygenic photosynthetic bacteria are able to use _______ as an electron source.
nitrate
Fe3+
H2O
H2S
CO2 - Answer H2S
Which of these is true for a chemo organoheterotroph?
Uses organic carbon as an electron source and a carbon source
Uses organic carbon as an electron source and inorganic carbon as a carbon source
Uses inorganic carbon as an energy source and a carbon source
Uses inorganic carbon as an energy source and organic carbon as a carbon source
Uses inorganic carbon as an electron source and organic carbon as a carbon source - Answer
Uses organic carbon as an electron source and a carbon source
Cyanobacteria carry out oxygenic photosynthesis producing oxygen as a byproduct from the
oxidation of water, which serves as the electron donor for the light-dependent reactions. How
would cyanobacteria be classified?
photoorganoautotroph
photolithoheterotroph
photolithoautotroph
chemoorganoautotroph
chemoorganoheterotroph - Answer photolithoautotroph
,fatty acids and glycerol
glycerol and hopanoids
hopanoids and sterols - Answer fatty acids and glycerol
Oxidative phosphorylation requires ALL of the following for energy production EXCEPT:
pyruvate synthase
membrane-associated electron transport chain
a proton motive force
electrons from NADH
an ATP synthase - Answer pyruvate synthase
Where is the reaction center of photosystems located?
Either in the cytoplasm or within a membrane
In the periplasmic space
In the cytoplasm
Within the cell wall
Within a biological membrane - Answer Within a biological membrane
Which of these best describes assimilatory sulfate reduction?
An energy yielding process
The reduction of sulfate to elemental sulfur
The reduction of sulfate for incorporation into cellular material
The reduction of sulfate to sulfide for excretion by the cell
A type of anaerobic respiration - Answer The reduction of sulfate for incorporation into
cellular material
What is the term for the primary pathway for fatty acid oxidation?
, reductive TCA pathway - Answer β-oxidation pathway
Microorganisms that rely solely on fermentation reactions for energy production make ATP
primarily by this method.
photo-oxidation of NADH
electron transport phosphorylation
membrane bound ATPase
substrate-level phosphorylation
oxidative phosphorylation - Answer substrate-level phosphorylation
How do enzymes increase the rate of a biochemical reaction?
By lowering the activation energy
By lowering the ΔG0'
By increasing the activation energy
By increasing the standard free energy
By lowering the reduction potential - Answer By lowering the activation energy
Which organisms contain bacteriochlorophyll?
cyanobacteria and plants
cyanobacteria and purple non-sulfur bacteria
cyanobacteria, purple sulfur bacteria, and green sulfur bacteria
purple sulfur, purple non-sulfur, and green sulfur bacteria
cyanobacteria and green sulfur bacteria - Answer purple sulfur, purple non-sulfur, and green
sulfur bacteria
When oxygen gas reacts with hydrogen gas water is produced as the product in this oxidation-
reduction reaction. Hydrogen donates electrons to elemental oxygen in the reaction. Which
statement below is true about this reaction?
