Mcb3023 Exam 3 And Exam 4 Test
Questions and All Correct Answers
2026 Updated.
Which organisms contain bacteriochlorophyll? - Answer purple sulfur, purple non-sulfur, and
green sulfur bacteria
The biochemical reaction, PEP + ADP → Pyruvate + ATP, is an example of which of these? -
Answer Substrate-level phosphorylation
Where is the reaction center of photosystems located? - Answer Within a biological
membrane.
What is denitrification? - Answer The reduction of nitrate to dinitrogen
What are the NET products of the Embden-Meyerhof pathway, when one molecule of glucose is
oxidized? - Answer Two pyruvate, two ATP, and two NADH
Which of these is TRUE for a chemoorganoheterotroph? - Answer Uses organic carbon as an
electron source and a carbon source
Which statement is TRUE with respect to the electron transport system? - Answer A proton
motive force is generated as electrons move through the system to a terminal acceptor
How would the "dark reactions" of photosynthesis best be described? - Answer carbon
dioxide fixing reactions
Thermotoga is - Answer an extremophile
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? - Answer photolithoautotroph
Some anoxygenic photosynthetic bacteria are able to use _______ as an electron source. -
Answer H2S
, Which of these is TRUE for a chemolithoautotroph? It uses: - Answer inorganic molecules as
energy sources and inorganic carbon as a carbon source.
Which of the following would NOT be appropriate as a terminal electron acceptor during
anaerobic respiration? - Answer hydrogen sulfide (H2S)
Lactic acid is a common fermentation product. It is produced when ___________ is reduced by
electrons received from NADH. - Answer pyruvate
A chemical reaction that has a negative ΔG0 - Answer is an energy yielding reaction
Which of these best describes assimilatory sulfate reduction? - Answer The reduction of
sulfate for incorporation into cellular material
Which amino acids are the primary nitrogen donors for biosynthetic reactions in the cell? -
Answer glutamine and glutamate
Cyanobacteria use _______ as an electron source for the reduction of NADP+. - Answer
water
How many ATP molecules is/are required to "fix" a molecule of nitrogen? - Answer sixteen
The most common lipids in the cell are synthesized from ___________ and ____________. -
Answer fatty acids and glycerol
What is the term for the primary pathway for fatty acid oxidation? - Answer β-oxidation
pathway
Microorganisms that rely solely on fermentation reactions for energy production make ATP
primarily by this method. - Answer substrate-level phosphorylation
How do enzymes increase the rate of a biochemical reaction? - Answer By lowering the
activation energy.
Nitrogen fixation is the reduction of _______ to ammonia for cell use. - Answer dinitrogen
gas
How is ATP primarily produced in chemolithotrophs? - Answer Electrons moving through an
electron transport system to generate a proton motive force.
Questions and All Correct Answers
2026 Updated.
Which organisms contain bacteriochlorophyll? - Answer purple sulfur, purple non-sulfur, and
green sulfur bacteria
The biochemical reaction, PEP + ADP → Pyruvate + ATP, is an example of which of these? -
Answer Substrate-level phosphorylation
Where is the reaction center of photosystems located? - Answer Within a biological
membrane.
What is denitrification? - Answer The reduction of nitrate to dinitrogen
What are the NET products of the Embden-Meyerhof pathway, when one molecule of glucose is
oxidized? - Answer Two pyruvate, two ATP, and two NADH
Which of these is TRUE for a chemoorganoheterotroph? - Answer Uses organic carbon as an
electron source and a carbon source
Which statement is TRUE with respect to the electron transport system? - Answer A proton
motive force is generated as electrons move through the system to a terminal acceptor
How would the "dark reactions" of photosynthesis best be described? - Answer carbon
dioxide fixing reactions
Thermotoga is - Answer an extremophile
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? - Answer photolithoautotroph
Some anoxygenic photosynthetic bacteria are able to use _______ as an electron source. -
Answer H2S
, Which of these is TRUE for a chemolithoautotroph? It uses: - Answer inorganic molecules as
energy sources and inorganic carbon as a carbon source.
Which of the following would NOT be appropriate as a terminal electron acceptor during
anaerobic respiration? - Answer hydrogen sulfide (H2S)
Lactic acid is a common fermentation product. It is produced when ___________ is reduced by
electrons received from NADH. - Answer pyruvate
A chemical reaction that has a negative ΔG0 - Answer is an energy yielding reaction
Which of these best describes assimilatory sulfate reduction? - Answer The reduction of
sulfate for incorporation into cellular material
Which amino acids are the primary nitrogen donors for biosynthetic reactions in the cell? -
Answer glutamine and glutamate
Cyanobacteria use _______ as an electron source for the reduction of NADP+. - Answer
water
How many ATP molecules is/are required to "fix" a molecule of nitrogen? - Answer sixteen
The most common lipids in the cell are synthesized from ___________ and ____________. -
Answer fatty acids and glycerol
What is the term for the primary pathway for fatty acid oxidation? - Answer β-oxidation
pathway
Microorganisms that rely solely on fermentation reactions for energy production make ATP
primarily by this method. - Answer substrate-level phosphorylation
How do enzymes increase the rate of a biochemical reaction? - Answer By lowering the
activation energy.
Nitrogen fixation is the reduction of _______ to ammonia for cell use. - Answer dinitrogen
gas
How is ATP primarily produced in chemolithotrophs? - Answer Electrons moving through an
electron transport system to generate a proton motive force.
