MCB 3023 Exam 3 Quizzes and All
Correct Answers 2025-2026 Updated.
Which of these is NOT an electron carrier used in the electron transport system? - Answer
ATPase
Which of these is the most widely used form of energy in cell processes? - Answer ATP
The most common lipids in the cell are synthesized from ______________ and
________________ - Answer fatty acids and glycerol
Which of these best describes assimilatory sulfate reduction? - Answer The reduction of
sulfate for incorporation into cellular material
Where is the reaction center of photosystems located? - Answer Within a biological
membrane.
How is ATP primarily produced in chemolithotrophs? - Answer Electrons moving through an
electron transport system to generate a proton motive force
Nitrogen fixation is the reduction of __________ to ammonia for cell use - Answer dinitrogen
gas
The standard reduction potential (E0') for ferredoxin (Fdox/Fdred) is (-0.43 V). Based on this,
which of these would you expect to be true? - Answer Reduced ferredoxin to be a good
electron donor
A chemical reaction that has a negative ΔG0' - Answer is a energy yielding reaction
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? - Answer Oxygen is being reduced in the reaction
How would the "dark reactions" of photosynthesis best be described? - Answer carbon dioxide
, Lactic acid is a common fermentation product. It is produced when _______________ is
reduced by electrons received from NADH - Answer pyruvate
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
Which of these is an example of a coenzyme? - Answer NAD+
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.
The products of the light reactions of photosynthesis are: - Answer ATP and NADPH
Which organisms contain bacteriochlorophyll? - Answer purple sulfur, purple non-sulfur, and
green sulfur bacteria
What is denitrification? - Answer The reduction of nitrate to dinitrogen.
How is the activity of an allosteric enzyme regulated? - Answer Through the binding of an
effector molecule.
The key carbon dioxide fixation reaction in the Calvin Cycle is carried out by which enzyme? -
Answer ribulose 1,5-bisphosphate carboxylase
What is the term for the primary pathway for fatty acid oxidation? - Answer B-oxidation
pathway
When does feedback inhibition of an enzyme occur? - Answer If an end product of the
pathway binds to the allosteric site of the enzyme
Correct Answers 2025-2026 Updated.
Which of these is NOT an electron carrier used in the electron transport system? - Answer
ATPase
Which of these is the most widely used form of energy in cell processes? - Answer ATP
The most common lipids in the cell are synthesized from ______________ and
________________ - Answer fatty acids and glycerol
Which of these best describes assimilatory sulfate reduction? - Answer The reduction of
sulfate for incorporation into cellular material
Where is the reaction center of photosystems located? - Answer Within a biological
membrane.
How is ATP primarily produced in chemolithotrophs? - Answer Electrons moving through an
electron transport system to generate a proton motive force
Nitrogen fixation is the reduction of __________ to ammonia for cell use - Answer dinitrogen
gas
The standard reduction potential (E0') for ferredoxin (Fdox/Fdred) is (-0.43 V). Based on this,
which of these would you expect to be true? - Answer Reduced ferredoxin to be a good
electron donor
A chemical reaction that has a negative ΔG0' - Answer is a energy yielding reaction
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? - Answer Oxygen is being reduced in the reaction
How would the "dark reactions" of photosynthesis best be described? - Answer carbon dioxide
, Lactic acid is a common fermentation product. It is produced when _______________ is
reduced by electrons received from NADH - Answer pyruvate
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
Which of these is an example of a coenzyme? - Answer NAD+
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.
The products of the light reactions of photosynthesis are: - Answer ATP and NADPH
Which organisms contain bacteriochlorophyll? - Answer purple sulfur, purple non-sulfur, and
green sulfur bacteria
What is denitrification? - Answer The reduction of nitrate to dinitrogen.
How is the activity of an allosteric enzyme regulated? - Answer Through the binding of an
effector molecule.
The key carbon dioxide fixation reaction in the Calvin Cycle is carried out by which enzyme? -
Answer ribulose 1,5-bisphosphate carboxylase
What is the term for the primary pathway for fatty acid oxidation? - Answer B-oxidation
pathway
When does feedback inhibition of an enzyme occur? - Answer If an end product of the
pathway binds to the allosteric site of the enzyme
