Mcb3023: Exam 3- modules 3.1-3.4
Test Questions and All Correct
Answers 2026 Updated.
The biochemical reaction,
PEP + ADP -> Pyruvate +
ATP
is an example of which of these? - Answer Substrate-level phosphorylation.
Which of these is TRUE for a chemo organoheterotroph? - Answer Uses organic carbon as an
electron source and a carbon source.
How many NET molecules of ATP are produced during the Embden-Meyerhof pathway of
glycolysis for every molecule of glucose that is converted into two molecules of pyruvate? -
Answer two
Fermentation can most accurately be described by which of these? - Answer The direct
reoxidation of NADH by an internal organic molecule.
Which of these is NOT an electron carrier used in the electron transport system? - Answer
ATPase
How is ATP primarily produced in chemolithotrophs? - Answer Electrons moving through an
electron transport system to generate a proton motive force.
Term for the primary pathway for fatty acid oxidation? - Answer β-oxidation pathway
Cyanobacteria use _______ as an electron source for the reduction of NADP+. - Answer
water
How many ATP molecules is required to "fix" a molecule of nitrogen? - Answer sixteen
Which amino acids are the primary nitrogen donors for biosynthetic reactions in the cell? -
Answer glutamine and glutamate
Which of these best describes assimilatory sulfate reduction? - Answer The reduction of
sulfate for incorporation into cellular material.
, How do enzymes increase the rate of a biochemical reaction? - Answer By lowering the
activation energy.
How is the activity of an allosteric enzyme regulated? - Answer Through the binding of an
effector molecule.
Which of these is TRUE for a chemolithoautotroph? - Answer inorganic molecules as energy
sources and inorganic carbon as a carbon source.
The products of yeast fermentation, when including the Embden-Meyerhof pathway of
glycolysis for one molecule of glucose, are two ethano molecules as well as these others. -
Answer two ATP and two CO2
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.
Which of the following would NOT be appropriate as a terminal electron acceptor during
anaerobic respiration? - Answer hydrogen sulfide (H2S)
Enzymes that break down proteins into individual amino acids. - Answer proteases
How is ATP generated during the light-dependent reactions of photosynthesis? - Answer A
proton motive force driven ATP synthase.
Nitrogen fixation is the reduction of _______ to ammonia for cell use. - Answer dinitrogen
What is denitrification? - Answer The reduction of nitrate to dinitrogen.
Which of these is the most widely used form of
energy in cell processes? - Answer ATP
Which of these is an example of a coenzyme? - Answer NAD+
When oxygen reacts with hydrogen gas, water is produced as the product in this oxidation-
reduction reaction. Hydrogen donates electrons to oxygen in the reaction. Which statement
below is true about this reaction? - Answer Oxygen is being reduced in the reaction.
Test Questions and All Correct
Answers 2026 Updated.
The biochemical reaction,
PEP + ADP -> Pyruvate +
ATP
is an example of which of these? - Answer Substrate-level phosphorylation.
Which of these is TRUE for a chemo organoheterotroph? - Answer Uses organic carbon as an
electron source and a carbon source.
How many NET molecules of ATP are produced during the Embden-Meyerhof pathway of
glycolysis for every molecule of glucose that is converted into two molecules of pyruvate? -
Answer two
Fermentation can most accurately be described by which of these? - Answer The direct
reoxidation of NADH by an internal organic molecule.
Which of these is NOT an electron carrier used in the electron transport system? - Answer
ATPase
How is ATP primarily produced in chemolithotrophs? - Answer Electrons moving through an
electron transport system to generate a proton motive force.
Term for the primary pathway for fatty acid oxidation? - Answer β-oxidation pathway
Cyanobacteria use _______ as an electron source for the reduction of NADP+. - Answer
water
How many ATP molecules is required to "fix" a molecule of nitrogen? - Answer sixteen
Which amino acids are the primary nitrogen donors for biosynthetic reactions in the cell? -
Answer glutamine and glutamate
Which of these best describes assimilatory sulfate reduction? - Answer The reduction of
sulfate for incorporation into cellular material.
, How do enzymes increase the rate of a biochemical reaction? - Answer By lowering the
activation energy.
How is the activity of an allosteric enzyme regulated? - Answer Through the binding of an
effector molecule.
Which of these is TRUE for a chemolithoautotroph? - Answer inorganic molecules as energy
sources and inorganic carbon as a carbon source.
The products of yeast fermentation, when including the Embden-Meyerhof pathway of
glycolysis for one molecule of glucose, are two ethano molecules as well as these others. -
Answer two ATP and two CO2
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.
Which of the following would NOT be appropriate as a terminal electron acceptor during
anaerobic respiration? - Answer hydrogen sulfide (H2S)
Enzymes that break down proteins into individual amino acids. - Answer proteases
How is ATP generated during the light-dependent reactions of photosynthesis? - Answer A
proton motive force driven ATP synthase.
Nitrogen fixation is the reduction of _______ to ammonia for cell use. - Answer dinitrogen
What is denitrification? - Answer The reduction of nitrate to dinitrogen.
Which of these is the most widely used form of
energy in cell processes? - Answer ATP
Which of these is an example of a coenzyme? - Answer NAD+
When oxygen reacts with hydrogen gas, water is produced as the product in this oxidation-
reduction reaction. Hydrogen donates electrons to oxygen in the reaction. Which statement
below is true about this reaction? - Answer Oxygen is being reduced in the reaction.
