MCB 3023 EXAM 3 MODULES 3.1-3.4 QUESTIONS
WITH VERIFIED ANSWERS
The biochemical reaction,
PEP + ADP -> Pyruvate +
ATP
is an example of which of these? - Answers - Substrate-level phosphorylation.
Which of these is TRUE for a chemoorganoheterotroph? - Answers - 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? - Answers - two
Fermentation can most accurately be described by which of these? - Answers - The
direct reoxidation of NADH by an internal organic molecule.
Which of these is NOT an electron carrier used in the electron transport system? -
Answers - ATPase
How is ATP primarily produced in chemolithotrophs? - Answers - Electrons moving
through an electron transport system to generate a proton motive force.
Term for the primary pathway for fatty acid oxidation? - Answers - β-oxidation pathway
Cyanobacteria use _______ as an electron source for the reduction of NADP+. -
Answers - water
How many ATP molecules is required to "fix" a molecule of nitrogen? - Answers -
sixteen
Which amino acids are the primary nitrogen donors for biosynthetic reactions in the
cell? - Answers - glutamine and glutamate
Which of these best describes assimilatory sulfate reduction? - Answers - The reduction
of sulfate for incorporation into cellular material.
How do enzymes increase the rate of a biochemical reaction? - Answers - By lowering
the activation energy.
How is the activity of an allosteric enzyme regulated? - Answers - Through the binding
of an effector molecule.
, Which of these is TRUE for a chemolithoautotroph? - Answers - 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. - Answers - two ATP and two CO2
Which statement is TRUE with respect to the electron transport system? - Answers - 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? - Answers - hydrogen sulfide (H2S)
Enzymes that break down proteins into individual amino acids. - Answers - proteases
How is ATP generated during the light-dependent reactions of photosynthesis? -
Answers - A proton motive force driven ATP synthase.
Nitrogen fixation is the reduction of _______ to ammonia for cell use. - Answers -
dinitrogen
What is denitrification? - Answers - The reduction of nitrate to dinitrogen.
Which of these is the most widely used form of
energy in cell processes? - Answers - ATP
Which of these is an example of a coenzyme? - Answers - 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? - Answers - Oxygen is being
reduced in the reaction.
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? - Answers - photolithoautotroph
What are the NET products of the Embden-Meyerhof pathway, when operating in the
catabolic direction? - Answers - Two pyruvate, two ATP, and two NADH.
Microorganisms that rely solely on fermentation reactions for energy production make
ATP primarily by this method. - Answers - substrate-level phosphorylation
When does feedback inhibition of an enzyme occur? - Answers - an end product of the
pathway binds to the allosteric site of the enzyme.
WITH VERIFIED ANSWERS
The biochemical reaction,
PEP + ADP -> Pyruvate +
ATP
is an example of which of these? - Answers - Substrate-level phosphorylation.
Which of these is TRUE for a chemoorganoheterotroph? - Answers - 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? - Answers - two
Fermentation can most accurately be described by which of these? - Answers - The
direct reoxidation of NADH by an internal organic molecule.
Which of these is NOT an electron carrier used in the electron transport system? -
Answers - ATPase
How is ATP primarily produced in chemolithotrophs? - Answers - Electrons moving
through an electron transport system to generate a proton motive force.
Term for the primary pathway for fatty acid oxidation? - Answers - β-oxidation pathway
Cyanobacteria use _______ as an electron source for the reduction of NADP+. -
Answers - water
How many ATP molecules is required to "fix" a molecule of nitrogen? - Answers -
sixteen
Which amino acids are the primary nitrogen donors for biosynthetic reactions in the
cell? - Answers - glutamine and glutamate
Which of these best describes assimilatory sulfate reduction? - Answers - The reduction
of sulfate for incorporation into cellular material.
How do enzymes increase the rate of a biochemical reaction? - Answers - By lowering
the activation energy.
How is the activity of an allosteric enzyme regulated? - Answers - Through the binding
of an effector molecule.
, Which of these is TRUE for a chemolithoautotroph? - Answers - 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. - Answers - two ATP and two CO2
Which statement is TRUE with respect to the electron transport system? - Answers - 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? - Answers - hydrogen sulfide (H2S)
Enzymes that break down proteins into individual amino acids. - Answers - proteases
How is ATP generated during the light-dependent reactions of photosynthesis? -
Answers - A proton motive force driven ATP synthase.
Nitrogen fixation is the reduction of _______ to ammonia for cell use. - Answers -
dinitrogen
What is denitrification? - Answers - The reduction of nitrate to dinitrogen.
Which of these is the most widely used form of
energy in cell processes? - Answers - ATP
Which of these is an example of a coenzyme? - Answers - 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? - Answers - Oxygen is being
reduced in the reaction.
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? - Answers - photolithoautotroph
What are the NET products of the Embden-Meyerhof pathway, when operating in the
catabolic direction? - Answers - Two pyruvate, two ATP, and two NADH.
Microorganisms that rely solely on fermentation reactions for energy production make
ATP primarily by this method. - Answers - substrate-level phosphorylation
When does feedback inhibition of an enzyme occur? - Answers - an end product of the
pathway binds to the allosteric site of the enzyme.
