MCB3023 EXAM 3 MODULES 3.1-3.4
WITH COMPLETE SOLUTIONS
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 chemoorganoheterotroph? - 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.
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
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.
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.
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
What are the NET products of the Embden-Meyerhof pathway, when operating in the
catabolic direction? - ANSWER-Two pyruvate, two ATP, and two NADH.
Microorganisms that rely solely on fermentation reactions for energy production
make ATP primarily by this method. - ANSWER-substrate-level phosphorylation
When does feedback inhibition of an enzyme occur? - ANSWER-an end product of
the pathway binds to the allosteric site of the enzyme.
What can the proton motive force generated by the electron transport system be
used for? - ANSWER-ATP synthesis, flagella rotation, and nutrient transport
The product(s) of the light reactions of photosynthesis. - ANSWER-ATP and NADPH
WITH COMPLETE SOLUTIONS
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 chemoorganoheterotroph? - 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.
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
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.
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.
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
What are the NET products of the Embden-Meyerhof pathway, when operating in the
catabolic direction? - ANSWER-Two pyruvate, two ATP, and two NADH.
Microorganisms that rely solely on fermentation reactions for energy production
make ATP primarily by this method. - ANSWER-substrate-level phosphorylation
When does feedback inhibition of an enzyme occur? - ANSWER-an end product of
the pathway binds to the allosteric site of the enzyme.
What can the proton motive force generated by the electron transport system be
used for? - ANSWER-ATP synthesis, flagella rotation, and nutrient transport
The product(s) of the light reactions of photosynthesis. - ANSWER-ATP and NADPH
