MCB3023 EXAM 3 QUESTIONS WITH
CORRECT ANSWERS
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
, 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.
What does a large positive ΔE0' indicate for a redox reaction? - ANSWER-It is
spontaneous
Cyanobacteria carry out oxygenic photosynthesis producing oxygen as a byproduct
from the ox-idation of water, which serves as the electron donor for the light-
dependent reactions. How would cyanobacteria be classified? - ANSWER-
photolithoautotroph
How many NET molecules of ATP are produced during the Embden-Meyerhof
pathway of gly-colysis 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.
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.
Enzymes that break down proteins into individual amino acids are called: -
ANSWER-proteases
CORRECT ANSWERS
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
, 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.
What does a large positive ΔE0' indicate for a redox reaction? - ANSWER-It is
spontaneous
Cyanobacteria carry out oxygenic photosynthesis producing oxygen as a byproduct
from the ox-idation of water, which serves as the electron donor for the light-
dependent reactions. How would cyanobacteria be classified? - ANSWER-
photolithoautotroph
How many NET molecules of ATP are produced during the Embden-Meyerhof
pathway of gly-colysis 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.
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.
Enzymes that break down proteins into individual amino acids are called: -
ANSWER-proteases
