UNIT 3 AP BIO TEST QUESTIONS AND
ANSWERS
What does the chemiosmotic process in chloroplasts involve? - Correct Answers -A)
establishment of a proton gradient
In glycolysis, for each molecule of glucose oxidized to pyruvate - Correct Answers -B) 2
molecules of ATP are used and 4 molecules of ATP are produced.
In chemiosmotic phosphorylation, what is the most direct source of energy that is used
to convert ADP + Pi to ATP? - Correct Answers -D) energy released from movement of
protons through ATP synthase
Which statement describes the functioning of photosystem II? - Correct Answers -D)
The electron vacancies in P680 are filled by electrons derived from water.
The primary role of oxygen in cellular respiration is to - Correct Answers -B) act as an
acceptor for electrons and hydrogen, forming water.
During aerobic respiration, which of the following directly donates electrons to the
electron transport chain at the lowest energy level? - Correct Answers -E) FADH2
Which of the following is likely to lead to an increase in the concentration of ATP in a
cell? - Correct Answers -B) an increase in a cell's catabolic activity
What wavelength of light in the figure is most effective in driving photosynthesis? -
Correct Answers -A) 420 mm
Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for
photosynthesis. Why are they different? - Correct Answers -D) Other pigments absorb
light in addition to chlorophyll a.
The oxygen consumed during cellular respiration is involved directly in which process or
event? - Correct Answers -B) accepting electrons at the end of the electron transport
chain
In a plant cell, where are the ATP synthase complexes located? - Correct Answers -D)
A and C....thylakoid membrane & plasma membrane
, Where does the Calvin cycle take place? - Correct Answers -A) stroma of the
chloroplast
Photorespiration lowers the efficiency of photosynthesis by preventing the formation of -
Correct Answers -B) 3-phosphoglycerate molecules
Which metabolic pathway is common to both cellular respiration and fermentation? -
Correct Answers -D) glycolysis
Why are C4 plants able to photosynthesize with no apparent photorespiration? - Correct
Answers -B) They use PEP carboxylase to initially fix CO2 .
What are the products of linear photophosphorylation? - Correct Answers -C) ATP and
NADPH
The ATP made during glycolysis is generated by - Correct Answers -A) substrate-level
phosphorylation.
The molecule that functions as the reducing agent (electron donor) in a redox or
oxidation-reduction reaction - Correct Answers -B) loses electrons and loses energy.
Which of the following is an example of potential rather than kinetic energy? - Correct
Answers -D) a food molecule made up of energy-rich macromolecules
When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom
(not a hydrogen ion) the molecule becomes - Correct Answers -C) reduced.
What is proton-motive force? - Correct Answers -B) the transmembrane proton
concentration gradient
How many reduced dinucleotides would be produced with four turns of the citric acid
cycle? - Correct Answers -4 FADH2 and 12 NADH
Which of the following intermediary metabolites enters the citric acid cycle and is
formed, in part, by the
removal of a carbon (CO2 ) from one molecule of pyruvate? - Correct Answers -acetyl
CoA
In mitochondria, chemiosmosis translocates protons from the matrix into the
intermembrane space,
whereas in chloroplasts, chemiosmosis translocates protons from - Correct Answers -
the stroma to the thylakoid space
CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do
this because they - Correct Answers -fix CO2 into organic acids during the night.
ANSWERS
What does the chemiosmotic process in chloroplasts involve? - Correct Answers -A)
establishment of a proton gradient
In glycolysis, for each molecule of glucose oxidized to pyruvate - Correct Answers -B) 2
molecules of ATP are used and 4 molecules of ATP are produced.
In chemiosmotic phosphorylation, what is the most direct source of energy that is used
to convert ADP + Pi to ATP? - Correct Answers -D) energy released from movement of
protons through ATP synthase
Which statement describes the functioning of photosystem II? - Correct Answers -D)
The electron vacancies in P680 are filled by electrons derived from water.
The primary role of oxygen in cellular respiration is to - Correct Answers -B) act as an
acceptor for electrons and hydrogen, forming water.
During aerobic respiration, which of the following directly donates electrons to the
electron transport chain at the lowest energy level? - Correct Answers -E) FADH2
Which of the following is likely to lead to an increase in the concentration of ATP in a
cell? - Correct Answers -B) an increase in a cell's catabolic activity
What wavelength of light in the figure is most effective in driving photosynthesis? -
Correct Answers -A) 420 mm
Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for
photosynthesis. Why are they different? - Correct Answers -D) Other pigments absorb
light in addition to chlorophyll a.
The oxygen consumed during cellular respiration is involved directly in which process or
event? - Correct Answers -B) accepting electrons at the end of the electron transport
chain
In a plant cell, where are the ATP synthase complexes located? - Correct Answers -D)
A and C....thylakoid membrane & plasma membrane
, Where does the Calvin cycle take place? - Correct Answers -A) stroma of the
chloroplast
Photorespiration lowers the efficiency of photosynthesis by preventing the formation of -
Correct Answers -B) 3-phosphoglycerate molecules
Which metabolic pathway is common to both cellular respiration and fermentation? -
Correct Answers -D) glycolysis
Why are C4 plants able to photosynthesize with no apparent photorespiration? - Correct
Answers -B) They use PEP carboxylase to initially fix CO2 .
What are the products of linear photophosphorylation? - Correct Answers -C) ATP and
NADPH
The ATP made during glycolysis is generated by - Correct Answers -A) substrate-level
phosphorylation.
The molecule that functions as the reducing agent (electron donor) in a redox or
oxidation-reduction reaction - Correct Answers -B) loses electrons and loses energy.
Which of the following is an example of potential rather than kinetic energy? - Correct
Answers -D) a food molecule made up of energy-rich macromolecules
When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom
(not a hydrogen ion) the molecule becomes - Correct Answers -C) reduced.
What is proton-motive force? - Correct Answers -B) the transmembrane proton
concentration gradient
How many reduced dinucleotides would be produced with four turns of the citric acid
cycle? - Correct Answers -4 FADH2 and 12 NADH
Which of the following intermediary metabolites enters the citric acid cycle and is
formed, in part, by the
removal of a carbon (CO2 ) from one molecule of pyruvate? - Correct Answers -acetyl
CoA
In mitochondria, chemiosmosis translocates protons from the matrix into the
intermembrane space,
whereas in chloroplasts, chemiosmosis translocates protons from - Correct Answers -
the stroma to the thylakoid space
CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do
this because they - Correct Answers -fix CO2 into organic acids during the night.
