UNIT 3 AP BIO TEST QUESTINONS WITH
CORRECT ANSWERS
Which of the following statements describes NAD+ - Answer-NAD+
is reduced to NADH during both glycolysis and the citric acid cycle.
When hydrogen ions are pumped from the mitochondrial matrix across the inner
membrane and into the
intermembrane space, the result is the - Answer-creation of a proton gradient.
Cellular respiration harvests the most chemical energy from which of the following? -
Answer-chemiosmotic phosphorylation
In the process of carbon fixation, RuBP attaches a CO2 to produce a 6 carbon
molecule, which is then - Answer-regeneration of rubisco
In the thylakoid membranes, what is the main role of the antenna pigment molecules? -
Answer-harvest photons and transfer light energy to the reaction-center chlorophyll
During cellular respiration, acetyl CoA accumulates in which location? - Answer-
mitochondrial matrix
Approximately how many molecules of ATP are produced from the complete oxidation
of two molecules
of glucose (C6H12O6 ) in cellular respiration? - Answer-76
P680+
is said to be the strongest biological oxidizing agent. Why? - Answer-This molecule
results from the transfer of an electron to the primary electron
acceptor of photosystem II and strongly attracts another electron
What is the primary function of the Calvin cycle? - Answer-synthesize simple sugars
from carbon dioxide
When oxygen is released as a result of photosynthesis, it is a by-product of which of the
following? - Answer-splitting the water molecules
Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no
longer separated
from the stroma. This damage will have the most direct effect on which of the following
processes? - Answer-the synthesis of ATP
How many reduced dinucleotides would be produced with four turns of the citric acid
cycle? - Answer-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? - Answer-acetyl CoA
In mitochondria, chemiosmosis translocates protons from the matrix into the
intermembrane space,
whereas in chloroplasts, chemiosmosis translocates protons from - Answer-the stroma
to the thylakoid space
Which of the events listed below occur in the light reactions of photosynthesis? -
Answer-light is absorbed and funneled to reaction-center chlorophyll a.
Where does glycolysis takes place? - Answer-cytosol
The molecule that functions as the reducing agent (electron donor) in a redox or
oxidation-reduction reaction - Answer-B) loses electrons and loses energy.
Which of the following is an example of potential rather than kinetic energy? - Answer-
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 - Answer-C) reduced.
What is proton-motive force? - Answer-B) the transmembrane proton concentration
gradient
CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do
this because they - Answer-fix CO2 into organic acids during the night.
A molecule that is phosphorylated - Answer-has an increased chemical reactivity; it is
primed to do cellular work
Which process in eukaryotic cells will proceed normally whether oxygen (O2) is present
or absent? - Answer-glycolysis
In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the
production of - Answer-ATP, CO2 , and ethanol (ethyl alcohol).
The ATP made during fermentation is generated by which of the following? - Answer-
substrate-level phosphorylation
As a research scientist, you measure the amount of ATP and NADPH consumed by the
Calvin cycle in 1
hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of
NADPH. Where did
CORRECT ANSWERS
Which of the following statements describes NAD+ - Answer-NAD+
is reduced to NADH during both glycolysis and the citric acid cycle.
When hydrogen ions are pumped from the mitochondrial matrix across the inner
membrane and into the
intermembrane space, the result is the - Answer-creation of a proton gradient.
Cellular respiration harvests the most chemical energy from which of the following? -
Answer-chemiosmotic phosphorylation
In the process of carbon fixation, RuBP attaches a CO2 to produce a 6 carbon
molecule, which is then - Answer-regeneration of rubisco
In the thylakoid membranes, what is the main role of the antenna pigment molecules? -
Answer-harvest photons and transfer light energy to the reaction-center chlorophyll
During cellular respiration, acetyl CoA accumulates in which location? - Answer-
mitochondrial matrix
Approximately how many molecules of ATP are produced from the complete oxidation
of two molecules
of glucose (C6H12O6 ) in cellular respiration? - Answer-76
P680+
is said to be the strongest biological oxidizing agent. Why? - Answer-This molecule
results from the transfer of an electron to the primary electron
acceptor of photosystem II and strongly attracts another electron
What is the primary function of the Calvin cycle? - Answer-synthesize simple sugars
from carbon dioxide
When oxygen is released as a result of photosynthesis, it is a by-product of which of the
following? - Answer-splitting the water molecules
Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no
longer separated
from the stroma. This damage will have the most direct effect on which of the following
processes? - Answer-the synthesis of ATP
How many reduced dinucleotides would be produced with four turns of the citric acid
cycle? - Answer-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? - Answer-acetyl CoA
In mitochondria, chemiosmosis translocates protons from the matrix into the
intermembrane space,
whereas in chloroplasts, chemiosmosis translocates protons from - Answer-the stroma
to the thylakoid space
Which of the events listed below occur in the light reactions of photosynthesis? -
Answer-light is absorbed and funneled to reaction-center chlorophyll a.
Where does glycolysis takes place? - Answer-cytosol
The molecule that functions as the reducing agent (electron donor) in a redox or
oxidation-reduction reaction - Answer-B) loses electrons and loses energy.
Which of the following is an example of potential rather than kinetic energy? - Answer-
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 - Answer-C) reduced.
What is proton-motive force? - Answer-B) the transmembrane proton concentration
gradient
CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do
this because they - Answer-fix CO2 into organic acids during the night.
A molecule that is phosphorylated - Answer-has an increased chemical reactivity; it is
primed to do cellular work
Which process in eukaryotic cells will proceed normally whether oxygen (O2) is present
or absent? - Answer-glycolysis
In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the
production of - Answer-ATP, CO2 , and ethanol (ethyl alcohol).
The ATP made during fermentation is generated by which of the following? - Answer-
substrate-level phosphorylation
As a research scientist, you measure the amount of ATP and NADPH consumed by the
Calvin cycle in 1
hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of
NADPH. Where did
