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UNIT 3 AP BIO TEST, AP BIO COLLEGE BOARD
UNIT 3 | COMPREHENSIVE QUESTIONS &
VERIFIED ANSWERS
What most likely causes the trends in oxygen concentration shown in the graph
above? (Oxygen concentration in the water of the lake graph) - correct-answer-
Photosynthesis produces more oxygen than is consumed by respiration during the
day
To test the hypothesis that a particular plant synthesizes storage lipids by using
glyceraldehyde 3-phosphate (G3P) from photosynthesis, a researcher plans to use
radiolabeled precursors to track the molecules through the biosynthetic pathway.
Which of the following radiolabeled precursors is most appropriate for the
researcher to use? - correct-answer-14C-labeled CO2, because atmospheric
carbon is fixed to carbohydrates by photosynthesis
In an experiment, a scientist isolates mitochondria from living cells and suspends
them in two different buffered solutions. One solution is maintained at pH 4, while
the other solution is maintained at pH 9. The scientist finds that mitochondria in
the solution at pH 4 continue to produce ATP but those in the pH 9 solution do
not.
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The results of the experiment can be used as evidence in support of which of the
following scientific claims about mitochondrial activity? - correct-answer-ATP
production in mitochondria requires a hydrogen ion gradient that favors
movement of protons into the mitochondrial matrix.
Additional observations were made on day 21, and no yellow-leaved seedlings
were found alive in either dish. This is most likely because - correct-answer-
yellow-leaved seedlings were unable to convert light energy to chemical energy.
According to the results of this experiment, germination of tobacco seeds during
the first week is - correct-answer-increased by exposure to light
According to the data, the mice at 10oC demonstrated greater oxygen
consumption per gram of tissue than did the mice at 25oC. This is most likely
explained by which of the following statements? - correct-answer-the mice at
10oC had a higher rate of ATP production than the mice at 25oC
During aerobic cellular respiration, oxygen gas is consumed at the same rate as
carbon dioxide gas is produced. In order to provide accurate volumetric
measurements of oxygen gas consumption, the experimental setup should include
which of the following? - correct-answer-A substance that removes carbon
dioxide gas
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Coenzyme that transfers electrons from the Krebs cycle to the mitochondrial
electron-transport chain at a lower energy level than that of electrons entering at
the beginning of the chain - correct-answer-FADH2
An intermediate electron acceptor for oxidations that occur in both glycolysis and
in Krebs cycle reactions - correct-answer-NAD+
The O2 released during photosynthesis comes from - correct-answer-H2O
The figures can best assist in answering which of the following questions? -
correct-answer-Do electron transport chains create a gradient so that ATP
synthase can generate ATP molecules?
A scientist claims that Elysia chlorotica, a species of sea slug, is capable of
photosynthesis.
Which of the following observations provides the best evidence to support the
claim? - correct-answer-Elysia chlorotica grows when exposed to light in the
absence of other food sources.
UNIT 3 AP BIO TEST, AP BIO COLLEGE BOARD
UNIT 3 | COMPREHENSIVE QUESTIONS &
VERIFIED ANSWERS
What most likely causes the trends in oxygen concentration shown in the graph
above? (Oxygen concentration in the water of the lake graph) - correct-answer-
Photosynthesis produces more oxygen than is consumed by respiration during the
day
To test the hypothesis that a particular plant synthesizes storage lipids by using
glyceraldehyde 3-phosphate (G3P) from photosynthesis, a researcher plans to use
radiolabeled precursors to track the molecules through the biosynthetic pathway.
Which of the following radiolabeled precursors is most appropriate for the
researcher to use? - correct-answer-14C-labeled CO2, because atmospheric
carbon is fixed to carbohydrates by photosynthesis
In an experiment, a scientist isolates mitochondria from living cells and suspends
them in two different buffered solutions. One solution is maintained at pH 4, while
the other solution is maintained at pH 9. The scientist finds that mitochondria in
the solution at pH 4 continue to produce ATP but those in the pH 9 solution do
not.
,2|Page
The results of the experiment can be used as evidence in support of which of the
following scientific claims about mitochondrial activity? - correct-answer-ATP
production in mitochondria requires a hydrogen ion gradient that favors
movement of protons into the mitochondrial matrix.
Additional observations were made on day 21, and no yellow-leaved seedlings
were found alive in either dish. This is most likely because - correct-answer-
yellow-leaved seedlings were unable to convert light energy to chemical energy.
According to the results of this experiment, germination of tobacco seeds during
the first week is - correct-answer-increased by exposure to light
According to the data, the mice at 10oC demonstrated greater oxygen
consumption per gram of tissue than did the mice at 25oC. This is most likely
explained by which of the following statements? - correct-answer-the mice at
10oC had a higher rate of ATP production than the mice at 25oC
During aerobic cellular respiration, oxygen gas is consumed at the same rate as
carbon dioxide gas is produced. In order to provide accurate volumetric
measurements of oxygen gas consumption, the experimental setup should include
which of the following? - correct-answer-A substance that removes carbon
dioxide gas
, 3|Page
Coenzyme that transfers electrons from the Krebs cycle to the mitochondrial
electron-transport chain at a lower energy level than that of electrons entering at
the beginning of the chain - correct-answer-FADH2
An intermediate electron acceptor for oxidations that occur in both glycolysis and
in Krebs cycle reactions - correct-answer-NAD+
The O2 released during photosynthesis comes from - correct-answer-H2O
The figures can best assist in answering which of the following questions? -
correct-answer-Do electron transport chains create a gradient so that ATP
synthase can generate ATP molecules?
A scientist claims that Elysia chlorotica, a species of sea slug, is capable of
photosynthesis.
Which of the following observations provides the best evidence to support the
claim? - correct-answer-Elysia chlorotica grows when exposed to light in the
absence of other food sources.
