Download Practice Test - IHS AP Biology

Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Use the following figure and the stages labeled A, B, C, D, and E to answer the following questions.
Figure 10.2
1) If ATP used by this plant is labeled with radioactive phosphorus, in which molecules will the
radioactivity be measurable after one "turn" of the cycle?
A) in B and E only
B) in B, C, D, and E
C) in B and C only
D) in B only
E) in B, C, and D only
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1)
2) If the carbon atom of the incoming CO2 molecule is labeled with a radioactive isotope of carbon,
2)
where will the radioactivity be measurable after one cycle?
A) in C only
B) in B and C
C) in A, B, and C
D) in E only
E) in C, D, and E
3) Which molecule(s) of the Calvin cycle is/are most like molecules found in glycolysis?
A) B, C, and E
B) E only
C) C and D only
D) A only
E) A, B, C, and E
3)
4) What is the reducing agent in the following reaction?
Pyruvate + NADH + H+ → Lactate + NAD +
4)
A) NAD+
B) oxygen
C) NADH
D) pyruvate
E) lactate
5) The immediate energy source that drives ATP synthesis by ATP synthase during oxidative
phosphorylation is
A) the flow of electrons down the electron transport chain.
B) the oxidation of glucose and other organic compounds.
C) the H+ concentration gradient across the inner mitochondrial membrane.
D) the affinity of oxygen for electrons.
E) the transfer of phosphate to ADP.
5)
6) Which metabolic pathway is common to both fermentation and cellular respiration of a glucose
molecule?
A) the electron transport chain
B) synthesis of acetyl CoA from pyruvate
C) the citric acid cycle
D) reduction of pyruvate to lactate
E) glycolysis
6)
7) In mitochondria, exergonic redox reactions
A) provide the energy that establishes the proton gradient.
B) reduce carbon atoms to carbon dioxide.
C) are directly coupled to substrate-level phosphorylation.
D) are the source of energy driving prokaryotic ATP synthesis.
E) are coupled via phosphorylated intermediates to endergonic processes.
7)
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8) The final electron acceptor of the electron transport chain that functions in aerobic oxidative
phosphorylation is
A) pyruvate.
B) oxygen.
C) ADP.
D) water.
E) NAD+.
8)
9) When electrons flow along the electron transport chains of mitochondria, which of the following
changes occurs?
A) ATP synthase pumps protons by active transport.
B) NAD+ is oxidized.
C) The cytochromes phosphorylate ADP to form ATP.
D) The electrons gain free energy.
E) The pH of the matrix increases.
9)
10) Cells do not catabolize carbon dioxide because
A) CO2 has fewer bonding electrons than other organic compounds.
10)
B) CO2 is already completely reduced.
C) its double bonds are too stable to be broken.
D) CO2 is already completely oxidized.
E) the molecule has too few atoms.
11) Which of the following is a true distinction between fermentation and cellular respiration?
A) Substrate-level phosphorylation is unique to fermentation.
B) Only respiration oxidizes glucose.
C) NADH is oxidized by the electron transport chain in respiration only.
D) Fermentation, but not respiration, is an example of a catabolic pathway.
E) NAD+ functions as an oxidizing agent only in respiration.
11)
12) Most CO2 from catabolism is released during
12)
A) oxidative phosphorylation.
B) the citric acid cycle.
C) lactate fermentation.
D) electron transport.
E) glycolysis.
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ESSAY. Write your answer in the space provided or on a separate sheet of paper.
13) The graph here shows the pH difference across the inner mitochondrial membrane over time in an actively
respiring cell. At the time indicated by the vertical arrow, a metabolic poison is added that specifically and
completely inhibits all function of mitochondrial ATP synthase. Draw what you would expect to see for the
rest of the graphed line.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
14) The light reactions of photosynthesis supply the Calvin cycle with
A) sugar and O 2.
14)
B) H2O and NADPH.
C) ATP and NADPH.
D) CO2 and ATP.
E) light energy.
15) Starting with one molecule of glucose, the "net" products of glycolysis are
A) 2 NADH, 2 H+, 2 pyruvate, 2 ATP, and 2 H2O.
B) 2 FADH2, 2 pyruvate, 4 ATP, and 2 H2O.
C) 6 CO 2, 6 H2O, 36 ATP, and 2 citrate.
D) 6 CO 2, 6 H2O, 2 ATP, and 2 pyruvate.
E) 2 NAD +, 2 H+, 2 pyruvate, 2 ATP, and 2 H2O.
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15)
Figure 9.3
16) The accompanying figure shows the electron transport chain. Which of the following is the
combination of substances that is initially added to the chain?
A) oxygen, carbon dioxide, and water
B) NADH, FADH2, and electrons
16)
C) NADH, FADH2, and protons
D) NAD+ , FAD, and electrons
E) Oxygen and electrons
17) Which of the following most accurately describes what is happening along this chain?
A) Each electron carrier alternates between being reduced and being oxidized.
B) Molecules in the chain give up some of their potential energy.
C) Energy of the electrons increases at each step.
D) ATP is generated at each step.
E) Chemiosmosis is coupled with electron transfer.
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17)
18) Which of the following occurs in the cytosol of a eukaryotic cell?
A) glycolysis and fermentation
B) oxidation of pyruvate to acetyl CoA
C) oxidative phosphorylation
D) fermentation and chemiosmosis
E) citric acid cycle
18)
19) An organism is discovered that consumes a considerable amount of sugar, yet does not gain
much weight when denied air. Curiously, the consumption of sugar increases as air is removed
from the organism's environment, but the organism seems to thrive even in the absence of air.
When returned to normal air, the organism does fine. Which of the following best describes the
organism?
A) It is an anaerobic organism.
B) It must use a molecule other than oxygen to accept electrons from the electron transport
chain.
C) It is a facultative anaerobe.
D) It is a normal eukaryotic organism.
E) The organism obviously lacks the citric acid cycle and electron transport chain.
19)
20) Which of the following sequences correctly represents the flow of electrons during
photosynthesis?
A) NADPH → chlorophyll → Calvin cycle
B) NADPH → electron transport chain → O 2
20)
C) H2O → NADPH → Calvin cycle
D) NADPH → O 2 → CO 2
E) H2O → photosystem I → photosystem II
21) In mechanism, photophosphorylation is most similar to
A) carbon fixation.
B) reduction of NADP+.
C) substrate-level phosphorylation in glycolysis.
D) oxidative phosphorylation in cellular respiration.
E) the Calvin cycle.
21)
22) How is photosynthesis similar in C4 and CAM plants?
22)
A) In both cases, only photosystem I is used.
B) Both types of plants make most of their sugar in the dark.
C) In both cases, rubisco is not used to fix carbon initially.
D) In both cases, thylakoids are not involved in photosynthesis.
E) Both types of plants make sugar without the Calvin cycle.
23) Which process is most directly driven by light energy?
A) carbon fixation in the stroma
B) reduction of NADP+ molecules
C) ATP synthesis
D) removal of electrons from chlorophyll molecules
E) creation of a pH gradient by pumping protons across the thylakoid membrane
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23)
24) Which of the following statements is a correct distinction between autotrophs and heterotrophs?
A) Only heterotrophs have mitochondria.
B) Autotrophs, but not heterotrophs, can nourish themselves beginning with CO 2 and other
24)
nutrients that are inorganic.
C) Cellular respiration is unique to heterotrophs.
D) Only heterotrophs require chemical compounds from the environment.
E) Only heterotrophs require oxygen.
25) Which of the following does not occur during the Calvin cycle?
A) oxidation of NADPH
B) consumption of ATP
C) carbon fixation
D) release of oxygen
E) regeneration of the CO2 acceptor
25)
Refer to Figure 9.2, showing the citric acid cycle, as a guide to answer the following questions.
Figure 9.2
26) Starting with one molecule of isocitrate and ending with fumarate, what is the maximum
number of ATP molecules that could be made through substrate-level phosphorylation?
A) 12
B) 1
C) 24
D) 2
E) 11
26)
27) How many molecules of carbon dioxide (CO 2) would be produced by five turns of the citric acid
27)
cycle?
A) 5
B) 12
C) 2
D) 60
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E) 10
28) How many reduced dinucleotides would be produced with four turns of the citric acid cycle?
A) 1 FADH2 and 4 NADH
B) 4 FAD+ and 12 NAD +
28)
C) 4 FADH2 and 12 NADH
D) 1 FAD and 4 NAD+
E) 2 FADH2 and 8 NADH
29) Starting with citrate, which of the following combinations of products would result from three
turns of the citric acid cycle?
A) 2 ATP, 2 CO2, 1 NADH, and 3 FADH2
29)
B) 3 ATP, 3 CO2, 3 NADH, and 3 FADH2
C) 3 ATP, 6 CO2, 9 NADH, and 3 FADH2
D) 1 ATP, 2 CO2, 3 NADH, and 1 FADH2
E) 38 ATP, 6 CO2, 3 NADH, and 12 FADH2
30) Carbon dioxide (CO 2) is released during which of the following stages of cellular respiration?
A) fermentation and glycolysis
B) the citric acid cycle and oxidative phosphorylation
C) oxidation of pyruvate to acetyl CoA and the citric acid cycle
D) oxidative phosphorylation and fermentation
E) glycolysis and the oxidation of pyruvate to acetyl CoA
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30)
Answer Key
Testname: CELL ENERGY PRACTICE TEST
1) B
2) D
3) C
4) C
5) C
6) E
7) A
8) B
9) E
10) D
11) C
12) B
13)
14) C
15) A
16) B
17) A
18) A
19) C
20) C
21) D
22) C
23) D
24) B
25) D
26) B
27) E
28) C
29) C
30) C
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