Question 1

For each molecule of glucose that is metabolized by glycolysis and the citric acid cycle (see Figure 7.1) , what is the total number of NADH + FADH2 molecules produced?

Accepted Answer

A)   4
B)   5
C)   6
D)   10
E)   12F) A) and C)
G) A) and E)

Question 2

Approximately how many molecules of ATP are produced from the complete oxidation of two molecules of glucose (C6H12O6)  in aerobic cellular respiration?

Accepted Answer

A)   2
B)   4
C)   15
D)   30-32
E)   60-64F) B) and C)
G) D) and E)

Question 3

How does the addition of coenzyme A, a sulfur-containing molecule derived from a B vitamin, function in the subsequent reaction?

Accepted Answer

A)   It provides the sulfur needed for the molecule to enter the mitochondrion.
B)   It utilizes this portion of a B vitamin, which would otherwise be a waste product from another pathway.
C)   It provides a relatively unstable molecule whose acetyl portion can be readily transferred to a compound in the citric acid cycle.
D)   It drives the reaction that regenerates NAD+.
E)   It removes one molecule of CO2.F) B) and D)
G) A) and E)

Question 4

Which metabolic pathway is common to both cellular respiration and fermentation?

Accepted Answer

A)   the oxidation of pyruvate to acetyl CoA
B)   the citric acid cycle
C)   oxidative phosphorylation
D)   glycolysis
E)   chemiosmosisF) C) and E)
G) C) and D)

Question 5

In chemiosmosis, what is the most direct source of energy that is used to convert ADP + ℗i to ATP?

Accepted Answer

A)   energy released as electrons flow through the electron transport system
B)   energy released from substrate-level phosphorylation
C)   energy released from dehydration synthesis reactions
D)   energy released from movement of protons through ATP synthase, down their electrochemical gradient
E)   No external source of energy is required because the reaction is exergonic.F) A) and B)
G) A) and E)

Question 6

In mitochondria, exergonic redox reactions

Accepted Answer

A)   are the source of energy driving prokaryotic ATP synthesis.
B)   are directly coupled to substrate-level phosphorylation.
C)   provide the energy that establishes the proton gradient.
D)   reduce carbon atoms to carbon dioxide.
E)   use ATP to pump H+ out of the mitochondrion.F) None of the above
G) D) and E) C

Question 7

Why is glycolysis considered to be one of the first metabolic pathways to have evolved?

Accepted Answer

A)   It produces much less ATP than does oxidative phosphorylation.
B)   It does not involve organelles or specialized structures, does not require oxygen, and is present in most organisms.
C)   It is found in prokaryotic cells but not in eukaryotic cells.
D)   It relies on chemiosmosis, which is a metabolic mechanism present only in the first cells' prokaryotic cells.
E)   It requires the presence of membrane-enclosed cell organelles found only in eukaryotic cells.F) A) and C)
G) C) and E)

Question 8

Energy released by the electron transport chain is used to pump H+ into which location in eukaryotic cells?

Accepted Answer

A)   cytosol
B)   mitochondrial outer membrane
C)   mitochondrial inner membrane
D)   mitochondrial intermembrane space
E)   mitochondrial matrixF) A) and B)
G) A) and D)

Question 9

During aerobic respiration, electrons travel downhill in which sequence?

Accepted Answer

A)   food → citric acid cycle → ATP → NAD+
B)   food → NADH → electron transport chain → oxygen
C)   glucose → pyruvate → ATP → oxygen
D)   glucose → ATP → electron transport chain → NADH
E)   food → glycolysis → citric acid cycle → NADH → ATPF) A) and B)
G) None of the above

Question 10

How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?

Accepted Answer

A)   2
B)   4
C)   6
D)   8
E)   10F) D) and E)
G) C) and D)

Question 11

Which of the following occur(s)  in the cytosol of a eukaryotic cell?

Accepted Answer

A)   glycolysis and fermentation
B)   fermentation and chemiosmosis
C)   oxidation of pyruvate to acetyl CoA
D)   citric acid cycle
E)   oxidative phosphorylationF) C) and D)
G) B) and E)

Question 12

In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle. First, however, the pyruvate (1)  loses a carbon, which is given off as a molecule of CO2, (2)  is oxidized to form a two-carbon compound called acetate, and (3)  is bonded to coenzyme A.
-These three steps result in the formation of

Accepted Answer

A)   acetyl CoA, O2, and ATP.
B)   acetyl CoA, FADH2, and CO2.
C)   acetyl CoA, FAD, H2, and CO2.
D)   acetyl CoA, NADH, H+, and CO2.
E)   acetyl CoA, NAD+, ATP, and CO2.F) A) and B)
G) A) and C)

Question 13

Which of the following produces the most ATP when glucose (C6H12O6)  is completely oxidized to carbon dioxide (CO2)  and water?

Accepted Answer

A)   glycolysis
B)   fermentation
C)   oxidation of pyruvate to acetyl CoA
D)   citric acid cycle
E)   oxidative phosphorylation (chemiosmosis) F) A) and B)
G) B) and E)

Question 14

In prokaryotes, the respiratory electron transport chain is located

Accepted Answer

A)   in the mitochondrial inner membrane.
B)   in the mitochondrial outer membrane.
C)   in the plasma membrane.
D)   in the cytoplasm.
E)   in the bacterial outer membrane.F) C) and D)
G) A) and C)

Question 15

The primary role of oxygen in cellular respiration is to

Accepted Answer

A)   yield energy in the form of ATP as it is passed down the respiratory chain.
B)   act as an acceptor for electrons and hydrogen, forming water.
C)   combine with carbon, forming CO2.
D)   combine with lactate, forming pyruvate.
E)   catalyze the reactions of glycolysis.F) A) and B)
G) A) and E)

Question 16

The synthesis of ATP by oxidative phosphorylation, using the energy released by movement of protons across the membrane down their electrochemical gradient, is an example of

Accepted Answer

A)   active transport.
B)   an endergonic reaction coupled to an exergonic reaction.
C)   a reaction with a positive ΔG .
D)   osmosis.
E)   allosteric regulation.F) A) and E)
G) A) and D) B

Question 17

How many oxygen molecules (O2)  are required each time a molecule of glucose (C6H12O6)  is completely oxidized to carbon dioxide and water via aerobic respiration?

Accepted Answer

A)   1
B)   3
C)   6
D)   12
E)   30F) A) and D)
G) All of the above

Question 18

Chemiosmotic ATP synthesis (oxidative phosphorylation)  occurs in

Accepted Answer

A)   all cells, but only in the presence of oxygen.
B)   only eukaryotic cells, in the presence of oxygen.
C)   only in mitochondria, using either oxygen or other electron acceptors.
D)   all respiring cells, both prokaryotic and eukaryotic, using either oxygen or other electron acceptors.
E)   all cells, in the absence of respiration.F) B) and D)
G) A) and D) D

Question 19

If a cell is able to synthesize 30 ATP molecules for each molecule of glucose completely oxidized to carbon dioxide and water, approximately how many ATP molecules can the cell synthesize for each molecule of pyruvate oxidized to carbon dioxide and water?

Accepted Answer

A)   0
B)   1
C)   12
D)   14
E)   26F) A) and D)
G) B) and D)

Question 20

An organism is discovered that thrives both in the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism

Accepted Answer

A)   must use a molecule other than oxygen to accept electrons from the electron transport chain.
B)   is a normal eukaryotic organism.
C)   is photosynthetic.
D)   is an anaerobic organism.
E)   is a facultative anaerobe.F) None of the above
G) A) and B)

Exam 7: Cellular Respiration and Fermentation

For each molecule of glucose that is metabolized by glycolysis and the citric acid cycle (see Figure 7.1) , what is the total number of NADH + FADH2 molecules produced?

Correct Answer
verified

Approximately how many molecules of ATP are produced from the complete oxidation of two molecules of glucose (C6H12O6) in aerobic cellular respiration?

Correct Answer
verified

How does the addition of coenzyme A, a sulfur-containing molecule derived from a B vitamin, function in the subsequent reaction?

Correct Answer
verified

Which metabolic pathway is common to both cellular respiration and fermentation?

Correct Answer
verified

In chemiosmosis, what is the most direct source of energy that is used to convert ADP + ℗i to ATP?

Correct Answer
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In mitochondria, exergonic redox reactions

Correct Answer
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C

Why is glycolysis considered to be one of the first metabolic pathways to have evolved?

Correct Answer
verified

Energy released by the electron transport chain is used to pump H+ into which location in eukaryotic cells?

Correct Answer
verified

During aerobic respiration, electrons travel downhill in which sequence?

Correct Answer
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How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?

Correct Answer
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Which of the following occur(s) in the cytosol of a eukaryotic cell?

Correct Answer
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Correct Answer
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Which of the following produces the most ATP when glucose (C6H12O6) is completely oxidized to carbon dioxide (CO2) and water?

Correct Answer
verified

In prokaryotes, the respiratory electron transport chain is located

Correct Answer
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The primary role of oxygen in cellular respiration is to

Correct Answer
verified

The synthesis of ATP by oxidative phosphorylation, using the energy released by movement of protons across the membrane down their electrochemical gradient, is an example of

Correct Answer
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B

How many oxygen molecules (O2) are required each time a molecule of glucose (C6H12O6) is completely oxidized to carbon dioxide and water via aerobic respiration?

Correct Answer
verified

Chemiosmotic ATP synthesis (oxidative phosphorylation) occurs in

Correct Answer
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D

If a cell is able to synthesize 30 ATP molecules for each molecule of glucose completely oxidized to carbon dioxide and water, approximately how many ATP molecules can the cell synthesize for each molecule of pyruvate oxidized to carbon dioxide and water?

Correct Answer
verified

An organism is discovered that thrives both in the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism

Correct Answer
verified

Exam 7: Cellular Respiration and Fermentation

For each molecule of glucose that is metabolized by glycolysis and the citric acid cycle (see Figure 7.1) , what is the total number of NADH + FADH2 molecules produced?

Correct AnswerverifiedShow Answer

Approximately how many molecules of ATP are produced from the complete oxidation of two molecules of glucose (C6H12O6) in aerobic cellular respiration?

Correct AnswerverifiedShow Answer

How does the addition of coenzyme A, a sulfur-containing molecule derived from a B vitamin, function in the subsequent reaction?

Correct AnswerverifiedShow Answer

Which metabolic pathway is common to both cellular respiration and fermentation?

Correct AnswerverifiedShow Answer

In chemiosmosis, what is the most direct source of energy that is used to convert ADP + ℗i to ATP?

Correct AnswerverifiedShow Answer

In mitochondria, exergonic redox reactions

Correct AnswerverifiedC

Why is glycolysis considered to be one of the first metabolic pathways to have evolved?

Correct AnswerverifiedShow Answer

Energy released by the electron transport chain is used to pump H+ into which location in eukaryotic cells?

Correct AnswerverifiedShow Answer

During aerobic respiration, electrons travel downhill in which sequence?

Correct AnswerverifiedShow Answer

How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?

Correct AnswerverifiedShow Answer

Which of the following occur(s) in the cytosol of a eukaryotic cell?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following produces the most ATP when glucose (C6H12O6) is completely oxidized to carbon dioxide (CO2) and water?

Correct AnswerverifiedShow Answer

In prokaryotes, the respiratory electron transport chain is located

Correct AnswerverifiedShow Answer

The primary role of oxygen in cellular respiration is to

Correct AnswerverifiedShow Answer

The synthesis of ATP by oxidative phosphorylation, using the energy released by movement of protons across the membrane down their electrochemical gradient, is an example of

Correct AnswerverifiedB

How many oxygen molecules (O2) are required each time a molecule of glucose (C6H12O6) is completely oxidized to carbon dioxide and water via aerobic respiration?

Correct AnswerverifiedShow Answer

Chemiosmotic ATP synthesis (oxidative phosphorylation) occurs in

Correct AnswerverifiedD

If a cell is able to synthesize 30 ATP molecules for each molecule of glucose completely oxidized to carbon dioxide and water, approximately how many ATP molecules can the cell synthesize for each molecule of pyruvate oxidized to carbon dioxide and water?

Correct AnswerverifiedShow Answer

An organism is discovered that thrives both in the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism

Correct AnswerverifiedShow Answer

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C

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B

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D

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