Question 1

Which of the following molecules is responsible for carrying the acetyl group from pyruvate into the citric acid cycle?

Accepted Answer

A)  FADH2
B)  ATP
C)  CoA
D)  NADHE) C) and D)
F) B) and D)

Question 2

Which of the following processes actually produces a significant quantity of ATP?

Accepted Answer

A)  pyruvate oxidation
B)  glycolysis
C)  oxidative phosphorylation
D)  the citric acid cycleE) C) and D)
F) A) and C)

Question 3

In the process of aerobic metabolism, carbon-containing molecules are broken down. What is the energy from the electrons used for?

Accepted Answer

A)  to generate a hydrogen ion gradient
B)  to heat the organism in a cold environment
C)  to alter enzyme structure
D)  to directly supply the energy needs of an organismE) None of the above
F) C) and D)

Question 4

The electrons that are present in NADH and FADH2 are very high energy and theoretically sufficient to produce ATP alone. Why then have biological systems evolved a way that uses the various steps of cellular respiration to produce ATP?

Accepted Answer

A)  because steps in respiration allow for a controlled release of energy in small increments
B)  because all living organisms must use oxygen and therefore must carry out cellular respiration
C)  because it would be less efficient to produce ATP directly from NADH and FADH2
D)  because the amount of ADP is insufficient to phosphorylate and make ATPE) A) and B)
F) All of the above

Question 5

Refer to the above illustration of a mitochondrion. Match the labelled parts of the mitochondrion with the steps of cellular respiration. A labelled part may be used once, more than once, or not at all.
-pyruvate oxidation

Accepted Answer

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

Question 6

Which molecules are responsible for delivering the high-energy electrons from the citric acid cycle to the electron transfer system?

Accepted Answer

A)  Cyt C and Q
B)  NADH and Cyt C
C)  FADH2 and Q
D)  NADH and FADH2E) None of the above
F) A) and C)

Question 7

Molecular oxygen is breathed in and expired as carbon dioxide.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following directly powers the ATP synthase?

Accepted Answer

A)  carbohydrate metabolism
B)  NADH/FADH2
C)  the proton gradient
D)  electron transferE) All of the above
F) B) and C)

Question 9

What is the proton-motive force used for?

Accepted Answer

A)  diffusing substances across membranes and driving movement of flagella in bacteria
B)  pumping substances across membranes and driving movement of flagella in eukaryotes
C)  pumping substances across membranes and driving movement of flagella in bacteria
D)  diffusing substances across membranes and driving movement of flagella in eukaryotesE) A) and D)
F) B) and C)

Question 10

What is the fate of CoA after it delivers an acetyl group into the citric acid cycle?

Accepted Answer

A)  It is used in protein synthesis.
B)  It remains in an inactive form until the cell dies.
C)  It is degraded and used for energy.
D)  It is recharged with another acetate.E) A) and B)
F) A) and C)

Question 11

What are the functions of cytochrome c and ubiquinone?

Accepted Answer

A)  They shuttle electrons between the protein complexes.
B)  They synthesize water from molecular oxygen.
C)  They translocate protons from the matrix to the inner mitochondrial space.
D)  They produce ATP by substrate-level phosphorylation.E) None of the above
F) A) and B)

Question 12

During glycolysis, ATP is produced by oxidative phosphorylation.

Accepted Answer

A) True 
 B)False

Question 13

Glycolysis can take place in the absence of which of the following small molecules?

Accepted Answer

A)  FAD
B)  ATP
C)  NAD+
D)  ADPE) A) and B)
F) B) and D)

Question 14

For every glucose molecule that goes through cellular respiration, how many times is a carbon molecule fully oxidized to CO2 in the citric acid cycle?

Accepted Answer

A)  4 times
B)  3 times
C)  2 times
D)  1 timeE) A) and B)
F) A) and C)

Question 15

Refer to the above illustration of a mitochondrion. Match the labelled parts of the mitochondrion with the steps of cellular respiration. A labelled part may be used once, more than once, or not at all.
-ATP synthesis

Accepted Answer

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

Question 16

What is the final product of glycolysis?

Accepted Answer

A)  fructose
B)  glyceraldehyde-3-phosphate
C)  pyruvate
D)  glucoseE) None of the above
F) B) and D)

Question 17

Suppose that the pH of the matrix was significantly lower than the inner mitochondrial space. How would the ATP synthase function differently?

Accepted Answer

A)  It would misfold.
B)  It would no longer function properly.
C)  It would require an ion to stabilize it.
D)  It would hydrolyze ATP to form ADP.E) A) and D)
F) B) and C)

Question 18

If, during a chemical reaction, a molecule loses hydrogens, it could be described as being oxidized.

Accepted Answer

A) True 
 B)False

Question 19

What is the final product of glycolysis?

Accepted Answer

A)  1 molecule of pyruvate
B)  2 molecules of pyruvate
C)  1 molecule of glyceraldehyde-3-phosphate
D)  2 molecules of glyceraldehyde-3-phosphateE) All of the above
F) C) and D)

Question 20

Refer to the above illustration of a mitochondrion. Match the labelled parts of the mitochondrion with the steps of cellular respiration. A labelled part may be used once, more than once, or not at all.
-oxidative phosphorylation

Accepted Answer

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

Exam 6: Cellular Respiration

Which molecules are responsible for delivering the high-energy electrons from the citric acid cycle to the electron transfer system?

Correct AnswerverifiedShow Answer

Refer to the above illustration of a mitochondrion. Match the labelled parts of the mitochondrion with the steps of cellular respiration. A labelled part may be used once, more than once, or not at all. -ATP synthesis

Correct AnswerverifiedShow Answer

Suppose that the pH of the matrix was significantly lower than the inner mitochondrial space. How would the ATP synthase function differently?

Correct AnswerverifiedShow Answer

Molecular oxygen is breathed in and expired as carbon dioxide.

Correct AnswerverifiedShow Answer

If, during a chemical reaction, a molecule loses hydrogens, it could be described as being oxidized.

Correct AnswerverifiedShow Answer

What is the final product of glycolysis?

Correct AnswerverifiedShow Answer

Which of the following processes actually produces a significant quantity of ATP?

Correct AnswerverifiedShow Answer

Which of the following directly powers the ATP synthase?

Correct AnswerverifiedShow Answer

What are the functions of cytochrome c and ubiquinone?

Correct AnswerverifiedShow Answer

What is the fate of CoA after it delivers an acetyl group into the citric acid cycle?

Correct AnswerverifiedShow Answer

What is the proton-motive force used for?

Correct AnswerverifiedShow Answer

Refer to the above illustration of a mitochondrion. Match the labelled parts of the mitochondrion with the steps of cellular respiration. A labelled part may be used once, more than once, or not at all. -pyruvate oxidation

Correct AnswerverifiedShow Answer

For every glucose molecule that goes through cellular respiration, how many times is a carbon molecule fully oxidized to CO2 in the citric acid cycle?

Correct AnswerverifiedShow Answer

What is the final product of glycolysis?

Correct AnswerverifiedShow Answer

Refer to the above illustration of a mitochondrion. Match the labelled parts of the mitochondrion with the steps of cellular respiration. A labelled part may be used once, more than once, or not at all. -oxidative phosphorylation

Correct AnswerverifiedShow Answer

The electrons that are present in NADH and FADH2 are very high energy and theoretically sufficient to produce ATP alone. Why then have biological systems evolved a way that uses the various steps of cellular respiration to produce ATP?

Correct AnswerverifiedShow Answer

In the process of aerobic metabolism, carbon-containing molecules are broken down. What is the energy from the electrons used for?

Correct AnswerverifiedShow Answer

Glycolysis can take place in the absence of which of the following small molecules?

Correct AnswerverifiedShow Answer

During glycolysis, ATP is produced by oxidative phosphorylation.

Correct AnswerverifiedShow Answer

Which of the following molecules is responsible for carrying the acetyl group from pyruvate into the citric acid cycle?

Correct AnswerverifiedShow Answer

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For every glucose molecule that goes through cellular respiration, how many times is a carbon molecule fully oxidized to CO₂ in the citric acid cycle?

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The electrons that are present in NADH and FADH₂ are very high energy and theoretically sufficient to produce ATP alone. Why then have biological systems evolved a way that uses the various steps of cellular respiration to produce ATP?

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