Question 1

What is an amphibolic pathway? Provide an example.

Accepted Answer

An amphibolic pathway is a metabolic pat...

Question 2

Which of the following coenzymes function as an acetyl group carrier?

Accepted Answer

A)   Thiamine pyrophosphate
B)   Lipoic Acid
C)   NADH
D)   FADH2
E)   Coenzyme AF) A) and D)
G) A) and E)

Question 3

Determine the standard free energy for the following reaction
Cytochrome c (Fe+2) + 1/2O2 F1S1S1W1F1F1F10 cytochrome c (Fe+3) + H2O

Accepted Answer

Cyt c (Fe²⁺) + ¹/₂ O₂ → C...

Question 4

In a redox reaction, an electron acceptor is

Accepted Answer

A)   Oxidized as it accepts one or more electrons
B)   The reducing agent
C)   Converted to an electron donor with the gain of one or more electrons
D)   All of the above are correct
E)   None of the above are correctF) A) and D)
G) A) and C)

Question 5

The overall reaction catalyzed by pyruvate dehydrogenase is which of the following?

Accepted Answer

A)   CH3COCHO + NAD+ + CoASH  CH3CHOSCoA + NADH
B)   CH3COCOO- + FAD +CoASH  CH3CHSCoA + NADH
C)   CH3COCOO- + NAD+ + CoASH  CH3COSCoA + NADH
D)   CH3CH(OH) COO- + NADH + CoASH  CH3CH(OH) COSCoA + NAD+
E)   None of the above is correctF) B) and D)
G) C) and D)

Question 6

A runner needs a tremendous amount of energy during a race. Explain how the use of ATP by contracting muscle affects the citric acid cycle.

Accepted Answer

Contracting muscle converts large amount...

Question 7

The high-energy molecule produced in the conversion of succinyl-CoA to succinate is which of the following?

Accepted Answer

A)   ATP
B)   GTP
C)   AMP
D)   NADH
E)   Both A and B are correctF) A) and B)
G) C) and D)

Question 8

Outline the steps of the glyoxylate cycle.

Accepted Answer

The first two reactions of the glyoxylat...

Question 9

In the glyoxylate cycle two-carbon molecules are converted to precursors of which of the following?

Accepted Answer

A)   Acetyl-CoA
B)   Glucose
C)   Pyruvate
D)   Succinate
E)   Carbon dioxideF) A) and E)
G) A) and B)

Question 10

Describe in general terms how the appearance of molecular oxygen in Earth's atmosphere about 3 billion years ago affected the history of living organisms.

Accepted Answer

Ancient Earth possessed an atmosphere th...

Question 11

In order to determine the standard voltage of a reaction

Accepted Answer

A)   The individual reaction reduction potentials must be added
B)   The standard cells must be written as they occur in the reaction and the voltages are added.
C)   All the reactions must be written as oxidations and the voltages are added.
D)   The voltages of the individual reactions at pH = 7 must be calculated and the resultant voltages are added.
E)   A standard voltage for a reaction must be determined experimentally.F) All of the above
G) C) and D)

Question 12

Acetyl-CoA that is consumed by the citric acid cycle is produced from which of the following biochemical pathways?

Accepted Answer

A)   Glycolysis
B)   Fatty acid oxidation
C)   Purine catabolism
D)   Urea cycle
E)   Both A and B are correctF) B) and E)
G) B) and D)

Question 13

Oxygen is useful for energy generation because

Accepted Answer

A)   It is soluble in the cell membrane
B)   It is abundant
C)   It is a powerful reducing agent
D)   It is a powerful oxidizing agent
E)   A, B and DF) B) and C)
G) A) and D)

Question 14

How many oxidations steps are there in the citric acid cycle?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) All of the above
G) A) and B)

Question 15

What is an anaplerotic reaction? Give an example.

Accepted Answer

An anaplerotic reaction is a reaction th...

Question 16

Which of the following enzymes is unique to the glyoxylate cycle __________?

Accepted Answer

A)   Aconitase
B)   Malate dehydrogenase
C)   Fumarase
D)   Succinate dehydrogenase
E)   Isocitrate lyaseF) C) and E)
G) A) and E)

Question 17

You have just consumed a piece of fruit. Trace the carbon atoms in the glucose in the fruit through the biochemical pathways between their uptake into liver cells and their conversion to carbon dioxide.

Accepted Answer

After glucose has been absorbed from the...

Question 18

Acetyl-CoA is manufactured in the mitochondria and used in the cytoplasm to synthesize fatty acids. However acetyl-CoA cannot penetrate the mitochondrial membrane. How is this problem solved?

Accepted Answer

When present in excess citrate, produced...

Question 19

The enzyme, which links the two branches of the citric acid cycle, is which of the following

Accepted Answer

A)   -Ketoglutarate dehydrogenase
B)   Lactate dehydrogenase
C)   Malate dehydrogenase
D)   Fumatate reductase
E)   FumaraseF) A) and C)
G) B) and C)

Question 20

Which of the following reactions involves a substrate level phosphorylation?

Accepted Answer

A)   Pyruvate  Acetyl-CoA
B)   Succinyl-CoA  Succinate
C)   Citrate  Isocitrate
D)   Fumarate  Malate
E)   Malate  OxaloacetateF) B) and D)
G) A) and C)

Exam 9: Aerobic Metabolism I: The Citric Acid Cycle

Determine the standard free energy for the following reaction Cytochrome c (Fe+2) + 1/2O2  cytochrome c (Fe+3) + H2O

Correct AnswerverifiedCyt c (Fe2+) + 1/2 O2 → C...View AnswerShow Answer

Which of the following reactions involves a substrate level phosphorylation?

Correct AnswerverifiedShow Answer

Which of the following coenzymes function as an acetyl group carrier?

Correct AnswerverifiedShow Answer

Oxygen is useful for energy generation because

Correct AnswerverifiedShow Answer

The overall reaction catalyzed by pyruvate dehydrogenase is which of the following?

Correct AnswerverifiedShow Answer

What is an amphibolic pathway? Provide an example.

Correct AnswerverifiedAn amphibolic pathway is a metabolic pat...View AnswerShow Answer

In a redox reaction, an electron acceptor is

Correct AnswerverifiedShow Answer

You have just consumed a piece of fruit. Trace the carbon atoms in the glucose in the fruit through the biochemical pathways between their uptake into liver cells and their conversion to carbon dioxide.

Correct AnswerverifiedAfter glucose has been absorbed from the...View AnswerShow Answer

Describe in general terms how the appearance of molecular oxygen in Earth's atmosphere about 3 billion years ago affected the history of living organisms.

Correct AnswerverifiedAncient Earth possessed an atmosphere th...View AnswerShow Answer

What is an anaplerotic reaction? Give an example.

Correct AnswerverifiedAn anaplerotic reaction is a reaction th...View AnswerShow Answer

Acetyl-CoA is manufactured in the mitochondria and used in the cytoplasm to synthesize fatty acids. However acetyl-CoA cannot penetrate the mitochondrial membrane. How is this problem solved?

Correct AnswerverifiedWhen present in excess citrate, produced...View AnswerShow Answer

Which of the following enzymes is unique to the glyoxylate cycle __________?

Correct AnswerverifiedShow Answer

The enzyme, which links the two branches of the citric acid cycle, is which of the following

Correct AnswerverifiedShow Answer

Acetyl-CoA that is consumed by the citric acid cycle is produced from which of the following biochemical pathways?

Correct AnswerverifiedShow Answer

The high-energy molecule produced in the conversion of succinyl-CoA to succinate is which of the following?

Correct AnswerverifiedShow Answer

A runner needs a tremendous amount of energy during a race. Explain how the use of ATP by contracting muscle affects the citric acid cycle.

Correct AnswerverifiedContracting muscle converts large amount...View AnswerShow Answer

In order to determine the standard voltage of a reaction

Correct AnswerverifiedShow Answer

In the glyoxylate cycle two-carbon molecules are converted to precursors of which of the following?

Correct AnswerverifiedShow Answer

How many oxidations steps are there in the citric acid cycle?

Correct AnswerverifiedShow Answer

Outline the steps of the glyoxylate cycle.

Correct AnswerverifiedThe first two reactions of the glyoxylat...View AnswerShow Answer

Determine the standard free energy for the following reaction Cytochrome c (Fe⁺²) + 1/2O₂  cytochrome c (Fe⁺³) + H₂O

Correct Answer
verified
Cyt c (Fe²⁺) + ¹/₂ O₂ → C...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
An amphibolic pathway is a metabolic pat...
View Answer

Correct Answer
verified

Correct Answer
verified
After glucose has been absorbed from the...
View Answer

Correct Answer
verified
Ancient Earth possessed an atmosphere th...
View Answer

Correct Answer
verified
An anaplerotic reaction is a reaction th...
View Answer

Correct Answer
verified
When present in excess citrate, produced...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Contracting muscle converts large amount...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The first two reactions of the glyoxylat...
View Answer