Question 1

The Q cycle refers to flow of electrons from

Accepted Answer

A)  NADH to coenzyme Q via Complex I. 
B)  FADH2 to coenzyme Q via Complex II. 
C)  coenzyme Q to cytochrome c via Complex III. 
D)  coenzyme Q to NADH. 
A)  NADH to coenzyme Q via Complex I. 
B)  FADH2 to coenzyme Q via Complex II. 
C)  coenzyme Q to cytochrome c via Complex III. 
D)  coenzyme Q to NADH. C

Question 2

What is the net yield of ATP per glucose molecule that passes through all of aerobic respiration (glucose CO2 + H2O)?

Accepted Answer

A)  2 
B)  4 
C)  6 
D)  30 - 32, dependent on the shuttle system used. 
A)  2 
B)  4 
C)  6 
D)  30 - 32, dependent on the shuttle system used. D

Question 3

The cytochrome that passes electrons directly to oxygen is

Accepted Answer

A)  the cytochrome a/a3 complex. 
B)  cytochrome b. 
C)  cytochrome c. 
D)  cytochrome c1. 
A)  the cytochrome a/a3 complex. 
B)  cytochrome b. 
C)  cytochrome c. 
D)  cytochrome c1. A

Question 4

Creatine supplements work best for long distance exercise,rather than for quick spurts of energy.

Accepted Answer

A) True 
 B)False

Question 5

Respiratory inhibitors in mitochondria do this:

Accepted Answer

A)  Stop electron flow but not stopping ATP synthesis. 
B)  Stop ATP synthesis but not stopping electron flow. 
C)  Block both electron flow and ATP synthesis. 
D)  Block the protons from moving through the membrane. 
E)  All of these describe what respiratory inhibitors do. 
A)  Stop electron flow but not stopping ATP synthesis. 
B)  Stop ATP synthesis but not stopping electron flow. 
C)  Block both electron flow and ATP synthesis. 
D)  Block the protons from moving through the membrane. 
E)  All of these describe what respiratory inhibitors do.

Question 6

When mitochondria are actively carrying out aerobic respiration

Accepted Answer

A)  the pH of the matrix is greater than the pH of the intermembrane space. 
B)  the pH of the matrix is less than the pH of the intermembrane space. 
C)  the pH of the matrix is about the same as the pH of the intermembrane space. 
D)  the pH of the matrix versus the intermembrane space has nothing to do with whether not aerobic respiration is occurring. 
A)  the pH of the matrix is greater than the pH of the intermembrane space. 
B)  the pH of the matrix is less than the pH of the intermembrane space. 
C)  the pH of the matrix is about the same as the pH of the intermembrane space. 
D)  the pH of the matrix versus the intermembrane space has nothing to do with whether not aerobic respiration is occurring.

Question 7

Which of the following components of the electron transport chain can only participate in one-electron transfers?

Accepted Answer

A)  NAD 
B)  FAD 
C)  coenzyme Q 
D)  cytochrome C 
A)  NAD 
B)  FAD 
C)  coenzyme Q 
D)  cytochrome C

Question 8

The reference reaction for determining reduction potentials (E° = 0) is the reduction of

Accepted Answer

A)  oxygen (O2) to water. 
B)  NAD+ to NADH. 
C)  H+ to H2 gas. 
D)  FAD to FADH2. 
A)  oxygen (O2) to water. 
B)  NAD+ to NADH. 
C)  H+ to H2 gas. 
D)  FAD to FADH2.

Question 9

The complex in the electron transport chain that does not have a direct link to coenzyme Q in some form is

Accepted Answer

A)  the succinate dehydrogenase complex. 
B)  Complex I. 
C)  cytochrome c oxidase. 
D)  Complex III. 
A)  the succinate dehydrogenase complex. 
B)  Complex I. 
C)  cytochrome c oxidase. 
D)  Complex III.

Question 10

Another name for Complex III in the mitochondria is

Accepted Answer

A)  Cytochrome C oxidase. 
B)  NADH-CoQ reductase. 
C)  succinate-CoQ reductase. 
D)  Cytochrome A oxidase. 
E)  Cytochrome bc1 complex. 
A)  Cytochrome C oxidase. 
B)  NADH-CoQ reductase. 
C)  succinate-CoQ reductase. 
D)  Cytochrome A oxidase. 
E)  Cytochrome bc1 complex.

Question 11

A species in the electron transport chain that can participate in a two-electron transfer is

Accepted Answer

A)  iron-sulfur proteins. 
B)  cytochrome b. 
C)  cytochrome c. 
D)  coenzyme Q. 
A)  iron-sulfur proteins. 
B)  cytochrome b. 
C)  cytochrome c. 
D)  coenzyme Q.

Question 12

Which of the following is not a part of the electron transport chain?

Accepted Answer

A)  NADH 
B)  FADH2 
C)  coenzyme Q 
D)  coenzyme A 
A)  NADH 
B)  FADH2 
C)  coenzyme Q 
D)  coenzyme A

Question 13

Which of the following are located in the inner mitochondrial membrane?

Accepted Answer

A)  all the components of the citric acid cycle and the electron transport chain 
B)  all the components of the citric acid cycle but none of the components of the electron transport chain 
C)  all the components of the electron transport chain but none of the components of the citric acid cycle 
D)  all the components of the electron transport chain and one of the components of the citric acid cycle, namely the succinate dehydrogenase complex 
A)  all the components of the citric acid cycle and the electron transport chain 
B)  all the components of the citric acid cycle but none of the components of the electron transport chain 
C)  all the components of the electron transport chain but none of the components of the citric acid cycle 
D)  all the components of the electron transport chain and one of the components of the citric acid cycle, namely the succinate dehydrogenase complex

Question 14

The yield of ATP from the complete oxidation of glucose is lower in muscle and brain from that in kidney,liver,and heart because

Accepted Answer

A)  there are fewer mitochondria in muscle and brain cells 
B)  muscle and brain cells have a lower requirement for ATP 
C)  different shuttle mechanisms operate to transfer electrons from the cytosol to the mitochondrion in the two sets of tissues 
D)  none of the above 
A)  there are fewer mitochondria in muscle and brain cells 
B)  muscle and brain cells have a lower requirement for ATP 
C)  different shuttle mechanisms operate to transfer electrons from the cytosol to the mitochondrion in the two sets of tissues 
D)  none of the above

Question 15

Transition metals are especially important in electron transport,since they have variable oxidation states.

Accepted Answer

A) True 
 B)False

Question 16

A cytochrome that can move freely in the mitochondrial membrane is

Accepted Answer

A)  cytochrome a 
B)  cytochrome b 
C)  cytochrome c 
D)  cytochrome c1 
A)  cytochrome a 
B)  cytochrome b 
C)  cytochrome c 
D)  cytochrome c1

Question 17

Complex III of the electron transport chain oxidizes ____,reduces ____,and ____ protons in the process.

Accepted Answer

A)  coenzyme Q; cytochrome c; pumps 
B)  coenzyme Q; cytochrome c; doesn't pump 
C)  cytochrome c; coenzyme Q; pumps 
D)  cytochrome c; coenzyme Q; doesn't pump 
A)  coenzyme Q; cytochrome c; pumps 
B)  coenzyme Q; cytochrome c; doesn't pump 
C)  cytochrome c; coenzyme Q; pumps 
D)  cytochrome c; coenzyme Q; doesn't pump

Question 18

What do cyanide,azide,and carbon monoxide all have in common?

Accepted Answer

A)  They are all products of combustion and contribute to smog 
B)  They all are nitrogenous compounds 
C)  They all inhibit the final step of electron transport 
D)  They all bond to hemoglobin irreversibly 
E)  All of these are common to the three compounds 
A)  They are all products of combustion and contribute to smog 
B)  They all are nitrogenous compounds 
C)  They all inhibit the final step of electron transport 
D)  They all bond to hemoglobin irreversibly 
E)  All of these are common to the three compounds

Question 19

Which complex of the electron transport chain does NOT contain an iron-sulfur cluster?

Accepted Answer

A)  Complex I 
B)  Complex II 
C)  Complex III 
D)  Complex IV 
A)  Complex I 
B)  Complex II 
C)  Complex III 
D)  Complex IV

Question 20

Oxidative phosphorylation is coupled to electron transport in

Accepted Answer

A)  Complexes I, II, and III 
B)  Complexes I, II, and IV 
C)  Complexes I, III, and IV 
D)  all four respiratory complexes 
A)  Complexes I, II, and III 
B)  Complexes I, II, and IV 
C)  Complexes I, III, and IV 
D)  all four respiratory complexes

Exam 20: Electron Transport and Oxidative Phosphorylation

The Q cycle refers to flow of electrons from

What is the net yield of ATP per glucose molecule that passes through all of aerobic respiration (glucose CO2 + H2O)?

The cytochrome that passes electrons directly to oxygen is

Creatine supplements work best for long distance exercise,rather than for quick spurts of energy.

Respiratory inhibitors in mitochondria do this:

When mitochondria are actively carrying out aerobic respiration

Which of the following components of the electron transport chain can only participate in one-electron transfers?

The reference reaction for determining reduction potentials (E° = 0) is the reduction of

The complex in the electron transport chain that does not have a direct link to coenzyme Q in some form is

Another name for Complex III in the mitochondria is

A species in the electron transport chain that can participate in a two-electron transfer is

Which of the following is not a part of the electron transport chain?

Which of the following are located in the inner mitochondrial membrane?

The yield of ATP from the complete oxidation of glucose is lower in muscle and brain from that in kidney,liver,and heart because

Transition metals are especially important in electron transport,since they have variable oxidation states.

A cytochrome that can move freely in the mitochondrial membrane is

Complex III of the electron transport chain oxidizes ____,reduces ____,and ____ protons in the process.

What do cyanide,azide,and carbon monoxide all have in common?

Which complex of the electron transport chain does NOT contain an iron-sulfur cluster?

Oxidative phosphorylation is coupled to electron transport in

Biochemistry and the Organization of Cells

Water: The Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three-Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins: Enzymes

The Behavior of Proteins: Enzymes, Mechanisms, and Control

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids: How Structure Conveys Information

Biosynthesis of Nucleic Acids: Replication

Transcription of the Genetic Code: Biosynthesis of Rna

Protein Synthesis: Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses, Cancer, and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism: Cellular Signaling

Filters

What is the net yield of ATP per glucose molecule that passes through all of aerobic respiration (glucose CO₂ + H₂O)?

Complex III of the electron transport chain oxidizes ,reduces ,and protons in the process.