Question 1

The ultimate electron acceptor from complex II is ________.

Accepted Answer

A) Q 
B) QH2 
C) cytochrome c 
D) O2 
E) FMN 
A) Q 
B) QH2 
C) cytochrome c 
D) O2 
E) FMN

Question 2

The numbers of mitochondria in cells is closely associated with cell function.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following substances can freely pass through the inner mitochondrial membrane?

Accepted Answer

A) H+ 
B) Acetate 
C) CO2 
D) ATP 
A) H+ 
B) Acetate 
C) CO2 
D) ATP

Question 4

The P/O ratio is independent of whether electrons originate from complex I or complex II.

Accepted Answer

A) True 
 B)False

Question 5

Superoxide dismutase protects cells from damage caused by ________.

Accepted Answer

A) ∙O²- 
B) O3²- 
C) H₂O₂ 
D) H₃O+ 
A) ∙O²- 
B) O3²- 
C) H₂O₂ 
D) H₃O+

Question 6

A muscle cell from an alligator jaw contains more mitochondria than a wing muscle of a migrating bird such as a goose.

Accepted Answer

A) True 
 B)False

Question 7

According to the binding change mechanism,the (alpha3 beta3 )oligomer of ATP synthase containing 3 catalytic sites can each have ________ different conformations.

Accepted Answer

A) 2 
B) 3 
C) 6 
D) 9 
A) 2 
B) 3 
C) 6 
D) 9

Question 8

Complex I contains a porin protein subunit that transports H+ across the inner mitochondrial membrane.

Accepted Answer

A) True 
 B)False

Question 9

Mitochondrial electron transport and ATP formation are interdependent.

Accepted Answer

A) True 
 B)False

Question 10

ATP directly provides the energy to transport protons across the inner membrane from the matrix to the intermembrane space of mitochondria.

Accepted Answer

A) True 
 B)False

Question 11

How many protons are translocated across the membrane by complex I for every pair of electrons that are passed from NADH to QH2?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 12

What is the Gibbs free energy change,△G,across a membrane with a pH difference of 0.50 and a membrane potential of -0.10 V at 310 K? (R = 8.315 J K-1 mol-1;F = 96,485 J V-1 mol-1)

Accepted Answer

A) -6.85 kJ mol-1 
B) -12.6 kJ mol-1 
C) 38.6 kJ mol-1 
D) 57.9 kJ mol-1 
A) -6.85 kJ mol-1 
B) -12.6 kJ mol-1 
C) 38.6 kJ mol-1 
D) 57.9 kJ mol-1

Question 13

The chemiosmotic theory is a concept that ________.

Accepted Answer

A) the transport of Na+ and K+ across cell membranes is by active transport 
B) explains how transport by facilitated diffusion reaches a saturation limit 
C) explains the blood-brain barrier 
D) a proton gradient drives the formation of ATP 
A) the transport of Na+ and K+ across cell membranes is by active transport 
B) explains how transport by facilitated diffusion reaches a saturation limit 
C) explains the blood-brain barrier 
D) a proton gradient drives the formation of ATP

Question 14

Membrane- associated electron transport complexes I and II are linked by ubiquinone (Q)while complexes II and IV are linked by cytochrome c.

Accepted Answer

A) True 
 B)False

Question 15

A lipid-soluble cofactor that can diffuse freely in the membrane of the electron transport chain and carry electrons across the membrane is ________.

Accepted Answer

A) ubiquinone (Q) 
B) Fe-S 
C) cytochrome c 
D)  FADH₂ 
A) ubiquinone (Q) 
B) Fe-S 
C) cytochrome c 
D)  FADH₂

Question 16

Which statement is not true about the transport of ATP across the inner mitochondrial membrane on its way to the cytosol?

Accepted Answer

A) It is accomplished by adenine nucleotide translocase. 
B) The same enzyme that transports ATP also transport ADP in the opposite direction. 
C) It is complexed with Mg2+ to reduce the draw on the electrical part of the protonmotive force. 
D) The transport causes the loss of a net charge of -1 in the matrix. 
A) It is accomplished by adenine nucleotide translocase. 
B) The same enzyme that transports ATP also transport ADP in the opposite direction. 
C) It is complexed with Mg2+ to reduce the draw on the electrical part of the protonmotive force. 
D) The transport causes the loss of a net charge of -1 in the matrix.

Question 17

The synthesis of one molecule of ATP from ADP requires ________ to be translocated across the inner mitochondrial membrane.

Accepted Answer

A) one proton 
B) three protons 
C) hundreds of protons 
D) 1 mole of protons 
A) one proton 
B) three protons 
C) hundreds of protons 
D) 1 mole of protons

Question 18

Iron sulfur clusters (Fs-S)that can accept or donate one electron are found in which complexes of the electron transport chain?

Accepted Answer

A) I 
B) II and III 
C) I,II and III 
D) I,II,III and IV 
A) I 
B) II and III 
C) I,II and III 
D) I,II,III and IV

Question 19

The human mitochondrial genome contains genes for all of the complexes necessary for electron transport and oxidative phosphorylation.

Accepted Answer

A) True 
 B)False

Question 20

Which is a component of complex I?

Accepted Answer

A) FAD 
B) FMN 
C) Q 
D) TPP 
A) FAD 
B) FMN 
C) Q 
D) TPP

Exam 14: Electron Transport and Atp Synthesis

The ultimate electron acceptor from complex II is ________.

The numbers of mitochondria in cells is closely associated with cell function.

Which of the following substances can freely pass through the inner mitochondrial membrane?

The P/O ratio is independent of whether electrons originate from complex I or complex II.

Superoxide dismutase protects cells from damage caused by ________.

A muscle cell from an alligator jaw contains more mitochondria than a wing muscle of a migrating bird such as a goose.

According to the binding change mechanism,the (alpha3 beta3 )oligomer of ATP synthase containing 3 catalytic sites can each have ________ different conformations.

Complex I contains a porin protein subunit that transports H+ across the inner mitochondrial membrane.

Mitochondrial electron transport and ATP formation are interdependent.

ATP directly provides the energy to transport protons across the inner membrane from the matrix to the intermembrane space of mitochondria.

How many protons are translocated across the membrane by complex I for every pair of electrons that are passed from NADH to QH2?

What is the Gibbs free energy change,△G,across a membrane with a pH difference of 0.50 and a membrane potential of -0.10 V at 310 K? (R = 8.315 J K-1 mol-1;F = 96,485 J V-1 mol-1)

The chemiosmotic theory is a concept that ________.

Membrane- associated electron transport complexes I and II are linked by ubiquinone (Q)while complexes II and IV are linked by cytochrome c.

A lipid-soluble cofactor that can diffuse freely in the membrane of the electron transport chain and carry electrons across the membrane is ________.

Which statement is not true about the transport of ATP across the inner mitochondrial membrane on its way to the cytosol?

The synthesis of one molecule of ATP from ADP requires ________ to be translocated across the inner mitochondrial membrane.

Iron sulfur clusters (Fs-S)that can accept or donate one electron are found in which complexes of the electron transport chain?

The human mitochondrial genome contains genes for all of the complexes necessary for electron transport and oxidative phosphorylation.

Which is a component of complex I?

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

Filters

How many protons are translocated across the membrane by complex I for every pair of electrons that are passed from NADH to QH₂?