Question 1

In bacteria,oxidative phosphorylation occurs in the mitochondrial membrane.

Accepted Answer

A) True 
 B)False

Question 2

The chemiosmotic theory explains that the energy for driving ATP formation in mitochondria comes from a proton concentration gradient.

Accepted Answer

A) True 
 B)False

Question 3

The number of mitochondria per cell is relatively constant among cell types and species.

Accepted Answer

A) True 
 B)False

Question 4

Which statement is false about complex IV?

Accepted Answer

A) A binuclear center that contains an iron ion and heme-a3 is the site of the reduction of molecular oxygen to water. 
B) Bacterial and eukaryotic forms of complex IV have very similar structures and number of subunits per functional unit. 
C) The core structure of the cytochrome c oxidase in complex IV has three conserved subunits. 
D) Copper ions shift from a +2 oxidation state to a +1 oxidation state as electrons are passed through the complex. 
A) A binuclear center that contains an iron ion and heme-a3 is the site of the reduction of molecular oxygen to water. 
B) Bacterial and eukaryotic forms of complex IV have very similar structures and number of subunits per functional unit. 
C) The core structure of the cytochrome c oxidase in complex IV has three conserved subunits. 
D) Copper ions shift from a +2 oxidation state to a +1 oxidation state as electrons are passed through the complex.

Question 5

To reduce one molecule of O2,________ electron(s)must be passed through the electron transport chain and ________ molecule(s)of NADH is(are)oxidized.

Accepted Answer

A) 4;2 
B) 2;1 
C) 1;1 
D) 1;2 
E) 4;4 
A) 4;2 
B) 2;1 
C) 1;1 
D) 1;2 
E) 4;4

Question 6

Which best describe the structure of complex II?

Accepted Answer

A) An L-shaped structure that spans the membrane and partially extends into the mitochondrial matrix. 
B) A structure firmly anchored to the membrane by many α-helices that span the lipid-bilayer. 
C) Three identical multisubunit enzymes that associate to form a mushroom-shaped structure. 
D) Has a core structure of three conserved subunits,one of which forms a β-barrel on the exterior surface of the membrane. 
A) An L-shaped structure that spans the membrane and partially extends into the mitochondrial matrix. 
B) A structure firmly anchored to the membrane by many α-helices that span the lipid-bilayer. 
C) Three identical multisubunit enzymes that associate to form a mushroom-shaped structure. 
D) Has a core structure of three conserved subunits,one of which forms a β-barrel on the exterior surface of the membrane.

Question 7

Most of the free energy needed to drive ATP formation in the mitochondria is the result of an electrical contribution from a charge gradient across the inner mitochondrial membrane.

Accepted Answer

A) True 
 B)False

Question 8

NADH and QH2 for oxidative phosphorylation are produced only through the citric acid cycle under aerobic conditions.

Accepted Answer

A) True 
 B)False

Question 9

How many protons are translocated across the inner mitochondrial membrane by complex III for each pair of electrons passing through the electron transport chain?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 4 
A) 0 
B) 1 
C) 2 
D) 4

Question 10

In mammals the enzyme complexes of oxidative phosphorylation are in the inner mitochondrial membrane.

Accepted Answer

A) True 
 B)False

Question 11

The P/O ratio for passing electrons through complexes I,III and IV is ________.

Accepted Answer

A) 1 
B) 1.5 
C) 2 
D) 2.5 
E) 3 
A) 1 
B) 1.5 
C) 2 
D) 2.5 
E) 3

Question 12

The oxidizing agent in the enzyme superoxide dismutase is

Accepted Answer

A) superoxide anion (∙O2-). 
B) H₂O2. 
C) Copper. 
D) O2. 
E) All of the above. 
A) superoxide anion (∙O2-). 
B) H₂O2. 
C) Copper. 
D) O2. 
E) All of the above.

Question 13

Which complex in the electron transport chain does not contribute to the proton gradient?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 14

Both fumarate reductase and succinate dehydrogenase can function at the same time in E.coli.

Accepted Answer

A) True 
 B)False

Question 15

What is the role of FMN in complex I?

Accepted Answer

A) Converts a two-electron transfer to a one-electron transfer. 
B) Converts a one-electron transfer to a two-electron transfer. 
C) Transports four H+ across the membrane. 
D) None,there is no FMN in complex I. 
A) Converts a two-electron transfer to a one-electron transfer. 
B) Converts a one-electron transfer to a two-electron transfer. 
C) Transports four H+ across the membrane. 
D) None,there is no FMN in complex I.

In bacteria,oxidative phosphorylation occurs in the mitochondrial membrane.

The chemiosmotic theory explains that the energy for driving ATP formation in mitochondria comes from a proton concentration gradient.

The number of mitochondria per cell is relatively constant among cell types and species.

Which statement is false about complex IV?

To reduce one molecule of O₂, electron(s)must be passed through the electron transport chain and molecule(s)of NADH is(are)oxidized.

Which best describe the structure of complex II?

Most of the free energy needed to drive ATP formation in the mitochondria is the result of an electrical contribution from a charge gradient across the inner mitochondrial membrane.

NADH and QH₂ for oxidative phosphorylation are produced only through the citric acid cycle under aerobic conditions.

How many protons are translocated across the inner mitochondrial membrane by complex III for each pair of electrons passing through the electron transport chain?

In mammals the enzyme complexes of oxidative phosphorylation are in the inner mitochondrial membrane.

The P/O ratio for passing electrons through complexes I,III and IV is ________.

The oxidizing agent in the enzyme superoxide dismutase is

Which complex in the electron transport chain does not contribute to the proton gradient?

Both fumarate reductase and succinate dehydrogenase can function at the same time in E.coli.

What is the role of FMN in 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

Exam 14: Electron Transport and Atp Synthesis

In bacteria,oxidative phosphorylation occurs in the mitochondrial membrane.

The chemiosmotic theory explains that the energy for driving ATP formation in mitochondria comes from a proton concentration gradient.

The number of mitochondria per cell is relatively constant among cell types and species.

Which statement is false about complex IV?

To reduce one molecule of O2,________ electron(s)must be passed through the electron transport chain and ________ molecule(s)of NADH is(are)oxidized.

Which best describe the structure of complex II?

Most of the free energy needed to drive ATP formation in the mitochondria is the result of an electrical contribution from a charge gradient across the inner mitochondrial membrane.

NADH and QH2 for oxidative phosphorylation are produced only through the citric acid cycle under aerobic conditions.

How many protons are translocated across the inner mitochondrial membrane by complex III for each pair of electrons passing through the electron transport chain?

In mammals the enzyme complexes of oxidative phosphorylation are in the inner mitochondrial membrane.

The P/O ratio for passing electrons through complexes I,III and IV is ________.

The oxidizing agent in the enzyme superoxide dismutase is

Which complex in the electron transport chain does not contribute to the proton gradient?

Both fumarate reductase and succinate dehydrogenase can function at the same time in E.coli.

What is the role of FMN in 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

To reduce one molecule of O₂, electron(s)must be passed through the electron transport chain and molecule(s)of NADH is(are)oxidized.

NADH and QH₂ for oxidative phosphorylation are produced only through the citric acid cycle under aerobic conditions.