Question 1

The electron transport chain component that transfers electrons directly to oxygen is

Accepted Answer

A)  complex I. 
B)  cytochrome c. 
C)  complex IV. 
D)  NADH. 
A)  complex I. 
B)  cytochrome c. 
C)  complex IV. 
D)  NADH.

Question 2

The energy released during mitochondrial electron transport processes is used to

Accepted Answer

A)  make ATP. 
B)  pump protons across the membrane. 
C)  heat the mitochondria. 
D)  synthesize carbohydrates. 
A)  make ATP. 
B)  pump protons across the membrane. 
C)  heat the mitochondria. 
D)  synthesize carbohydrates.

Question 3

In the mitochondrial electron transport system,the electron from NADH moves from __________ the mitochondria through the protein complexes to __________ the mitochondria.

Accepted Answer

A)  outside; outside 
B)  outside; inside 
C)  inside; inside 
D)  inside; outside 
A)  outside; outside 
B)  outside; inside 
C)  inside; inside 
D)  inside; outside

Question 4

The resting state of the three   subunits in the ATP synthase enzyme is best described as

Accepted Answer

A)  one O, one L, and one T conformation. 
B)  all in O conformations. 
C)  all in L conformations. 
D)  one L and two O conformations. 
A)  one O, one L, and one T conformation. 
B)  all in O conformations. 
C)  all in L conformations. 
D)  one L and two O conformations.

Question 5

Add to the malate-aspartate shuttle scheme below the missing reactant and products a,b,c,and
d.

Accepted Answer

The answer of Add to the malate-aspartate shuttle scheme below...

Question 6

The ultimate electron acceptor of the mitochondrial electron transport system is

Accepted Answer

A)  O2. 
B)  NADH. 
C)  H2O. 
D)  cytochrome c. 
A)  O2. 
B)  NADH. 
C)  H2O. 
D)  cytochrome c.

Question 7

Mitochondria

Accepted Answer

A)  have a porous inner membrane and nonporous outer membrane. 
B)  have a higher pH inside the matrix than outside during active electron transport. 
C)  have an outer membrane that is composed of lipids and protein electron transport complexes. 
D)  generate ATP for the cell under anaerobic and aerobic conditions. 
A)  have a porous inner membrane and nonporous outer membrane. 
B)  have a higher pH inside the matrix than outside during active electron transport. 
C)  have an outer membrane that is composed of lipids and protein electron transport complexes. 
D)  generate ATP for the cell under anaerobic and aerobic conditions.

Question 8

Draw a diagram of the mitochondrion and indicate which side of the organelle has a net positive charge and which side has a net negative charge as a result of proton pumping.

Accepted Answer

@#IMG-DLM&_TB6697_00 Outside t

Question 9

Explain the origin of the brown color of brown adipose tissue.

Accepted Answer

Brown adipose tissue is brown

Question 10

Use the table below to (A)write out the balanced reaction between NADH and O2 that drives the electron transport system and (B)compute the standard reduction potential.

Accepted Answer

2NADH + O₂ + 2H⁺ @#IMG-DLM&_TB66

Question 11

Identify the correct order of electron transfers in the electron transport chain starting from FADH2.

Accepted Answer

A)  complex I  Complex II  Complex III  Complex IV 
B)  complex II  Complex III  Cytochrome c  Complex IV 
C)  complex II  Coenzyme Q  Complex IV  ATP synthase 
D)  complex I  Coenzyme Q  Complex III  Complex IV 
A)  complex I  Complex II  Complex III  Complex IV 
B)  complex II  Complex III  Cytochrome c  Complex IV 
C)  complex II  Coenzyme Q  Complex IV  ATP synthase 
D)  complex I  Coenzyme Q  Complex III  Complex IV

Question 12

Which part of the native ATP synthase enzyme is stationary and does NOT rotate during ATP synthesis?

Accepted Answer

A)  the rotor 
B)  the circle of c subunits 
C)  the central  
Subunit connecting the rotor to the catalytic headpiece 
D)  the catalytic headpiece 
A)  the rotor 
B)  the circle of c subunits 
C)  the central  
Subunit connecting the rotor to the catalytic headpiece 
D)  the catalytic headpiece

Question 13

Which reaction does the concept of oxidative phosphorylation refer to?

Accepted Answer

A)  O2 + ADP + Pi  2 H2O + ATP 
B)  NADH + H+ + 1/2 O2  NAD+ + H2O 
C)  ADP + Pi  ATP 
D)  NADH + 1/2  O2 + H+ + ADP + Pi  NAD+ + ATP + H2O 
A)  O2 + ADP + Pi  2 H2O + ATP 
B)  NADH + H+ + 1/2 O2  NAD+ + H2O 
C)  ADP + Pi  ATP 
D)  NADH + 1/2  O2 + H+ + ADP + Pi  NAD+ + ATP + H2O

Question 14

Electrons from a succinate molecule can enter into the ETC and result in enough pumped protons to make how many ATPs?

Accepted Answer

A)  2.0 
B)  1.5 
C)  1.0 
D)  2.5 
A)  2.0 
B)  1.5 
C)  1.0 
D)  2.5

Question 15

The structure of 2,4-dinitrophenol is shown below.Explain how it functions to uncouple a proton gradient across the mitochondrial membrane.

Accepted Answer

@#IMG-DLM&_TB6697_00 2,4-dinitrophenol is nonpolar

Question 16

In yeast,it is estimated that approximately __________ H+ are required by ATP synthase per ATP synthesized.

Accepted Answer

A)  1 
B)  3 
C)  9 
D)  10 
A)  1 
B)  3 
C)  9 
D)  10

Question 17

Which animal would have the lowest levels of brown adipose tissue?

Accepted Answer

A)  newborn human 
B)  hibernating squirrel 
C)  migrating duck 
D)  polar bear 
A)  newborn human 
B)  hibernating squirrel 
C)  migrating duck 
D)  polar bear

Question 18

What happens to patients given the proton gradient uncoupler 2,4-dinitrophenol?

Accepted Answer

A)  They undergo rapid decrease in body temperature as a result of lack of mitochondrial electron transport. 
B)  They experience lower cellular pH as a result of rapid proton gradient dissipation. 
C)  Their mitochondrial membranes fail as a result of rapid proton gradient release. 
D)  Their body temperatures rise as a result of heat release from gradient uncoupling. 
A)  They undergo rapid decrease in body temperature as a result of lack of mitochondrial electron transport. 
B)  They experience lower cellular pH as a result of rapid proton gradient dissipation. 
C)  Their mitochondrial membranes fail as a result of rapid proton gradient release. 
D)  Their body temperatures rise as a result of heat release from gradient uncoupling.

Question 19

How are many mitochondrial diseases passed on from parents to offspring?

Accepted Answer

A)  through the mother only 
B)  through the father only 
C)  through an equal distribution from both parents 
D)  by random mutations in the mitochondrial genome 
A)  through the mother only 
B)  through the father only 
C)  through an equal distribution from both parents 
D)  by random mutations in the mitochondrial genome

Question 20

The electron transport complexes found in the electron transport system

Accepted Answer

A)  contain multiple electron transfer cofactors that facilitate electron transfer through the complexes. 
B)  are bound to the outer mitochondrial membrane. 
C)  pump protons from outside the mitochondria to the mitochondrial matrix on electron transfer. 
D)  absorb light energy that results in electron transfer. 
A)  contain multiple electron transfer cofactors that facilitate electron transfer through the complexes. 
B)  are bound to the outer mitochondrial membrane. 
C)  pump protons from outside the mitochondria to the mitochondrial matrix on electron transfer. 
D)  absorb light energy that results in electron transfer.

Exam 11: Oxidative Phosphorylation

The electron transport chain component that transfers electrons directly to oxygen is

The energy released during mitochondrial electron transport processes is used to

In the mitochondrial electron transport system,the electron from NADH moves from __________ the mitochondria through the protein complexes to __________ the mitochondria.

The resting state of the three subunits in the ATP synthase enzyme is best described as

Add to the malate-aspartate shuttle scheme below the missing reactant and products a,b,c,and d.

The ultimate electron acceptor of the mitochondrial electron transport system is

Mitochondria

Draw a diagram of the mitochondrion and indicate which side of the organelle has a net positive charge and which side has a net negative charge as a result of proton pumping.

Explain the origin of the brown color of brown adipose tissue.

Use the table below to (A)write out the balanced reaction between NADH and O2 that drives the electron transport system and (B)compute the standard reduction potential.

Identify the correct order of electron transfers in the electron transport chain starting from FADH2.

Which part of the native ATP synthase enzyme is stationary and does NOT rotate during ATP synthesis?

Which reaction does the concept of oxidative phosphorylation refer to?

Electrons from a succinate molecule can enter into the ETC and result in enough pumped protons to make how many ATPs?

The structure of 2,4-dinitrophenol is shown below.Explain how it functions to uncouple a proton gradient across the mitochondrial membrane.

In yeast,it is estimated that approximately __________ H+ are required by ATP synthase per ATP synthesized.

Which animal would have the lowest levels of brown adipose tissue?

What happens to patients given the proton gradient uncoupler 2,4-dinitrophenol?

How are many mitochondrial diseases passed on from parents to offspring?

The electron transport complexes found in the electron transport system

Principles of Biochemistry

Physical Biochemistry: Energy Conversion,water,and Membranes

Nucleic Acid Structure and Function

Protein Structure

Methods in Protein Biochemistry

Protein Function

Enzyme Mechanisms

Cell Signaling Systems

Glycolysis: a Paradigm of Metabolic Regulation

The Citrate Cycle

Photosynthesis

Carbohydrate Structure and Function

Carbohydrate Metabolism

Lipid Structure and Function

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Metabolic Integration

Dna Replication, repair, and Recombination

Rna Synthesis, processing, and Gene Silencing

Protein Synthesis, posttranslational Modification, and Transport

Gene Regulation

Filters

In the mitochondrial electron transport system,the electron from NADH moves from the mitochondria through the protein complexes to the mitochondria.

Use the table below to (A)write out the balanced reaction between NADH and O₂ that drives the electron transport system and (B)compute the standard reduction potential.

Identify the correct order of electron transfers in the electron transport chain starting from FADH₂.

In yeast,it is estimated that approximately __________ H⁺ are required by ATP synthase per ATP synthesized.