Question 1

Complex IV in the mitochondrial electron transport chain belongs to which enzyme class?

Accepted Answer

A)   lyase
B)   hydrolase
C)   transferase
D)   oxidoreductase

Question 2

Use the following picture of a mitochondrion and label the (A) matrix, (B) crista, (c) inner membrane space, (D) cytoplasm, (E) inner membrane, (F) outer membrane, (G) location of the ATP synthesis, (H) location of elevated pH, and (I) the location of the electron transport system complexes.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> In addition, (D) the cytoplasm is outsi...

Question 3

List the order of enzymes, enzyme complexes, and membrane soluble electron carriers that an electron is passed through on its way from NADH to O2 in the electron transport system.

Accepted Answer

NADH

complex I

ubi...

Question 4

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.

Question 5

Which of the following statements about the chemiosmotic theory is true?

Accepted Answer

A)   It requires an enclosed mitochondrial membrane.
B)   The membrane ATPase (or ATP synthase)  has no significant role in the theory.
C)   Energy is coupled through a transmembrane electron gradient.
D)   It explains how ATP energy is used to create a pH gradient.

Question 6

For one electron entering the electron transport chain at complex I, how many times is it handed off between redox active cofactors on its way through the enzyme complexes to end up on O2?

Accepted Answer

A)   ~2000
B)   ~200
C)   ~20
D)   ~2

Question 7

Protons are pumped by mitochondria during active electron transport

Accepted Answer

A)   into the thylakoid lumen.
B)   outside the outer mitochondrial membrane.
C)   into the mitochondrial matrix.
D)   outside the inner mitochondrial membrane.

Question 8

Explain how ATP synthase can be used as primary active transporter of H+ and pump protons.

Accepted Answer

ATP synthase can be run in the reverse d...

Question 9

ATP synthase is located in or on the

Accepted Answer

A)   cytoplasm.
B)   intermembrane space of the mitochondria.
C)   inner mitochondrial membrane.
D)   outer mitochondrial membrane.

Question 10

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

Question 11

What is the reaction catalyzed by complex III in the electron transport system?

Accepted Answer

A)   UQH2 + O2 →\rightarrow→ UQ + H2O
B)   UQH2 + complex IV+  →\rightarrow→ UQ + complex IV
C)   FADH2 + UQ  →\rightarrow→  FAD + UQH2
D)   UQH2 + cytochrome c+  →\rightarrow→ UQ + cytochrome c

Question 12

Protons in the mitochondria are

Accepted Answer

A)   the driving force for the electron transfers in the electron transport system.
B)   pumped by mitochondrial electron transport system enzymes.
C)   pumped inside the mitochondria using ATP energy.
D)   the cause of a lower pH inside the mitochondria than outside the mitochondria.

Question 13

The __________ causes the catalytic headpiece of ATP synthase to change conformation.

Accepted Answer

A)   rotation of the circle of the  α\alphaα 3 β\betaβ 3 subunits
B)   movement of the circle of ~10 c subunits
C)   interaction with the rotating central  γ\gammaγ  subunit
D)   binding of ADP and Pi

Question 14

Which statement is true of the mitochondrial electron transport system?

Accepted Answer

A)   All the electron carriers are located in enzyme complexes.
B)   All the electrons in the chain end up on O2 to produce water.
C)   The pH drops in the mitochondria as electrons pass through the system.
D)   Protons are pumped from the inner membrane space to the mitochondrial matrix during the electron transfer.

Question 15

On the left hand side of the figure, label the regions above and below the lipid membrane assuming the process occurs in mitochondria. On the right hand side, label the regions assuming the process occurs in chloroplasts.

Accepted Answer

The answer of On the left hand side of the...

Question 16

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

Accepted Answer

Brown adipose tissue is brown ...

Question 17

A decrease in would be LEAST likely to affect the processes of the electron transport system.

Accepted Answer

A)   oxygen concentrations in the cell
B)   the TCA cycle activity
C)   cellular CO2 concentrations
D)   the concentration of cellular NADH

Question 18

Thermogenin (or uncoupling protein)  is not toxic like 2,4-dinitrophenol because the protein

Accepted Answer

A)   is typically expressed in adipose tissues where ample fat calories are found.
B)   is less efficient at proton dissipation.
C)   cannot leave the mitochondria.
D)   is naturally occurring and not synthetic.

Question 19

Which statement comparing chloroplasts and mitochondria is true?

Accepted Answer

A)   Chloroplasts and mitochondria each contain two membranes.
B)   Chloroplasts and mitochondria use electrons from NADH to create a proton gradient.
C)   Chloroplasts pump protons outside the organelle, while mitochondria pump protons inside the inner part of the organelle.
D)   Chloroplasts and mitochondria use energy from a proton gradient to make ATP.

Question 20

Explain why many mitochondrial diseases are inherited from the mother only.

Accepted Answer

Many of the proteins in the mitochondria...

Exam 11: Oxidative Phosphorylation

What is the reaction catalyzed by complex III in the electron transport system?

Correct AnswerverifiedShow Answer

Protons are pumped by mitochondria during active electron transport

Correct AnswerverifiedShow Answer

Use the following picture of a mitochondrion and label the (A) matrix, (B) crista, (c) inner membrane space, (D) cytoplasm, (E) inner membrane, (F) outer membrane, (G) location of the ATP synthesis, (H) location of elevated pH, and (I) the location of the electron transport system complexes.

Correct Answerverified In addition, (D) the cytoplasm is outsi...View AnswerShow Answer

A decrease in would be LEAST likely to affect the processes of the electron transport system.

Correct AnswerverifiedShow Answer

On the left hand side of the figure, label the regions above and below the lipid membrane assuming the process occurs in mitochondria. On the right hand side, label the regions assuming the process occurs in chloroplasts.

Correct AnswerverifiedShow Answer

Which statement comparing chloroplasts and mitochondria is true?

Correct AnswerverifiedShow Answer

List the order of enzymes, enzyme complexes, and membrane soluble electron carriers that an electron is passed through on its way from NADH to O2 in the electron transport system.

Correct AnswerverifiedNADH complex I ubi...View AnswerShow Answer

The __________ causes the catalytic headpiece of ATP synthase to change conformation.

Correct AnswerverifiedShow Answer

Protons in the mitochondria are

Correct AnswerverifiedShow Answer

For one electron entering the electron transport chain at complex I, how many times is it handed off between redox active cofactors on its way through the enzyme complexes to end up on O2?

Correct AnswerverifiedShow Answer

Which statement is true of the mitochondrial electron transport system?

Correct AnswerverifiedShow Answer

Complex IV in the mitochondrial electron transport chain belongs to which enzyme class?

Correct AnswerverifiedShow Answer

Which of the following statements about the chemiosmotic theory is true?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedBrown adipose tissue is brown ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Thermogenin (or uncoupling protein) is not toxic like 2,4-dinitrophenol because the protein

Correct AnswerverifiedShow Answer

Explain why many mitochondrial diseases are inherited from the mother only.

Correct AnswerverifiedMany of the proteins in the mitochondria...View AnswerShow Answer

ATP synthase is located in or on the

Correct AnswerverifiedShow Answer

Explain how ATP synthase can be used as primary active transporter of H+ and pump protons.

Correct AnswerverifiedATP synthase can be run in the reverse d...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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Correct Answer
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In addition, (D) the cytoplasm is outsi...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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List the order of enzymes, enzyme complexes, and membrane soluble electron carriers that an electron is passed through on its way from NADH to O₂ in the electron transport system.

Correct Answer
verified
NADH complex I ubi...
View Answer

Correct Answer
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Correct Answer
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For one electron entering the electron transport chain at complex I, how many times is it handed off between redox active cofactors on its way through the enzyme complexes to end up on O₂?

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
Brown adipose tissue is brown ...
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Correct Answer
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Correct Answer
verified

Correct Answer
verified
Many of the proteins in the mitochondria...
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Correct Answer
verified

Explain how ATP synthase can be used as primary active transporter of H⁺and pump protons.

Correct Answer
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ATP synthase can be run in the reverse d...
View Answer

Correct Answer
verified