Question 1

Why are mitochondria so prevalent in skeletal muscle?

Accepted Answer

A)  They are needed to provide energy for muscle contraction.
B)  The flow of blood is greatest in skeletal muscle.
C)  They are needed to repair damaged tissue that accumulates during exercise.
D)  They give the muscle enough elasticity to contract.
E)  Bones and muscles require a great deal of energy to prevent them from separating. A

Question 2

NADH concentrations serve to regulate oxidative decarboxylation and the TCA cycle. Which of the following enzymes is NOT regulated by NADH?

Accepted Answer

A)  malate dehydrogenase
B)  pyruvate dehydrogenase
C)  isocitrate dehydrogenase
D)  succinate dehydrogenase
E)  a ketoglutarate dehydrogenase D

Question 3

The reduction of NAD+ to NADH (and H+)occurs both in the and in the
of the _ .

Accepted Answer

cytoplasm; matrix; mitochondria

Question 4

Multiple protein complexes associated with the cellular respiration are known as

Accepted Answer

A)  synthesomes.
B)  respirasomes.
C)  Fe- S centers.
D)  Q cycles.
E)  chemiosmotic coupling complexes.

Question 5

The sequential process of fatty acid catabolism to acetyl CoA is called

Accepted Answer

A)  the glyoxylate cycle.
B)  fi- oxidation.
C)  oxidative phosphorylation.
D)  hydrogenation.
E)  the Cori cycle.

Question 6

Which of the following is NOT one of the major transport systems of the inner mitochondrial membrane?

Accepted Answer

A)  sodium- potassium pump
B)  pyruvate carrier cotransport
C)  ATP- ADP carrier exchange
D)  dicarboxylate carriers
E)  tricarboxylate carriers

Question 7

Of the carrier molecules in the electron transport chain, which has heme as part of its prosthetic group?

Accepted Answer

A)  copper- containing cytochromes
B)  cytochromes
C)  flavoproteins
D)  coenzyme Q
E)  iron- sulfur proteins

Question 8

is the oxidation- driven flow of electrons, through or within a membrane, from reduced coenzymes to an electron acceptor. It is usually accompanied by the generation of ATP.

Accepted Answer

The answer of is the oxidation- driven flow of electrons,...

Question 9

Because the TCA cycle is associated with degradation and synthesis, the pathway is said to be

Accepted Answer

A)  amphipathic.
B)  amphibolic.
C)  anabolic.
D)  catabolic.
E)  bipolar.

Question 10

In prokaryotes, aerobic respiration generates ATP molecules.

Accepted Answer

A)  15
B)  2
C)  38
D)  42
E)  0

Question 11

Which of the numbered respiratory complexes is NOT correctly paired with its name?

Accepted Answer

A)  complex II: succinate- coenzyme Q oxidoreductase complex
B)  complex III: coenzyme Q- cytochrome c oxidoreductase complex
C)  complex I: NADH dehydrogenase complex
D)  complex IV: cytochrome c reductase complex
E)  none of the above

Question 12

Crista junctions

Accepted Answer

A)  limit the movement of products between the intracristae and intermembrane spaces.
B)  are large pores.
C)  are associated with the thylakoid membrane system.
D)  are associated with the movement of materials from the cytosol into the mitochondrion.
E)  contain the mitochondrial DNA.

Question 13

Of the following electron carriers of the electron transport system, which transfers protons in addition to electrons?

Accepted Answer

A)  iron- copper proteins
B)  cytochrome b
C)  cytochrome a
D)  coenzyme Q
E)  iron- sulfur proteins

Question 14

The chemiosmotic model of ATP synthesis is based on several lines of experimental evidence. Which of the following statements is NOT correct experimental evidence to support the chemiosmotic model?

Accepted Answer

A)  Oxidative phosphorylation does not require a membrane- enclosed compartment.
B)  The proton gradient established by electron transport has enough energy to drive ATP synthesis.
C)  Uncoupling agents abolish both the proton gradient and ATP synthesis.
D)  Electron transport causes protons to be pumped out of the mitochondrial matrix.
E)  Artificial proton gradients established by addition of acid can drive ATP synthesis in the absence of electron transport.

Question 15

As pyruvate is prepared for the TCA cycle, it undergoes a process of

Accepted Answer

A)  CoQ reproduction.
B)  oxidative decarboxylation.
C)  reductive carboxylation.
D)  oxidative carboxylation.
E)  reductive decarboxylation.

Question 16

Which of the following molecules is NOT a carrier of electrons in the electron transport system (ETS)?

Accepted Answer

A)  coenzyme Q
B)  flavoproteins
C)  copper- nickel compounds
D)  iron- sulfur proteins
E)  cytochromes

Question 17

Which of the following would NOT be used as a final electron acceptor in anaerobic respiration?

Accepted Answer

A)  sulfur
B)  oxygen
C)  nitrogen
D)  iron
E)  protons

Question 18

The Q cycle

Accepted Answer

A)  accounts for the generation of superoxide.
B)  mediates the transfer of electrons to oxygen.
C)  allows for the movement of protons without additional electrons.
D)  is associated with complex I.
E)  all of the above

Question 19

In eukaryotes, pyruvate is converted to acetyl CoA

Accepted Answer

A)  in the intermembrane space.
B)  in the cellular cytosol.
C)  in the mitochondrial matrix.
D)  when passing through the mitochondrial outer membrane.
E)  when passing the mitochondrial cristae.

Question 20

Which of the following processes is associated with the outer mitochondrial membrane?

Accepted Answer

A)  phospholipid synthesis
B)  fi- oxidation of fats
C)  metabolite transport
D)  transcription
E)  ATP synthesis

Exam 10: Chemotrophic Energy Metabolism: Aerobic Respiration