Question 1

Intermediate in glycolysis;finally oxidized to pyruvate.

Accepted Answer

A)  ATP
B)  FAD
C)  G3P
D)  NAD+
E)  acetyl-CoAF) B) and C)
G) B) and E)

Question 2

In the absence of oxygen,hydrogen atoms generated by glycolysis are donated to organic molecules in a process called

Accepted Answer

A)  fermentation.
B)  decarboxylation.
C)  chemiosmosis.
D)  electron transport chain reactions.
E)  acetyl-CoA formation.F) A) and B)
G) C) and D)

Question 3

The decarboxylation step of oxidation of pyruvate takes place in the

Accepted Answer

A)  cytoplasm.
B)  Golgi body.
C)  ribosome.
D)  mitochondrion.
E)  nucleus.F) B) and C)
G) B) and E)

Question 4

When ATP levels are high,oxidative pathways are inhibited,so acetyl-CoA is channeled into

Accepted Answer

A)  fatty acid synthesis.
B)  pyruvate formation.
C)  the Krebs cycle.
D)  the electron transport system.
E)  NAD production.F) B) and D)
G) B) and E)

Question 5

The enzymes of the Krebs cycle are located in the

Accepted Answer

A)  cytoplasm.
B)  inter-membrane space of mitochondria.
C)  vesicles of the ER.
D)  outer membrane of the mitochondria.
E)  matrix of the mitochondria.F) None of the above
G) A) and B)

Question 6

For further derivation of energy,aerobic cells must convert pyruvate into acetyl-CoA by stripping off a C02 molecule.This process is known as ___________.

Accepted Answer

A)  decarboxylation
B)  glycolysis
C)  The Kreb's cycle
D)  metabolismE) A) and D)
F) A) and C)

Question 7

The oxygen utilized in cellular respiration finally shows up as

Accepted Answer

A)  CO2.
B)  ATP.
C)  new O2.
D)  H2O.
E)  part of a sugar.F) A) and B)
G) B) and E)

Question 8

Cytochromes are respiratory proteins.Which of the following statements accurately reflects their true nature?

Accepted Answer

A)  Cytochrome proteins reside free in the lung cells of all vertebrates.These molecules contain a heme group with an iron atom at its center.
B)  Cytochrome proteins reside in the mitochondria and are specifically associated with the electron transport system.
C)  Cytochrome proteins reside in the mitochondria and are specifically associated with the Kreb cycle.
D)  Cytochrome proteins reside in the mitochondria and are specifically associated with glycolysis.E) B) and C)
F) B) and D)

Question 9

Pyruvate oxidation;carrier of acetyl groups.

Accepted Answer

A)  ATP
B)  FAD
C)  G3P
D)  NAD+
E)  acetyl-CoAF) C) and E)
G) B) and D)

Question 10

Chief energy currency of cells;formed by chemiosmosis.

Accepted Answer

A)  ATP
B)  FAD
C)  G3P
D)  NAD+
E)  acetyl-CoAF) B) and D)
G) All of the above

Question 11

A biochemist wants to control the initial substrate-level phosphorylation that occurs in the tracheal cells of grasshoppers once glucose has crossed the plasma membrane.This means that he will

Accepted Answer

A)  have to prevent cAMP from entering the tracheal cells.
B)  have to prevent pyruvate reduction from occurring.
C)  have to prevent glycolysis from occurring in the mitochondria.
D)  have to prevent glycolysis from occurring in the cytoplasm.
E)  have to prevent aerobic respiration in the cytoplasm.F) C) and D)
G) A) and B)

Question 12

The reaction,C6H6O6 + 6O2 = 6 CO2 + 6 H2O,when it occurs in living cells is known as

Accepted Answer

A)  aerobic fermentation.
B)  anaerobic fermentation.
C)  aerobic respiration.
D)  glycolysis.
E)  oxidative phosphorylation.F) C) and E)
G) A) and E)

Question 13

All of the following are the end products of glycolysis except

Accepted Answer

A)  pyruvate.
B)  ATP.
C)  NADH.
D)  NAD+.
E)  energy.F) C) and E)
G) B) and E)

Question 14

The energy released in the mitochondrial electron transport chain is used to transport protons into the

Accepted Answer

A)  matrix.
B)  cytoplasm.
C)  ER.
D)  inter-membrane space of mitochondria.
E)  enzyme complex of the Krebs cyclE.F) A) and C)
G) A) and B)

Question 15

Organisms that can manufacture their own chemical energy sources are called _____________.

Accepted Answer

A)  autotrophs
B)  heterotrophs
C)  oligotrophs
D)  chemotrophsE) All of the above
F) A) and B)

Question 16

The amino acids must be first __________ before they can be used in catabolic reactions.

Accepted Answer

A)  stripped
B)  proteins
C)  deoxygenated
D)  deaminatedE) B) and C)
F) A) and D)

Question 17

Which of the following molecules does not cross the inner membrane of the mitochondria?

Accepted Answer

A)  ATP
B)  acetyl-CoA
C)  pyruvate
D)  oxygenE) A) and C)
F) B) and D)

Question 18

The chemical 2,4 dinitrophenol (DNP) is used in the manufacturing of dyes,wood preservatives,explosives,and insect control substances,and as a photographic developer.Products containing DNP are toxic because DNP uncouples oxidative phosphorylation.In a cell exposed to DNP,how many ATP molecules would be generated per molecule of glucose?

Accepted Answer

A)  2
B)  4
C)  36
D)  38E) All of the above
F) A) and B)

Question 19

Which of the following statements about fermentation is false?

Accepted Answer

A)  Fermentation takes place only in the absence of oxygen.
B)  The recipient of hydrogen atoms is an organic molecule.
C)  Water is not one of the by-products.
D)  The Krebs cycle and electron transfer system do not occur.
E)  Cells can only undergo one type of fermentation.F) B) and C)
G) A) and E)

Question 20

Since membranes are relatively impermeable to ions,most of the protons re-enter the matrix by passing through special channels in the inner mitochondrial membrane.Because of the inward flow of protons these channels allow the synthesis of

Accepted Answer

A)  ADP from ATP and Pi.
B)  ATP from ADP and Pi.
C)  glucose from pyruvate.
D)  acetyl-CoA from pyruvate.
E)  citrate from oxaloacetate and acetyl-CoA.F) A) and D)
G) A) and E)

Exam 7: How Cells Harvest Energy

Which of the following molecules does not cross the inner membrane of the mitochondria?

Correct Answer
verified

Since membranes are relatively impermeable to ions,most of the protons re-enter the matrix by passing through special channels in the inner mitochondrial membrane.Because of the inward flow of protons these channels allow the synthesis of

Correct Answer
verified

Correct Answer
verified

The oxygen utilized in cellular respiration finally shows up as

Correct Answer
verified

The reaction,C₆H₆O₆ + 6O₂ = 6 CO₂ + 6 H₂O,when it occurs in living cells is known as

Correct Answer
verified

Pyruvate oxidation;carrier of acetyl groups.

Correct Answer
verified

Which of the following statements about fermentation is false?

Correct Answer
verified

Chief energy currency of cells;formed by chemiosmosis.

Correct Answer
verified

The enzymes of the Krebs cycle are located in the

Correct Answer
verified

A biochemist wants to control the initial substrate-level phosphorylation that occurs in the tracheal cells of grasshoppers once glucose has crossed the plasma membrane.This means that he will

Correct Answer
verified

For further derivation of energy,aerobic cells must convert pyruvate into acetyl-CoA by stripping off a C0₂ molecule.This process is known as ___________.

Correct Answer
verified

When ATP levels are high,oxidative pathways are inhibited,so acetyl-CoA is channeled into

Correct Answer
verified

In the absence of oxygen,hydrogen atoms generated by glycolysis are donated to organic molecules in a process called

Correct Answer
verified

The decarboxylation step of oxidation of pyruvate takes place in the

Correct Answer
verified

The amino acids must be first __________ before they can be used in catabolic reactions.

Correct Answer
verified

Cytochromes are respiratory proteins.Which of the following statements accurately reflects their true nature?

Correct Answer
verified

The energy released in the mitochondrial electron transport chain is used to transport protons into the

Correct Answer
verified

Organisms that can manufacture their own chemical energy sources are called _____________.

Correct Answer
verified

All of the following are the end products of glycolysis except

Correct Answer
verified

Intermediate in glycolysis;finally oxidized to pyruvate.

Correct Answer
verified

Exam 7: How Cells Harvest Energy

Which of the following molecules does not cross the inner membrane of the mitochondria?

Correct AnswerverifiedShow Answer

Since membranes are relatively impermeable to ions,most of the protons re-enter the matrix by passing through special channels in the inner mitochondrial membrane.Because of the inward flow of protons these channels allow the synthesis of

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The oxygen utilized in cellular respiration finally shows up as

Correct AnswerverifiedShow Answer

The reaction,C6H6O6 + 6O2 = 6 CO2 + 6 H2O,when it occurs in living cells is known as

Correct AnswerverifiedShow Answer

Pyruvate oxidation;carrier of acetyl groups.

Correct AnswerverifiedShow Answer

Which of the following statements about fermentation is false?

Correct AnswerverifiedShow Answer

Chief energy currency of cells;formed by chemiosmosis.

Correct AnswerverifiedShow Answer

The enzymes of the Krebs cycle are located in the

Correct AnswerverifiedShow Answer

A biochemist wants to control the initial substrate-level phosphorylation that occurs in the tracheal cells of grasshoppers once glucose has crossed the plasma membrane.This means that he will

Correct AnswerverifiedShow Answer

For further derivation of energy,aerobic cells must convert pyruvate into acetyl-CoA by stripping off a C02 molecule.This process is known as ___________.

Correct AnswerverifiedShow Answer

When ATP levels are high,oxidative pathways are inhibited,so acetyl-CoA is channeled into

Correct AnswerverifiedShow Answer

In the absence of oxygen,hydrogen atoms generated by glycolysis are donated to organic molecules in a process called

Correct AnswerverifiedShow Answer

The decarboxylation step of oxidation of pyruvate takes place in the

Correct AnswerverifiedShow Answer

The amino acids must be first __________ before they can be used in catabolic reactions.

Correct AnswerverifiedShow Answer

Cytochromes are respiratory proteins.Which of the following statements accurately reflects their true nature?

Correct AnswerverifiedShow Answer

The energy released in the mitochondrial electron transport chain is used to transport protons into the

Correct AnswerverifiedShow Answer

Organisms that can manufacture their own chemical energy sources are called _____________.

Correct AnswerverifiedShow Answer

All of the following are the end products of glycolysis except

Correct AnswerverifiedShow Answer

Intermediate in glycolysis;finally oxidized to pyruvate.

Correct AnswerverifiedShow Answer

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Correct Answer
verified

The reaction,C₆H₆O₆ + 6O₂ = 6 CO₂ + 6 H₂O,when it occurs in living cells is known as

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

For further derivation of energy,aerobic cells must convert pyruvate into acetyl-CoA by stripping off a C0₂ molecule.This process is known as ___________.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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