Question 1

The formation of each pyruvate in glycolysis also produces a net of 2 NADH and 2 ATP.However,each metabolism of glucose produces a net of 4 NADH and 4 ATP.How is this explained?

Accepted Answer

A)  Glucose is cleaved into two three carbon sugars that are metabolized into pyruvate.
B)  Pyruvate can also be fermented,which decreases the energy produced.
C)  Glucose is metabolized by a different,more efficient pathway than pyruvate.
D)  Energy is added to glucose which increases the amount of ATP produced per glucose molecule.E) B) and C)
F) B) and D)

Question 2

The ATP made during glycolysis is generated by

Accepted Answer

A)  substrate-level phosphorylation.
B)  chemiosmosis.
C)  photophosphorylation.
D)  electron transport.
E)  oxidation of NADH to NAD+.F) A) and E)
G) A) and B)

Question 3

What would you predict about a reaction that has a ?G  <<< 
0?

Accepted Answer

A)  The reaction will require energy and is spontaneous.
B)  The reaction will require energy.
C)  The reaction will yield energy.
D)  The reaction is spontaneous.
E)  The reaction will yield energy and is spontaneous. F) B) and D)
G) None of the above

Question 4

Substrate phosphorylation occurs when protons pass through ATP synthase and combine with oxygen to make water.

Accepted Answer

A) True 
 B)False

Question 5

Which would be TRUE if an inhibitor blocked the activity of mitochondrial ATP synthase?

Accepted Answer

A)  The pH in the space between the mitochondrial membranes would decrease.
B)  The pH in the space between the mitochondrial membranes would increase.
C)  Oxygen consumption would decrease.
D)  ATP synthesis would increase.
E)  The concentration of NADH would increasE.F) A) and E)
G) A) and D)

Question 6

In prokaryotic cells,the electron transport system occurs in the mitochondria.

Accepted Answer

A) True 
 B)False

Question 7

The electron transport chain consists of a series of redox reactions in which electrons are transferred to oxygen as the final electron acceptor.

Accepted Answer

A) True 
 B)False

Question 8

The charge on amino acids in the active site of an enzyme would be affected by

Accepted Answer

A)  substrate concentration.
B)  antibiotics.
C)  salt concentration.
D)  temperature.
E)  pH.F) D) and E)
G) None of the above

Question 9

In the citric acid cycle,malate is oxidized to form

Accepted Answer

A)  succinate.
B)  fumarate.
C)  malate.
D)  oxaloacetate.
E)  citratE.F) A) and E)
G) C) and D)

Question 10

How many ATP and NADH molecules are produced from each molecule of glucose in the citric acid cycle only?

Accepted Answer

A)  1 ATP,2 NADH
B)  2 ATP,6 NADH
C)  3 ATP,4 NADH
D)  0 ATP,6 NADH
E)  4 ATP,2 NADHF) B) and D)
G) A) and B)

Question 11

During the energy investment phase of glycolysis,glucose has a decrease in free energy.

Accepted Answer

A) True 
 B)False

Question 12

For a reaction to be spontaneous it must show a net decrease in both energy and entropy.

Accepted Answer

A) True 
 B)False

Question 13

What would your predict about the reaction:  Pi+ADP→ATPP i + A D P \rightarrow A T PPi+ADP→ATP 
?

Accepted Answer

A)  It can be used to drive endergonic reactions.
B)  It yields energy.
C)  It has a change in free energy that is greater than 0,and hence can be used to drive endergonic reactions.
D)  It has a change in free energy that is greater than 0.
E)  It has a change in free energy that is less than 0. F) A) and D)
G) D) and E)

Question 14

When a molecule of NAD+ gains a hydrogen atom,the molecule becomes reduced.

Accepted Answer

A) True 
 B)False

Question 15

Which reaction would require being coupled to the hydrolysis of at least two ATP molecules ( Δ\DeltaΔ G = -14.6 kCal) in order to occur?

Accepted Answer

A)   Δ\DeltaΔ G = -14.6 kCal
B)   Δ\DeltaΔ G = -8 kCal
C)   Δ\DeltaΔ G = +8 kCal
D)   Δ\DeltaΔ G = +16 kCal
E)   Δ\DeltaΔ G = -16 kCal F) A) and B)
G) B) and D)

Question 16

Water held behind a dam would best reflect

Accepted Answer

A)  chemical energy.
B)  mechanical energy.
C)  heat energy.
D)  kinetic energy.
E)  potential energy.F) A) and D)
G) A) and C)

Question 17

In ALL exergonic reactions,

Accepted Answer

A)  the products have more total energy than the reactants.
B)  the reactions are nonspontaneous.
C)  the reaction proceeds with a net release of free energy.
D)  a net input of energy from the surroundings is required for the reactions to proceeD.
E)  some reactants will be converted to products.F) All of the above
G) A) and E)

Question 18

The conversion of pyruvate to acetyl CoA is irreversible.Predict what would happen to fatty acids as a result of this.

Accepted Answer

A)  Fatty acids cannot be converted into carbohydrates.
B)  Fatty acids cannot be metabolized in the citric acid cycle.
C)  Fatty acids can be metabolized in glycolysis.
D)  Fatty acids can be converted into carbohydrates.E) A) and B)
F) C) and D)

Question 19

The equation,C6H12O6 + 6O2  →\rarr→ 6CO2 + 6H2O (ATP + Heat) ,describes what process?

Accepted Answer

A)  photosynthesis
B)  anaerobic metabolism
C)  glycolysis
D)  cell fermentation
E)  cell respiration F) D) and E)
G) B) and E)

Question 20

What are the final by-products of glucose oxidation during aerobic cell respiration?

Accepted Answer

A)  ATP,heat,and carbon dioxide
B)  both ATP and heat only
C)  carbon dioxide only
D)  heat only
E)  ATP onlyF) D) and E)
G) B) and C)

Exam 6: Energy, Enzymes, and Cellular Respiration

The ATP made during glycolysis is generated by

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Substrate phosphorylation occurs when protons pass through ATP synthase and combine with oxygen to make water.

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During the energy investment phase of glycolysis,glucose has a decrease in free energy.

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In ALL exergonic reactions,

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What are the final by-products of glucose oxidation during aerobic cell respiration?

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The conversion of pyruvate to acetyl CoA is irreversible.Predict what would happen to fatty acids as a result of this.

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Water held behind a dam would best reflect

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For a reaction to be spontaneous it must show a net decrease in both energy and entropy.

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Which would be TRUE if an inhibitor blocked the activity of mitochondrial ATP synthase?

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How many ATP and NADH molecules are produced from each molecule of glucose in the citric acid cycle only?

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The charge on amino acids in the active site of an enzyme would be affected by

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The formation of each pyruvate in glycolysis also produces a net of 2 NADH and 2 ATP.However,each metabolism of glucose produces a net of 4 NADH and 4 ATP.How is this explained?

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The equation,C6H12O6 + 6O2 →\rarr→ 6CO2 + 6H2O (ATP + Heat) ,describes what process?

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The electron transport chain consists of a series of redox reactions in which electrons are transferred to oxygen as the final electron acceptor.

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What would your predict about the reaction: Pi+ADP→ATPP i + A D P \rightarrow A T PPi+ADP→ATP ?

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In prokaryotic cells,the electron transport system occurs in the mitochondria.

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What would you predict about a reaction that has a ?G <<< 0?

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Which reaction would require being coupled to the hydrolysis of at least two ATP molecules ( Δ\DeltaΔ G = -14.6 kCal) in order to occur?

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In the citric acid cycle,malate is oxidized to form

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When a molecule of NAD+ gains a hydrogen atom,the molecule becomes reduced.

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The equation,C₆H₁₂O₆ + 6O₂ $\rarr$ 6CO₂ + 6H₂O (ATP + Heat) ,describes what process?

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What would your predict about the reaction: $P i + A D P \rightarrow A T P$ ?

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What would you predict about a reaction that has a ?G $<$ 0?

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Which reaction would require being coupled to the hydrolysis of at least two ATP molecules ( $\Delta$ G = -14.6 kCal) in order to occur?

Correct Answer
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When a molecule of NAD⁺ gains a hydrogen atom,the molecule becomes reduced.

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