Question 1

Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis,the Citric acid cycle and electron transport.Your best advice would be to

Accepted Answer

A)  follow ATP production.
B)  follow the protons.
C)  follow NAD+ production.
D)  follow the electrons.E) A) and D)
F) B) and D)

Question 2

What aspect of cellular respiration occurs in the cytoplasm in eukaryotic cells?

Accepted Answer

A)  Glycolysis
B)  Pyruvate oxidation
C)  The Citric acid cycle
D)  The electron transport chain
E)  ATP synthesisF) B) and D)
G) B) and C)

Question 3

Aerobic respiration involves the transfer of many electrons from glucose to electron carriers such as NAD+ over a series of multiple steps.Ultimately though,it is the reaction of glucose with oxygen to generate carbon dioxide,water and energy.Why doesn't glucose react directly with oxygen in cells?

Accepted Answer

A)  Oxygen cannot accept electrons,and thus an electron carrier like NAD+ is needed.
B)  Oxygen and glucose are localized in different subcellular compartments.
C)  The direct reaction of oxygen with glucose would be extremely destructive to cells.
D)  The reaction of oxygen with glucose is not spontaneous.E) B) and C)
F) C) and D)

Question 4

Why is the energy generated from the catabolism of sugars and other macromolecules ultimately harnessed to generate ATP?

Accepted Answer

A)  ATP can be used by cells to drive endergonic reactions
B)  ATP can be used to make RNA,which is an energy storage molecule in the cell
C)  ATP synthesis is an exergonic reaction
D)  ATP is required to generate the proton gradient in the intermembrane space of mitochondriaE) None of the above
F) All of the above

Question 5

When oxygen is unavailable during heavy exercise what process do muscle cells use for energy generation?

Accepted Answer

A)  Glycolysis coupled with alcohol fermentation
B)  Anaerobic respiration
C)  Aerobic respiration
D)  Glycolysis coupled with lactate fermentationE) All of the above
F) C) and D)

Question 6

Phosphofructokinase is regulated by a number of factors,including high levels of ATP.Why is this enzyme regulated by ATP levels?

Accepted Answer

A)  If ATP levels are high,this provides a mechanism to directly inhibit the Citric acid cycle,thus preventing further generation of NADH,FADH2 and ATP molecules that are not needed.
B)  If ATP levels are high,it is important to directly inhibit the reaction that commits the substrate to glycolysis to allow the substrate to be available for other reactions,since the cell has ample energy.
C)  If ATP levels are high,it is important to inhibit ATP synthase,and phosphofructokinase directly inhibits ATP synthase.
D)  If ATP levels are high,this provides a mechanism to directly inhibit the electron transport chain,thus preventing the formation of a proton gradient in the intermembrane space of mitochondria.E) A) and D)
F) All of the above

Question 7

In order to lose weight and reduce body fat,a friend of yours has decided to eliminate all fat from his diet,while consuming unrestricted amounts of carbohydrates.What do you think of this idea?

Accepted Answer

A)  It is a good idea,because if your friend doesn't eat any fat,he cannot store any additional fat.
B)  It is a bad idea,because consumption of fat is required to provide cofactors for the electron transport chain.
C)  It is a good idea,because under conditions where ATP levels are low in cells,carbohydrates will be stored,and fat stores will be catabolized via beta-oxidation to generate energy.
D)  It is a bad idea,because if ATP levels are high in cells,excess acetyl-CoA from the metabolism of carbohydrates can be used for fatty acid synthesis.E) B) and C)
F) C) and D)

Question 8

What stage of cellular respiration can occur in human cells with or without oxygen present?

Accepted Answer

A)  The Citric acid cycle
B)  Glycolysis
C)  The electron transport chain
D)  Pyruvate oxidationE) A) and B)
F) A) and C)

Question 9

What molecule can oxidize NADH?

Accepted Answer

A)  Acetaldehyde
B)  Lactate
C)  Ubiquinone
D)  Glucose
E)  IsocitrateF) All of the above
G) A) and B)

Question 10

Glucose is not our only food source,nor the only one we can utilize in our bodies to generate energy.Other primary sources of energy include other sugars,proteins,and fats.What metabolic intermediate are fats primarily converted into?

Accepted Answer

A)  Pyruvate
B)  Acetyl-CoA
C)  Citric acid cycle intermediates
D)  Electron transport chain components
E)  ATP SynthaseF) B) and E)
G) B) and D)

Question 11

All of the reactions of cellular respiration that occur after glycolysis take place in what part of the eukaryotic cell?

Accepted Answer

A)  The chloroplast
B)  The nucleus
C)  The mitochondria
D)  The plasma membrane
E)  The cytoplasmF) All of the above
G) C) and D) C

Question 12

If you take into account the amount of ATP generated by ATP synthase per molecule of NADH and per molecule of FADH2 produced,and the number of ATP molecules produced by substrate-level phosphorylation,what is the predicted energy yield of the Citric acid cycle,per molecule of glucose in eukaryotic cells?

Accepted Answer

A)  18 ATP
B)  2 ATP
C)  10 ATP
D)  20 ATP
E)  30 ATPF) A) and B)
G) A) and E)

Question 13

What is the oxidized form of the most common electron carrier that is needed for both glycolysis and the Citric acid cycle?

Accepted Answer

A)  ATP
B)  FAD
C)  pyruvate
D)  NAD+
E)  acetyl-CoAF) None of the above
G) C) and D)

Question 14

This process is common to all living cells:

Accepted Answer

A)  Glycolysis
B)  Alcohol fermentation
C)  The Citric acid cycle
D)  Electron transport chain reactions
E)  Pyruvate oxidationF) All of the above
G) None of the above

Question 15

Pyruvate oxidation in eukaryotic cells occurs in the ________.

Accepted Answer

A)  cytoplasm
B)  nucleus
C)  Golgi body
D)  mitochondria
E)  plasma membraneF) A) and C)
G) None of the above

Question 16

What is an end-product of glycolysis?

Accepted Answer

A)  Oxaloacetate
B)  NAD+
C)  Alcohol
D)  ADP
E)  PyruvateF) A) and D)
G) All of the above

Question 17

What is the net number of ATP generated directly during glycolysis per molecule of glucose?

Accepted Answer

A)  0
B)  2
C)  4
D)  6
E)  8F) A) and E)
G) B) and C) B

Question 18

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

Accepted Answer

A)  mitochondrial matrix.
B)  cytoplasm.
C)  endoplasmic reticulum.
D)  intermembrane space of the mitochondria.
E)  nucleus.F) B) and E)
G) C) and D)

Question 19

Arsenic poisoning can lead to organ failure and death.Though arsenic can inhibit or interfere with a number of cellular enzymes,arsenic poisoning is thought to be mainly due to indirect inhibition of enzymes involved in both pyruvate oxidation and the Citric acid cycle.As a result,this compound must be able to enter which cellular compartment?

Accepted Answer

A)  The cytoplasm
B)  The nucleus
C)  The intermembrane space of the mitochondria
D)  The mitochondrial matrix
E)  The endoplasmic reticulumF) B) and E)
G) A) and C)

Question 20

If ATP synthase had a mutation in the F1 complex portion of the protein,which function of ATP synthase would most likely be affected?

Accepted Answer

A)  The rotation of the rotor
B)  The flow of protons through the channel
C)  The conversion of ADP and Pi to ATP
D)  The insertion of the enzyme into the membraneE) C) and D)
F) A) and B) C

Exam 7: How Cells Harvest Energy

Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis,the Citric acid cycle and electron transport.Your best advice would be to

Correct Answer
verified

What aspect of cellular respiration occurs in the cytoplasm in eukaryotic cells?

Correct Answer
verified

Correct Answer
verified

Why is the energy generated from the catabolism of sugars and other macromolecules ultimately harnessed to generate ATP?

Correct Answer
verified

When oxygen is unavailable during heavy exercise what process do muscle cells use for energy generation?

Correct Answer
verified

Phosphofructokinase is regulated by a number of factors,including high levels of ATP.Why is this enzyme regulated by ATP levels?

Correct Answer
verified

In order to lose weight and reduce body fat,a friend of yours has decided to eliminate all fat from his diet,while consuming unrestricted amounts of carbohydrates.What do you think of this idea?

Correct Answer
verified

What stage of cellular respiration can occur in human cells with or without oxygen present?

Correct Answer
verified

What molecule can oxidize NADH?

Correct Answer
verified

Glucose is not our only food source,nor the only one we can utilize in our bodies to generate energy.Other primary sources of energy include other sugars,proteins,and fats.What metabolic intermediate are fats primarily converted into?

Correct Answer
verified

All of the reactions of cellular respiration that occur after glycolysis take place in what part of the eukaryotic cell?

Correct Answer
verified
C

Correct Answer
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What is the oxidized form of the most common electron carrier that is needed for both glycolysis and the Citric acid cycle?

Correct Answer
verified

This process is common to all living cells:

Correct Answer
verified

Pyruvate oxidation in eukaryotic cells occurs in the ________.

Correct Answer
verified

What is an end-product of glycolysis?

Correct Answer
verified

What is the net number of ATP generated directly during glycolysis per molecule of glucose?

Correct Answer
verified
B

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

Correct Answer
verified

Correct Answer
verified

If ATP synthase had a mutation in the F₁ complex portion of the protein,which function of ATP synthase would most likely be affected?

Correct Answer
verified
C

Exam 7: How Cells Harvest Energy

Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis,the Citric acid cycle and electron transport.Your best advice would be to

Correct AnswerverifiedShow Answer

What aspect of cellular respiration occurs in the cytoplasm in eukaryotic cells?

Correct AnswerverifiedShow Answer

Aerobic respiration involves the transfer of many electrons from glucose to electron carriers such as NAD+ over a series of multiple steps.Ultimately though,it is the reaction of glucose with oxygen to generate carbon dioxide,water and energy.Why doesn't glucose react directly with oxygen in cells?

Correct AnswerverifiedShow Answer

Why is the energy generated from the catabolism of sugars and other macromolecules ultimately harnessed to generate ATP?

Correct AnswerverifiedShow Answer

When oxygen is unavailable during heavy exercise what process do muscle cells use for energy generation?

Correct AnswerverifiedShow Answer

Phosphofructokinase is regulated by a number of factors,including high levels of ATP.Why is this enzyme regulated by ATP levels?

Correct AnswerverifiedShow Answer

In order to lose weight and reduce body fat,a friend of yours has decided to eliminate all fat from his diet,while consuming unrestricted amounts of carbohydrates.What do you think of this idea?

Correct AnswerverifiedShow Answer

What stage of cellular respiration can occur in human cells with or without oxygen present?

Correct AnswerverifiedShow Answer

What molecule can oxidize NADH?

Correct AnswerverifiedShow Answer

Glucose is not our only food source,nor the only one we can utilize in our bodies to generate energy.Other primary sources of energy include other sugars,proteins,and fats.What metabolic intermediate are fats primarily converted into?

Correct AnswerverifiedShow Answer

All of the reactions of cellular respiration that occur after glycolysis take place in what part of the eukaryotic cell?

Correct AnswerverifiedC

Correct AnswerverifiedShow Answer

What is the oxidized form of the most common electron carrier that is needed for both glycolysis and the Citric acid cycle?

Correct AnswerverifiedShow Answer

This process is common to all living cells:

Correct AnswerverifiedShow Answer

Pyruvate oxidation in eukaryotic cells occurs in the ________.

Correct AnswerverifiedShow Answer

What is an end-product of glycolysis?

Correct AnswerverifiedShow Answer

What is the net number of ATP generated directly during glycolysis per molecule of glucose?

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If ATP synthase had a mutation in the F1 complex portion of the protein,which function of ATP synthase would most likely be affected?

Correct AnswerverifiedC

Correct Answer
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C

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B

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Correct Answer
verified

If ATP synthase had a mutation in the F₁ complex portion of the protein,which function of ATP synthase would most likely be affected?

Correct Answer
verified
C