Question 1

Which of the following coenzymes helps oxidize isocitrate to oxalosuccinate?

Accepted Answer

A)  FADH2 
B)  NAD+ 
C)  NADH 
D)  FAD 
A)  FADH2 
B)  NAD+ 
C)  NADH 
D)  FAD

Question 2

How many molecules of NADH are produced at the end of the citric acid cycle?

Accepted Answer

A)  zero 
B)  one 
C)  two 
D)  three 
A)  zero 
B)  one 
C)  two 
D)  three

Question 3

What is the minimum number of protons required for the overall oxidation process to occur in the electron transport chain?

Accepted Answer

A)  one 
B)  two 
C)  four 
D)  eight 
A)  one 
B)  two 
C)  four 
D)  eight

Question 4

Which statement best compares the reactions of citrate and isocitrate in the citric acid cycle?

Accepted Answer

A)  Both citrate and isocitrate are oxidized in the citric acid cycle. 
B)  Neither citrate nor isocitrate is oxidized in the citric acid cycle. 
C)  Citrate is oxidized, whereas isocitrate is not oxidized in the citric acid cycle. 
D)  Isocitrate is oxidized, whereas citrate is not oxidized in the citric acid cycle. 
A)  Both citrate and isocitrate are oxidized in the citric acid cycle. 
B)  Neither citrate nor isocitrate is oxidized in the citric acid cycle. 
C)  Citrate is oxidized, whereas isocitrate is not oxidized in the citric acid cycle. 
D)  Isocitrate is oxidized, whereas citrate is not oxidized in the citric acid cycle.

Question 5

Which of the following statements is true of metabolism?

Accepted Answer

A)  It is the sum of all the processes involved in the breaking down of complex biomolecules. 
B)  It is the sum of all the processes involved in the synthesis of biomolecules. 
C)  It is the sum of all the processes involved in the breaking down of complex biomolecules and in the synthesis of biomolecules. 
D)  None of these 
A)  It is the sum of all the processes involved in the breaking down of complex biomolecules. 
B)  It is the sum of all the processes involved in the synthesis of biomolecules. 
C)  It is the sum of all the processes involved in the breaking down of complex biomolecules and in the synthesis of biomolecules. 
D)  None of these

Question 6

Identify an example that involves the conversion of chemical energy to electrical energy.

Accepted Answer

A)  the phosphorylation of serine to activate the enzyme PFK-2 
B)  the pumping of ions across cell membranes 
C)  the contraction and relaxation of muscles under stress 
D)  the hydrolysis of biomolecules to maintain body temperature 
A)  the phosphorylation of serine to activate the enzyme PFK-2 
B)  the pumping of ions across cell membranes 
C)  the contraction and relaxation of muscles under stress 
D)  the hydrolysis of biomolecules to maintain body temperature

Question 7

Which of the following compounds is an intermediate formed during the conversion of isocitrate to α-ketoglutarate?

Accepted Answer

A)  fumarate 
B)  oxaloacetate 
C)  oxalosuccinate 
D)  succinate 
A)  fumarate 
B)  oxaloacetate 
C)  oxalosuccinate 
D)  succinate

Question 8

Which of the following statements is correct with respect to the flow of protons between the intermembrane space and the matrix?

Accepted Answer

A)  Protons flow spontaneously directly through the lipid bilayer from the intermembrane space to the matrix. 
B)  Protons flow spontaneously directly through the lipid bilayer from the matrix to the intermembrane space. 
C)  Protons flow spontaneously through a channel in the lipid bilayer from the intermembrane space to the matrix. 
D)  Protons flow spontaneously through a channel in the lipid bilayer from the matrix to the intermembrane space. 
A)  Protons flow spontaneously directly through the lipid bilayer from the intermembrane space to the matrix. 
B)  Protons flow spontaneously directly through the lipid bilayer from the matrix to the intermembrane space. 
C)  Protons flow spontaneously through a channel in the lipid bilayer from the intermembrane space to the matrix. 
D)  Protons flow spontaneously through a channel in the lipid bilayer from the matrix to the intermembrane space.

Question 9

In the citric acid cycle, which of the following reactions occurs during the conversion of fumarate to malate?

Accepted Answer

A)  dehydration 
B)  hydration 
C)  oxidation 
D)  reduction 
A)  dehydration 
B)  hydration 
C)  oxidation 
D)  reduction

Question 10

Identify the molecules that contain high-energy phosphoric anhydride bonds.

Accepted Answer

A)  both ADP and AMP 
B)  both ADP and ATP 
C)  both AMP and ATP 
D)  all of these 
A)  both ADP and AMP 
B)  both ADP and ATP 
C)  both AMP and ATP 
D)  all of these

Question 11

What is the symbolic representation of ubiquinone?

Accepted Answer

A)  FeS 
B)  CoA 
C)  CoQ 
D)  FAD 
A)  FeS 
B)  CoA 
C)  CoQ 
D)  FAD

Question 12

What is the role of oxygen in the electron and H+ transport chain?

Accepted Answer

A)  It converts NADH and FADH2 to NAD+ and FAD, respectively. 
B)  It provides energy for the conversion of ADP to ATP. 
C)  Both of these are roles of oxygen in the electron and H+ transport chain. 
D)  Neither of these is a role of oxygen in the electron and H+ transport chain. 
A)  It converts NADH and FADH2 to NAD+ and FAD, respectively. 
B)  It provides energy for the conversion of ADP to ATP. 
C)  Both of these are roles of oxygen in the electron and H+ transport chain. 
D)  Neither of these is a role of oxygen in the electron and H+ transport chain.

Question 13

In AMP, ADP, and ATP, which carbon of the ribose sugar is bonded to the adenine molecule?

Accepted Answer

A)  carbon 1 
B)  carbon 2 
C)  carbon 3 
D)  carbon 5 
A)  carbon 1 
B)  carbon 2 
C)  carbon 3 
D)  carbon 5

Question 14

Which types of metabolic reactions are involved in the synthesis of molecules?

Accepted Answer

A)  anabolic reactions 
B)  catabolic reactions 
C)  anabolic and catabolic reactions 
D)  none of these 
A)  anabolic reactions 
B)  catabolic reactions 
C)  anabolic and catabolic reactions 
D)  none of these

Question 15

What happens when myosin filaments hydrolyze ATP molecules in muscles?

Accepted Answer

A)  Actin-myosin complexes dissociate, leading to muscle contraction. 
B)  Actin-myosin complexes dissociate, leading to muscle relaxation. 
C)  Actin-myosin complexes are formed, leading to muscle contraction. 
D)  Actin-myosin complexes are formed, leading to muscle relaxation. 
A)  Actin-myosin complexes dissociate, leading to muscle contraction. 
B)  Actin-myosin complexes dissociate, leading to muscle relaxation. 
C)  Actin-myosin complexes are formed, leading to muscle contraction. 
D)  Actin-myosin complexes are formed, leading to muscle relaxation.

Question 16

Which of the following adenine-containing compounds is shown here?

Accepted Answer

A)  ATP 
B)  ADP 
C)  AMP 
D)  cyclic AMP 
A)  ATP 
B)  ADP 
C)  AMP 
D)  cyclic AMP

Question 17

Which type of linkage is present between any two phosphate groups in ATP?

Accepted Answer

A)  an anhydride linkage 
B)  an ester linkage 
C)  an ether linkage 
D)  none of these 
A)  an anhydride linkage 
B)  an ester linkage 
C)  an ether linkage 
D)  none of these

Question 18

How many molecules of FADH2 are produced at the end of the citric acid cycle?

Accepted Answer

A)  zero 
B)  one 
C)  two 
D)  three 
A)  zero 
B)  one 
C)  two 
D)  three

Question 19

How many electrons can be transported by a molecule of cytochrome c?

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four 
A)  one 
B)  two 
C)  three 
D)  four

Question 20

Which of the following coenzymes helps oxidize malate to oxaloacetate?

Accepted Answer

A)  FAD 
B)  FADH2 
C)  NAD+ 
D)  NADH 
A)  FAD 
B)  FADH2 
C)  NAD+ 
D)  NADH

Exam 26: Bioenergetics: How the Body Converts Food to Energy

Which of the following coenzymes helps oxidize isocitrate to oxalosuccinate?

How many molecules of NADH are produced at the end of the citric acid cycle?

What is the minimum number of protons required for the overall oxidation process to occur in the electron transport chain?

Which statement best compares the reactions of citrate and isocitrate in the citric acid cycle?

Which of the following statements is true of metabolism?

Identify an example that involves the conversion of chemical energy to electrical energy.

Which of the following compounds is an intermediate formed during the conversion of isocitrate to α-ketoglutarate?

Which of the following statements is correct with respect to the flow of protons between the intermembrane space and the matrix?

In the citric acid cycle, which of the following reactions occurs during the conversion of fumarate to malate?

Identify the molecules that contain high-energy phosphoric anhydride bonds.

What is the symbolic representation of ubiquinone?

What is the role of oxygen in the electron and H+ transport chain?

In AMP, ADP, and ATP, which carbon of the ribose sugar is bonded to the adenine molecule?

Which types of metabolic reactions are involved in the synthesis of molecules?

What happens when myosin filaments hydrolyze ATP molecules in muscles?

Which of the following adenine-containing compounds is shown here?

Which type of linkage is present between any two phosphate groups in ATP?

How many molecules of FADH2 are produced at the end of the citric acid cycle?

How many electrons can be transported by a molecule of cytochrome c?

Which of the following coenzymes helps oxidize malate to oxaloacetate?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Chemical Reactions

Gases, Liquids, and Solids

Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Biosynthetic Pathways

Nutrition

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Body Fluids

Filters

What is the role of oxygen in the electron and H⁺ transport chain?

How many molecules of FADH₂ are produced at the end of the citric acid cycle?