Question 1

Which of the following pathways converge to a common catabolic pathway?

Accepted Answer

A)  only the pathways for the catabolism of carbohydrates and lipids 
B)  only the pathways for the catabolism of carbohydrates and proteins 
C)  only the pathways for the catabolism of lipids and proteins 
D)  the pathways for the catabolism of proteins, carbohydrates, and lipids 
A)  only the pathways for the catabolism of carbohydrates and lipids 
B)  only the pathways for the catabolism of carbohydrates and proteins 
C)  only the pathways for the catabolism of lipids and proteins 
D)  the pathways for the catabolism of proteins, carbohydrates, and lipids

Question 2

Where in the mitochondrion is the proton-translocating ATPase located?

Accepted Answer

A)  in the intermembrane space 
B)  in the matrix 
C)  on the inner membrane 
D)  on the outer membrane 
A)  in the intermembrane space 
B)  in the matrix 
C)  on the inner membrane 
D)  on the outer membrane

Question 3

During step 1 of the citric acid cycle, which of the following reactions occurs during the conversion of citryl CoA to citrate?

Accepted Answer

A)  hydrolysis 
B)  ionization 
C)  reduction 
D)  oxidation 
A)  hydrolysis 
B)  ionization 
C)  reduction 
D)  oxidation

Question 4

Examine the given diagram of a cell organelle. Which numbered structure in the given diagram has the enzymes of the citric acid cycle?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 5

Which of the following is an active part of coenzyme A?

Accepted Answer

A)  acetyl group 
B)  pantothenic acid 
C)  mercaptoethylamine 
D)  adenosine 
A)  acetyl group 
B)  pantothenic acid 
C)  mercaptoethylamine 
D)  adenosine

Question 6

Which of the following statements correctly describes the distribution of K+ and Na+ ions?

Accepted Answer

A)  [K+] is low both inside and outside the cells; however, [Na+] is high both inside and outside the cells. 
B)  [K+] is high both inside and outside the cells; however, [Na+] is low both inside and outside the cells. 
C)  [K+] is high inside the cells and low outside the cells; however, the reverse is true for [Na+]. 
D)  [K+] is low inside the cells and high outside the cells; however, the reverse is true for [Na+]. 
A)  [K+] is low both inside and outside the cells; however, [Na+] is high both inside and outside the cells. 
B)  [K+] is high both inside and outside the cells; however, [Na+] is low both inside and outside the cells. 
C)  [K+] is high inside the cells and low outside the cells; however, the reverse is true for [Na+]. 
D)  [K+] is low inside the cells and high outside the cells; however, the reverse is true for [Na+].

Question 7

Which of the following metabolic pathways involves the transport of electron and H+ ions and the subsequent synthesis of ATP molecules?

Accepted Answer

A)  the oxidative phosphorylation pathway 
B)  the citric acid cycle 
C)  the oxidative phosphorylation pathway and the citric acid cycle 
D)  none of these 
A)  the oxidative phosphorylation pathway 
B)  the citric acid cycle 
C)  the oxidative phosphorylation pathway and the citric acid cycle 
D)  none of these

Question 8

Which of the following statements is true of both actin and myosin?

Accepted Answer

A)  Both actin and myosin are thick filaments. 
B)  Both actin and myosin are thin filaments. 
C)  Actin is a thick filament, whereas myosin is a thin filament. 
D)  Actin is a thin filament, whereas myosin is a thick filament. 
A)  Both actin and myosin are thick filaments. 
B)  Both actin and myosin are thin filaments. 
C)  Actin is a thick filament, whereas myosin is a thin filament. 
D)  Actin is a thin filament, whereas myosin is a thick filament.

Question 9

Which of the following cytochromes transfers electrons to an oxygen molecule?

Accepted Answer

A)  cytochrome a 
B)  cytochrome a3 
C)  cytochrome b 
D)  cytochrome c 
A)  cytochrome a 
B)  cytochrome a3 
C)  cytochrome b 
D)  cytochrome c

Question 10

Which of the following is the starting compound of the citric acid cycle?

Accepted Answer

A)  acetyl CoA 
B)  oxaloacetate 
C)  isocitrate 
D)  succinyl CoA 
A)  acetyl CoA 
B)  oxaloacetate 
C)  isocitrate 
D)  succinyl CoA

Question 11

Which of the following ion channels is present in the F0 sector of a proton-translocating ATPase?

Accepted Answer

A)  a chloride channel 
B)  an electron channel 
C)  a proton channel 
D)  a calcium channel 
A)  a chloride channel 
B)  an electron channel 
C)  a proton channel 
D)  a calcium channel

Question 12

In AMP, ADP, and ATP, which carbon of the ribose sugar is bonded to a phosphate group?

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 13

Which of the following enzymes is present in both the citric acid cycle and the electron and H+ transport chain?

Accepted Answer

A)  aconitase 
B)  isocitrate dehydrogenase 
C)  malate dehydrogenase 
D)  succinate dehydrogenase 
A)  aconitase 
B)  isocitrate dehydrogenase 
C)  malate dehydrogenase 
D)  succinate dehydrogenase

Question 14

Which of the following coenzymes inhibit the enzymes of the citric acid cycle when they accumulate in excess?

Accepted Answer

A)  ATP and NADH + H+ 
B)  ADP and NAD+ 
C)  FADH2 and NAD+ 
D)  none of these 
A)  ATP and NADH + H+ 
B)  ADP and NAD+ 
C)  FADH2 and NAD+ 
D)  none of these

Question 15

In which direction do protons move in the F0 sector of a proton-translocating ATPase?

Accepted Answer

A)  from the intermembrane space to the matrix of a mitochondrion 
B)  from the matrix to the intermembrane space of a mitochondrion 
C)  from the inner membrane to the outer membrane of a mitochondrion 
D)  from the outer membrane to the inner membrane of a mitochondrion 
A)  from the intermembrane space to the matrix of a mitochondrion 
B)  from the matrix to the intermembrane space of a mitochondrion 
C)  from the inner membrane to the outer membrane of a mitochondrion 
D)  from the outer membrane to the inner membrane of a mitochondrion

Question 16

Which of the following linkages does pantothenic acid form in a CoA molecule?

Accepted Answer

A)  an ester linkage with diphosphate and an amide linkage with ethylamine 
B)  an ester linkage with diphosphate and an amide linkage with diethylamine 
C)  an ester linkage with diphosphate and an amide linkage with mercaptoethylamine 
D)  an ester linkage with diphosphate and an amide linkage with a tertiary amine 
A)  an ester linkage with diphosphate and an amide linkage with ethylamine 
B)  an ester linkage with diphosphate and an amide linkage with diethylamine 
C)  an ester linkage with diphosphate and an amide linkage with mercaptoethylamine 
D)  an ester linkage with diphosphate and an amide linkage with a tertiary amine

Question 17

Which of the following coenzymes provides H+ and electrons that combine with oxygen to form water molecules?

Accepted Answer

A)  only FADH2 
B)  only NADH 
C)  both FADH2 and NADH 
D)  neither FADH2 nor NADH 
A)  only FADH2 
B)  only NADH 
C)  both FADH2 and NADH 
D)  neither FADH2 nor NADH

Question 18

Which is the operative part of the coenzyme FAD?

Accepted Answer

A)  ribitol 
B)  ribose sugar 
C)  flavin 
D)  phosphate group 
A)  ribitol 
B)  ribose sugar 
C)  flavin 
D)  phosphate group

Question 19

Which of the following statements is true of anabolic reactions?

Accepted Answer

A)  They provide the energy needed by cells. 
B)  They synthesize the compounds needed by cells. 
C)  They provide the energy needed by cells and they synthesize the compounds needed by cells. 
D)  None of these 
A)  They provide the energy needed by cells. 
B)  They synthesize the compounds needed by cells. 
C)  They provide the energy needed by cells and they synthesize the compounds needed by cells. 
D)  None of these

Question 20

Which of the following sets of reagents is required for the conversion of α-ketoglutarate to succinate in steps 4 and 5 of the citric acid cycle?

Accepted Answer

A)  NAD+, GDP, and inorganic phosphate 
B)  NAD+, GTP, inorganic phosphate, and water 
C)  NAD+, GTP, and inorganic phosphate 
D)  NAD+, GDP, inorganic phosphate, and water 
A)  NAD+, GDP, and inorganic phosphate 
B)  NAD+, GTP, inorganic phosphate, and water 
C)  NAD+, GTP, and inorganic phosphate 
D)  NAD+, GDP, inorganic phosphate, and water

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

Which of the following pathways converge to a common catabolic pathway?

Where in the mitochondrion is the proton-translocating ATPase located?

During step 1 of the citric acid cycle, which of the following reactions occurs during the conversion of citryl CoA to citrate?

Examine the given diagram of a cell organelle. Which numbered structure in the given diagram has the enzymes of the citric acid cycle?

Which of the following is an active part of coenzyme A?

Which of the following statements correctly describes the distribution of K+ and Na+ ions?

Which of the following metabolic pathways involves the transport of electron and H+ ions and the subsequent synthesis of ATP molecules?

Which of the following statements is true of both actin and myosin?

Which of the following cytochromes transfers electrons to an oxygen molecule?

Which of the following is the starting compound of the citric acid cycle?

Which of the following ion channels is present in the F0 sector of a proton-translocating ATPase?

In AMP, ADP, and ATP, which carbon of the ribose sugar is bonded to a phosphate group?

Which of the following enzymes is present in both the citric acid cycle and the electron and H+ transport chain?

Which of the following coenzymes inhibit the enzymes of the citric acid cycle when they accumulate in excess?

In which direction do protons move in the F0 sector of a proton-translocating ATPase?

Which of the following linkages does pantothenic acid form in a CoA molecule?

Which of the following coenzymes provides H+ and electrons that combine with oxygen to form water molecules?

Which is the operative part of the coenzyme FAD?

Which of the following statements is true of anabolic reactions?

Which of the following sets of reagents is required for the conversion of α-ketoglutarate to succinate in steps 4 and 5 of the citric acid cycle?

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

Immunochemistry

Body Fluids

Filters

Which of the following statements correctly describes the distribution of K⁺ and Na⁺ ions?

Which of the following metabolic pathways involves the transport of electron and H⁺ ions and the subsequent synthesis of ATP molecules?

Which of the following ion channels is present in the F₀ sector of a proton-translocating ATPase?

Which of the following enzymes is present in both the citric acid cycle and the electron and H⁺ transport chain?

In which direction do protons move in the F₀ sector of a proton-translocating ATPase?

Which of the following coenzymes provides H⁺ and electrons that combine with oxygen to form water molecules?