Question 1

Examine the following figure.  
-Which of the choices is a correct designation for the compound shown below?

Accepted Answer

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

Question 2

Examine the following figure.  
-Which numbered structure represents the matrix?

Accepted Answer

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

Question 3

The formation of citrate ion in step 1 of the citric acid cycle involves the reaction of acetyl CoA with which of the following?

Accepted Answer

A)  isocitrate 
B)  oxaloacetate 
C)  fumarate 
D)  malate 
A)  isocitrate 
B)  oxaloacetate 
C)  fumarate 
D)  malate

Question 4

How do compounds such as 2,4-dinitrophenol, DNP, work as weight reducing drugs?

Accepted Answer

A)  They prevent normal digestion of food. 
B)  They disrupt the chemiosmotic pump by transporting protons from the intermembrane space to the matrix directly through the lipid bilayer. 
C)  They disrupt the chemiosmotic pump by transporting protons from the matrix to the intermembrane space directly through the lipid bilayer. 
D)  None of the above is correct. 
A)  They prevent normal digestion of food. 
B)  They disrupt the chemiosmotic pump by transporting protons from the intermembrane space to the matrix directly through the lipid bilayer. 
C)  They disrupt the chemiosmotic pump by transporting protons from the matrix to the intermembrane space directly through the lipid bilayer. 
D)  None of the above is correct.

Question 5

Which of the following is the source of the carbon atom in the CO2 produced when oxalosuccinate is converted to α-ketoglutarate in step 3 of the citric acid cycle?

Accepted Answer

A)  acetyl CoA 
B)  the original oxaloacetate 
C)  succinate 
D)  none of these 
A)  acetyl CoA 
B)  the original oxaloacetate 
C)  succinate 
D)  none of these

Question 6

Which metal is found in cytochrome a3?

Accepted Answer

A)  Co 
B)  Cu 
C)  Mg 
D)  none of these 
A)  Co 
B)  Cu 
C)  Mg 
D)  none of these

Question 7

Which portion of proton-translocating ATPase is embedded in the membrane?

Accepted Answer

A)  α 
B)  β 
C)  F0 
D)  F1 
A)  α 
B)  β 
C)  F0 
D)  F1

Question 8

Which of the following is the oxidizing agent in the reaction which converts isocitrate to oxalosuccinate?

Accepted Answer

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

Question 9

The conversion of citrate to isocitrate in step 2 of the citric acid cycle involves which of the following sequences of reactions?

Accepted Answer

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

Question 10

Which of the following is true of the FAD/FADH2 system?

Accepted Answer

A)  FAD is the oxidized form and FADH2 is the reduced form. 
B)  FAD is the reduced form and FADH2 is the oxidized form. 
C)  The conversion of FAD to FADH2 is an addition reaction. 
D)  The conversion of FAD to FADH2 is a condensation reaction. 
A)  FAD is the oxidized form and FADH2 is the reduced form. 
B)  FAD is the reduced form and FADH2 is the oxidized form. 
C)  The conversion of FAD to FADH2 is an addition reaction. 
D)  The conversion of FAD to FADH2 is a condensation reaction.

Question 11

The H+ and electrons which combine with the oxygen we breathe to form water are provided by which of the following?

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 12

Which of the following is true when H+ and O2 combine to produce two molecules of water?

Accepted Answer

A)  Two electrons are consumed and the reaction is endothermic. 
B)  Two electrons are consumed and the reaction is exothermic. 
C)  Four electrons are consumed and the reaction is endothermic. 
D)  Four electrons are consumed and the reaction is exothermic. 
A)  Two electrons are consumed and the reaction is endothermic. 
B)  Two electrons are consumed and the reaction is exothermic. 
C)  Four electrons are consumed and the reaction is endothermic. 
D)  Four electrons are consumed and the reaction is exothermic.

Question 13

Oxidative phosphorylation results in the production of how many molecules of ATP for each NADH consumed?

Accepted Answer

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

Question 14

Which of the following won a Nobel Prize for proposing the chemiosmotic theory?

Accepted Answer

A)  C. Anfinsen 
B)  B. Blumberg 
C)  P. Mitchell 
D)  R. Yalow 
A)  C. Anfinsen 
B)  B. Blumberg 
C)  P. Mitchell 
D)  R. Yalow

Question 15

In which of the following organelles does the common catabolic pathway take place in higher organisms?

Accepted Answer

A)  Golgi bodies 
B)  lysosomes 
C)  mitochondria 
D)  smooth endoplasmic reticulum 
A)  Golgi bodies 
B)  lysosomes 
C)  mitochondria 
D)  smooth endoplasmic reticulum

Question 16

Which of the following correctly describes 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 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 matrix to the intermembrane space.

Question 17

The hydrolysis of ATP to provide energy to maintain proper ion concentrations inside and outside the cells is an example of which of the following?

Accepted Answer

A)  conversion of one form of chemical energy to another 
B)  conversion of chemical energy to electrical energy 
C)  conversion of chemical energy to heat energy 
D)  conversion of one form of chemical energy to mechanical energy 
A)  conversion of one form of chemical energy to another 
B)  conversion of chemical energy to electrical energy 
C)  conversion of chemical energy to heat energy 
D)  conversion of one form of chemical energy to mechanical energy

Question 18

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

Accepted Answer

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

Question 19

The citric acid cycle is inhibited by the accumulation of which of the following?

Accepted Answer

A)  ATP and/or NADH + H+ 
B)  ADP and/or NAD+ 
C)  acetyl CoA 
D)  none of these 
A)  ATP and/or NADH + H+ 
B)  ADP and/or NAD+ 
C)  acetyl CoA 
D)  none of these

Question 20

Examine the following figure.  
-Which numbered structure represents a membrane that is permeable to ions and small molecules without the aid of transporting proteins?

Accepted Answer

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

Exam 27: Bioenergetics: How the Body Converts Food to Energy

Examine the following figure. -Which of the choices is a correct designation for the compound shown below?

Examine the following figure. -Which numbered structure represents the matrix?

The formation of citrate ion in step 1 of the citric acid cycle involves the reaction of acetyl CoA with which of the following?

How do compounds such as 2,4-dinitrophenol, DNP, work as weight reducing drugs?

Which of the following is the source of the carbon atom in the CO2 produced when oxalosuccinate is converted to α-ketoglutarate in step 3 of the citric acid cycle?

Which metal is found in cytochrome a3?

Which portion of proton-translocating ATPase is embedded in the membrane?

Which of the following is the oxidizing agent in the reaction which converts isocitrate to oxalosuccinate?

The conversion of citrate to isocitrate in step 2 of the citric acid cycle involves which of the following sequences of reactions?

Which of the following is true of the FAD/FADH2 system?

The H+ and electrons which combine with the oxygen we breathe to form water are provided by which of the following?

Which of the following is true when H+ and O2 combine to produce two molecules of water?

Oxidative phosphorylation results in the production of how many molecules of ATP for each NADH consumed?

Which of the following won a Nobel Prize for proposing the chemiosmotic theory?

In which of the following organelles does the common catabolic pathway take place in higher organisms?

Which of the following correctly describes the flow of protons between the intermembrane space and the matrix?

The hydrolysis of ATP to provide energy to maintain proper ion concentrations inside and outside the cells is an example of which of the following?

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

The citric acid cycle is inhibited by the accumulation of which of the following?

Examine the following figure. -Which numbered structure represents a membrane that is permeable to ions and small molecules without the aid of transporting proteins?

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 and Alkynes

Benzene and Its Derivatives

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 is the source of the carbon atom in the CO₂ produced when oxalosuccinate is converted to α-ketoglutarate in step 3 of the citric acid cycle?

Which metal is found in cytochrome a₃?

Which of the following is true of the FAD/FADH₂ system?

The H⁺ and electrons which combine with the oxygen we breathe to form water are provided by which of the following?

Which of the following is true when H⁺ and O₂ combine to produce two molecules of water?