Question 1

Which of the following enzymes plays a role 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 2

In the molecules AMP, ADP and ATP, "A" stands for which of the following?

Accepted Answer

A)  the alkaloid atropine 
B)  the amino acid alanine 
C)  the amino acid arginine 
D)  the nucleoside adenosine 
A)  the alkaloid atropine 
B)  the amino acid alanine 
C)  the amino acid arginine 
D)  the nucleoside adenosine

Question 3

What is the approximate lifetime of an ATP molecule in a cell?

Accepted Answer

A)  1 second 
B)  1 minute 
C)  1 hour 
D)  1 day 
A)  1 second 
B)  1 minute 
C)  1 hour 
D)  1 day

Question 4

Which of the following organelles remove damaged cellular materials and foreign materials from cells?

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 5

Which of the following correctly describes the chemical reactivity of citrate and isocitrate?

Accepted Answer

A)  Both citrate and isocitrate can be oxidized. 
B)  Neither citrate nor isocitrate can be oxidized. 
C)  Citrate can be oxidized, but isocitrate cannot. 
D)  Isocitrate can be oxidized, but citrate cannot. 
A)  Both citrate and isocitrate can be oxidized. 
B)  Neither citrate nor isocitrate can be oxidized. 
C)  Citrate can be oxidized, but isocitrate cannot. 
D)  Isocitrate can be oxidized, but citrate cannot.

Question 6

Which of the following occurs when myosin hydrolyzes ATP?

Accepted Answer

A)  dissociation of the actin-myosin complex and muscle contraction 
B)  dissociation of the actin-myosin complex and muscle relaxation 
C)  formation of the actin-myosin complex and muscle contraction 
D)  formation of the actin-myosin complex and muscle relaxation 
A)  dissociation of the actin-myosin complex and muscle contraction 
B)  dissociation of the actin-myosin complex and muscle relaxation 
C)  formation of the actin-myosin complex and muscle contraction 
D)  formation of the actin-myosin complex and muscle relaxation

Question 7

Examine the following figure.  
-Consider the following structure which represents the operative part of the biologically active molecule.   Which of the following is the correct abbreviation for this compound?

Accepted Answer

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

Question 8

Examine the following figure.  
-Which numbered structure represents the location of the enzymes of oxidative phosphorylation?

Accepted Answer

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

Question 9

Of the compounds classified as carbohydrates, lipids, and proteins, which can be used by the body as fuels?

Accepted Answer

A)  only carbohydrates and lipids 
B)  only carbohydrates and proteins 
C)  only lipids and proteins 
D)  all of them 
A)  only carbohydrates and lipids 
B)  only carbohydrates and proteins 
C)  only lipids and proteins 
D)  all of them

Question 10

Which of the following is true?

Accepted Answer

A)  The [H+] in the intermembrane space and in the interior of the mitochondrion are equal. 
B)  The [H+] in the intermembrane space is always higher than that in the interior of the mitochondrion. 
C)  The [H+] in the intermembrane space is always lower than that in the interior of the mitochondrion. 
D)  The [H+] in the intermembrane space is sometimes higher and sometimes lower than that in the interior of the mitochondrion. 
A)  The [H+] in the intermembrane space and in the interior of the mitochondrion are equal. 
B)  The [H+] in the intermembrane space is always higher than that in the interior of the mitochondrion. 
C)  The [H+] in the intermembrane space is always lower than that in the interior of the mitochondrion. 
D)  The [H+] in the intermembrane space is sometimes higher and sometimes lower than that in the interior of the mitochondrion.

Question 11

How many molecules of CO2 are produced by one pass through the citric acid cycle?

Accepted Answer

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

Question 12

Which of the following occurs when protons accumulate in the matrix?

Accepted Answer

A)  proton-translocating ATPase is destroyed 
B)  proton-translocating ATPase stops all activity 
C)  proton-translocating ATPase increases the synthesis of ATP 
D)  proton-translocating ATPase catalyzes the hydrolysis of ATP 
A)  proton-translocating ATPase is destroyed 
B)  proton-translocating ATPase stops all activity 
C)  proton-translocating ATPase increases the synthesis of ATP 
D)  proton-translocating ATPase catalyzes the hydrolysis of ATP

Question 13

Which of the following is an intermediate in the conversion of citrate to isocitrate?

Accepted Answer

A)  cis-aconitate 
B)  trans-aconitate 
C)  fumarate 
D)  malate 
A)  cis-aconitate 
B)  trans-aconitate 
C)  fumarate 
D)  malate

Question 14

What type of reaction occurs when α-ketoglutarate is converted to succinate in steps 4 and 5 of the citric acid cycle?

Accepted Answer

A)  oxidative carboxylation 
B)  oxidative decarboxylation 
C)  reductive carboxylation 
D)  reductive decarboxylation 
A)  oxidative carboxylation 
B)  oxidative decarboxylation 
C)  reductive carboxylation 
D)  reductive decarboxylation

Question 15

Which sugar is found in AMP, ADP and ATP?

Accepted Answer

A)  deoxyribose 
B)  galactose 
C)  glucose 
D)  ribose 
A)  deoxyribose 
B)  galactose 
C)  glucose 
D)  ribose

Question 16

What type of reaction occurs when fumarate is converted to malate in step 7 of the citric acid cycle?

Accepted Answer

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

Question 17

Which metal is found in complex I of the electron and H+ transport chain?

Accepted Answer

A)  Ca 
B)  Co 
C)  Fe 
D)  Mg 
A)  Ca 
B)  Co 
C)  Fe 
D)  Mg

Question 18

The citric acid cycle involves how many distinct steps?

Accepted Answer

A)  4 
B)  6 
C)  8 
D)  10 
A)  4 
B)  6 
C)  8 
D)  10

Question 19

In ADP and ATP, what type of linkage connects the phosphate atoms?

Accepted Answer

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

Question 20

Metabolism is which of the following?

Accepted Answer

A)  all the processes that involve breaking down molecules into smaller fragments 
B)  all the processes that involve the synthesis of molecules 
C)  all the processes involved in both a and b above 
D)  all the processes involved in both a and b plus additional processes 
A)  all the processes that involve breaking down molecules into smaller fragments 
B)  all the processes that involve the synthesis of molecules 
C)  all the processes involved in both a and b above 
D)  all the processes involved in both a and b plus additional processes

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

Which of the following enzymes plays a role in both the citric acid cycle and the electron and H+ transport chain?

In the molecules AMP, ADP and ATP, "A" stands for which of the following?

What is the approximate lifetime of an ATP molecule in a cell?

Which of the following organelles remove damaged cellular materials and foreign materials from cells?

Which of the following correctly describes the chemical reactivity of citrate and isocitrate?

Which of the following occurs when myosin hydrolyzes ATP?

Examine the following figure. -Consider the following structure which represents the operative part of the biologically active molecule. Which of the following is the correct abbreviation for this compound?

Examine the following figure. -Which numbered structure represents the location of the enzymes of oxidative phosphorylation?

Of the compounds classified as carbohydrates, lipids, and proteins, which can be used by the body as fuels?

Which of the following is true?

How many molecules of CO2 are produced by one pass through the citric acid cycle?

Which of the following occurs when protons accumulate in the matrix?

Which of the following is an intermediate in the conversion of citrate to isocitrate?

What type of reaction occurs when α-ketoglutarate is converted to succinate in steps 4 and 5 of the citric acid cycle?

Which sugar is found in AMP, ADP and ATP?

What type of reaction occurs when fumarate is converted to malate in step 7 of the citric acid cycle?

Which metal is found in complex I of the electron and H+ transport chain?

The citric acid cycle involves how many distinct steps?

In ADP and ATP, what type of linkage connects the phosphate atoms?

Metabolism is which of the following?

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 enzymes plays a role in both the citric acid cycle and the electron and H⁺ transport chain?

How many molecules of CO₂ are produced by one pass through the citric acid cycle?

Which metal is found in complex I of the electron and H⁺ transport chain?