Question 1

Which enzyme catalyzes reaction the reaction shown?

Accepted Answer

A)  enolase 
B)  pyruvate dehydrogenase 
C)  pyruvate kinase 
D)  phosphoglycerate mutase 
A)  enolase 
B)  pyruvate dehydrogenase 
C)  pyruvate kinase 
D)  phosphoglycerate mutase

Question 2

In aerobic metabolism,what is the fate of pyruvate produced by glycolysis?

Accepted Answer

A)  Pyruvate loses carbon dioxide, and the remaining two carbon atoms become linked to coenzyme A 
B)  Pyruvate loses carbon dioxide, producing acetaldehyde, which, in turn, is reduced to ethanol. 
C)  Pyruvate is reduced to lactate. 
D)  None of these 
A)  Pyruvate loses carbon dioxide, and the remaining two carbon atoms become linked to coenzyme A 
B)  Pyruvate loses carbon dioxide, producing acetaldehyde, which, in turn, is reduced to ethanol. 
C)  Pyruvate is reduced to lactate. 
D)  None of these

Question 3

Alcohol dehydrogenase resembles lactate dehydrogenase in that it

Accepted Answer

A)  is nonallosteric. 
B)  is a dimer. 
C)  uses NAD+ as a coenzyme. 
D)  is not found in aerobic organisms. 
A)  is nonallosteric. 
B)  is a dimer. 
C)  uses NAD+ as a coenzyme. 
D)  is not found in aerobic organisms.

Question 4

Which of the following is not true?

Accepted Answer

A)  Corn is the only source of biofuels 
B)  Biofuels are related to glycolysis because fermentation is an end process of anaerobic glycolysis 
C)  Corn, wood, animal dung, and many other products can produce biofuels 
D)  Many carbohydrate sources can produce ethanol 
A)  Corn is the only source of biofuels 
B)  Biofuels are related to glycolysis because fermentation is an end process of anaerobic glycolysis 
C)  Corn, wood, animal dung, and many other products can produce biofuels 
D)  Many carbohydrate sources can produce ethanol

Question 5

What kind of enzyme catalyzes the reaction shown?

Accepted Answer

A)  an epimerase 
B)  an isomerase 
C)  a mutase 
D)  a dehydrogenase 
A)  an epimerase 
B)  an isomerase 
C)  a mutase 
D)  a dehydrogenase

Question 6

The reaction of fructose 1,6-bisphosphate to give glyceraldehyde-3-phosphate and dihydroxyacetone phosphate is an example of

Accepted Answer

A)  a reverse aldol condensation. 
B)  hydrolysis. 
C)  oxidation. 
D)  dehydration. 
A)  a reverse aldol condensation. 
B)  hydrolysis. 
C)  oxidation. 
D)  dehydration.

Question 7

The nicotinamide-binding region in glyceraldehyde-3-phosphate dehydrogenase is similar to all other NAD binding domains.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following glycolytic enzymes forms a mixed anhydride from phosphoric acid?

Accepted Answer

A)  hexokinase. 
B)  phosphofructokinase. 
C)  glyceraldehyde-3-phosphate dehydrogenase. 
D)  phosphoglycerate kinase. 
E)  pyruvate kinase. 
A)  hexokinase. 
B)  phosphofructokinase. 
C)  glyceraldehyde-3-phosphate dehydrogenase. 
D)  phosphoglycerate kinase. 
E)  pyruvate kinase.

Question 9

Enolase catalyzes

Accepted Answer

A)  the cleavage of fructose bisphosphate into two 3-carbon units. 
B)  the dehydration of 2-phosphoglycerate. 
C)  the conversion of phosphoenolpyruvate to pyruvate. 
D)  the conversion of glucose-6-phosphate to fructose-6-phosphate. 
A)  the cleavage of fructose bisphosphate into two 3-carbon units. 
B)  the dehydration of 2-phosphoglycerate. 
C)  the conversion of phosphoenolpyruvate to pyruvate. 
D)  the conversion of glucose-6-phosphate to fructose-6-phosphate.

Question 10

The enzyme glucokinase

Accepted Answer

A)  phosphorylates a number of different sugars, including glucose, fructose, and mannose. 
B)  specifically phosphorylates glucose rather than other sugars. 
C)  is the only kinase involved in glycolysis. 
D)  none of the above. 
A)  phosphorylates a number of different sugars, including glucose, fructose, and mannose. 
B)  specifically phosphorylates glucose rather than other sugars. 
C)  is the only kinase involved in glycolysis. 
D)  none of the above.

Question 11

Which of the following enzymes interconverts an aldose and a ketose?

Accepted Answer

A)  kinase 
B)  isomerase 
C)  mutase 
D)  dehydrogenase 
E)  phosphorylase 
A)  kinase 
B)  isomerase 
C)  mutase 
D)  dehydrogenase 
E)  phosphorylase

Question 12

Anaerobic metabolism can occur in all these organisms or cells,except:

Accepted Answer

A)  Yeast 
B)  Red blood cells 
C)  Muscle tissue that is working very fast 
D)  Lactobacillus in milk 
E)  Anaerobic metabolism can occur in all of these. 
A)  Yeast 
B)  Red blood cells 
C)  Muscle tissue that is working very fast 
D)  Lactobacillus in milk 
E)  Anaerobic metabolism can occur in all of these.

Question 13

The fate of pyruvate produced during glycolysis depends primarily on the availability of

Accepted Answer

A)  NAD+ to keep the pathway going. 
B)  molecular oxygen. 
C)  ADP for conversion to ATP. 
D)  coenzyme A for further metabolism of pyruvate. 
E)  phosphoric acid for the synthesis of ATP. 
A)  NAD+ to keep the pathway going. 
B)  molecular oxygen. 
C)  ADP for conversion to ATP. 
D)  coenzyme A for further metabolism of pyruvate. 
E)  phosphoric acid for the synthesis of ATP.

Question 14

Which of the following enzymes relies on thiamine pyrophosphate as a cofactor?

Accepted Answer

A)  pyruvate decarboxylase 
B)  pyruvate kinase 
C)  lactate dehydrogenase 
D)  enolase 
A)  pyruvate decarboxylase 
B)  pyruvate kinase 
C)  lactate dehydrogenase 
D)  enolase

Question 15

Which of the following enzymes of anaerobic metabolism is not tetrameric?

Accepted Answer

A)  Hexokinase 
B)  Phosphofructokinase 
C)  Pyruvate kinase 
D)  Lactate Dehydrogenase 
A)  Hexokinase 
B)  Phosphofructokinase 
C)  Pyruvate kinase 
D)  Lactate Dehydrogenase

Question 16

The equilibrium for isomerization of dihydroxyacetone phosphate to glyceraldehyde-3-phosphate is favored because

Accepted Answer

A)  the standard free energy is negative 
B)  glyceraldehyde-3-phosphate is being continuously drained off for the subsequent reaction in the glycolytic pathway 
C)  the value of the equilibrium constant favors the reaction 
D)  it is driven by the hydrolysis of ATP 
A)  the standard free energy is negative 
B)  glyceraldehyde-3-phosphate is being continuously drained off for the subsequent reaction in the glycolytic pathway 
C)  the value of the equilibrium constant favors the reaction 
D)  it is driven by the hydrolysis of ATP

Question 17

The DG values for glycolytic reactions at physiological conditions may be exergonic,even though the DG°' at "standard" conditions,may be endergonic.

Accepted Answer

A) True 
 B)False

Question 18

The isomerization of dihydroxyacetone phosphate to give glyceraldehyde 3-phosphate

Accepted Answer

A)  is catalyzed by the enzyme triose phosphate isomerase. 
B)  requires several enzymes. 
C)  requires coenzyme A. 
D)  requires thiamine pyrophosphate. 
A)  is catalyzed by the enzyme triose phosphate isomerase. 
B)  requires several enzymes. 
C)  requires coenzyme A. 
D)  requires thiamine pyrophosphate.

Question 19

Which of the following enzymes forms a thioester using a cysteine residue as a key intermediate?

Accepted Answer

A)  hexokinase 
B)  triose phosphate isomerase 
C)  glyceraldehyde-3-phosphate dehydrogenase 
D)  enolase 
A)  hexokinase 
B)  triose phosphate isomerase 
C)  glyceraldehyde-3-phosphate dehydrogenase 
D)  enolase

Question 20

Which of the following is not an end product of glucose metabolism via either aerobic or anaerobic means?

Accepted Answer

A)  ethanol 
B)  carbon dioxide 
C)  lactate 
D)  fructose 
E)  all of these are end products of glucose metabolism 
A)  ethanol 
B)  carbon dioxide 
C)  lactate 
D)  fructose 
E)  all of these are end products of glucose metabolism

Exam 17: Glycolysis

Which enzyme catalyzes reaction the reaction shown?

In aerobic metabolism,what is the fate of pyruvate produced by glycolysis?

Alcohol dehydrogenase resembles lactate dehydrogenase in that it

Which of the following is not true?

What kind of enzyme catalyzes the reaction shown?

The reaction of fructose 1,6-bisphosphate to give glyceraldehyde-3-phosphate and dihydroxyacetone phosphate is an example of

The nicotinamide-binding region in glyceraldehyde-3-phosphate dehydrogenase is similar to all other NAD binding domains.

Which of the following glycolytic enzymes forms a mixed anhydride from phosphoric acid?

Enolase catalyzes

The enzyme glucokinase

Which of the following enzymes interconverts an aldose and a ketose?

Anaerobic metabolism can occur in all these organisms or cells,except:

The fate of pyruvate produced during glycolysis depends primarily on the availability of

Which of the following enzymes relies on thiamine pyrophosphate as a cofactor?

Which of the following enzymes of anaerobic metabolism is not tetrameric?

The equilibrium for isomerization of dihydroxyacetone phosphate to glyceraldehyde-3-phosphate is favored because

The DG values for glycolytic reactions at physiological conditions may be exergonic,even though the DG°' at "standard" conditions,may be endergonic.

The isomerization of dihydroxyacetone phosphate to give glyceraldehyde 3-phosphate

Which of the following enzymes forms a thioester using a cysteine residue as a key intermediate?

Which of the following is not an end product of glucose metabolism via either aerobic or anaerobic means?

Biochemistry and the Organization of Cells

Water: The Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three-Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins: Enzymes

The Behavior of Proteins: Enzymes, Mechanisms, and Control

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids: How Structure Conveys Information

Biosynthesis of Nucleic Acids: Replication

Transcription of the Genetic Code: Biosynthesis of Rna

Protein Synthesis: Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses, Cancer, and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism: Cellular Signaling

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