Question 1

Which of the following is not true?

Accepted Answer

A)  Multiple isozymes of lactate dehydrogenase are used as clinical means for diagnosing heart attacks. 
B)  Two enzymes involved in anaerobic glycolysis are found as isozymes with 5 different forms 
C)  The M4 version of lactate dehydrogenase predominates in heart tissue 
D)  After a myocardial infarction, the blood serum levels of MH3 and H4 isozymes increase 
A)  Multiple isozymes of lactate dehydrogenase are used as clinical means for diagnosing heart attacks. 
B)  Two enzymes involved in anaerobic glycolysis are found as isozymes with 5 different forms 
C)  The M4 version of lactate dehydrogenase predominates in heart tissue 
D)  After a myocardial infarction, the blood serum levels of MH3 and H4 isozymes increase C

Question 2

Which of the following sugars can be a substrate for hexokinase?

Accepted Answer

A)  glucose 
B)  fructose 
C)  mannose 
D)  all of these 
E)  none of these 
A)  glucose 
B)  fructose 
C)  mannose 
D)  all of these 
E)  none of these D

Question 3

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 A

Question 4

Which of the following enzymes catalyzes a dehydration reaction?

Accepted Answer

A)  Glyceraldehyde-3-phosphate dehydrogenase 
B)  Enolase 
C)  Phosphofructokinase 
D)  Aldolase 
A)  Glyceraldehyde-3-phosphate dehydrogenase 
B)  Enolase 
C)  Phosphofructokinase 
D)  Aldolase

Question 5

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 6

Which enzyme is the key regulatory enzyme in glycolysis?

Accepted Answer

A)  Glyceraldehyde-3-phosphate dehydrogenase 
B)  Enolase 
C)  Phosphofructokinase 
D)  Aldolase 
A)  Glyceraldehyde-3-phosphate dehydrogenase 
B)  Enolase 
C)  Phosphofructokinase 
D)  Aldolase

Question 7

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

Question 8

The reaction of fructose 1,6- bis phosphate 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 9

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 10

During anaerobic metabolism in red blood cells, the carbons of glucose end up in

Accepted Answer

A)  CO2. 
B)  ethanol. 
C)  lactic acid. 
D)  both CO2 and ethanol. 
E)  all of the above. 
A)  CO2. 
B)  ethanol. 
C)  lactic acid. 
D)  both CO2 and ethanol. 
E)  all of the above.

Question 11

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 12

The order of compounds in the conversion of glucose to pyruvic acid is as follows: (PEP = phosphoenolpyruvate)

Accepted Answer

A)  Fructose- bis phosphate, fructose-6-phosphate, 1,3-phosphoglyceric acid, 3-phosphoglyceric acid, PEP. 
B)  Fructose-6-phosphate, fructose- bis phosphate, PEP, 1,3-phosphoglyceric acid, 3-phosphoglyceric acid. 
C)  Fructose-6-phosphate, fructose- bis phosphate, 1,3-phosphoglyceric acid, 3-phosphoglyceric acid, PEP. 
D)  Fructose-6-phosphate, fructose- bis phosphate, 3-phosphoglyceric acid, 1,3-phosphoglyceric acid, PEP. 
E)  Fructose- bis phosphate, fructose-6-phosphate, 3-phosphoglyceric acid, 1,3-phosphoglyceric acid, PEP. 
A)  Fructose- bis phosphate, fructose-6-phosphate, 1,3-phosphoglyceric acid, 3-phosphoglyceric acid, PEP. 
B)  Fructose-6-phosphate, fructose- bis phosphate, PEP, 1,3-phosphoglyceric acid, 3-phosphoglyceric acid. 
C)  Fructose-6-phosphate, fructose- bis phosphate, 1,3-phosphoglyceric acid, 3-phosphoglyceric acid, PEP. 
D)  Fructose-6-phosphate, fructose- bis phosphate, 3-phosphoglyceric acid, 1,3-phosphoglyceric acid, PEP. 
E)  Fructose- bis phosphate, fructose-6-phosphate, 3-phosphoglyceric acid, 1,3-phosphoglyceric acid, PEP.

Question 13

In the conversion of glucose to pyruvate, how many of the actual steps involve electron transfer?

Accepted Answer

A)  none 
B)  1 
C)  2 
D)  3 
E)  4 
A)  none 
B)  1 
C)  2 
D)  3 
E)  4

Question 14

Which 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 15

If glycolysis did not lead to the production of ATP, the overall process would

Accepted Answer

A)  release less energy 
B)  release more energy 
C)  absorb energy 
D)  not take place in aerobic organisms 
A)  release less energy 
B)  release more energy 
C)  absorb energy 
D)  not take place in aerobic organisms

Question 16

Which group of small molecules best fit the boxes associated with the reaction shown?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 17

How many steps in glycolysis have ATP as a substrate or product?

Accepted Answer

A)  zero 
B)  1 
C)  2 
D)  4 
E)  6
F) none of these 
A)  zero 
B)  1 
C)  2 
D)  4 
E)  6
F) none of these

Question 18

In glycolysis, ATP is synthesized by

Accepted Answer

A)  substrate-level phosphorylation. 
B)  oxidative phosphorylation. 
C)  photophosphorylation. 
D)  both substrate-level and oxidative phosphorylation. 
E)  all three of the above methods. 
A)  substrate-level phosphorylation. 
B)  oxidative phosphorylation. 
C)  photophosphorylation. 
D)  both substrate-level and oxidative phosphorylation. 
E)  all three of the above methods.

Question 19

Which of the following exercise(s) allosteric control in the reaction of phosphofructokinase?

Accepted Answer

A)  ATP 
B)  fructose 2,6- bis phosphate 
C)  both of these 
D)  neither of these 
A)  ATP 
B)  fructose 2,6- bis phosphate 
C)  both of these 
D)  neither of these

Question 20

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

Exam 17: Glycolysis

Which of the following is not true?

Which of the following sugars can be a substrate for hexokinase?

Which of the following is not true?

Which of the following enzymes catalyzes a dehydration reaction?

The isomerization of dihydroxyacetone phosphate to give glyceraldehyde 3-phosphate

Which enzyme is the key regulatory enzyme in glycolysis?

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

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

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

During anaerobic metabolism in red blood cells, the carbons of glucose end up in

The enzyme glucokinase

The order of compounds in the conversion of glucose to pyruvic acid is as follows: (PEP = phosphoenolpyruvate)

In the conversion of glucose to pyruvate, how many of the actual steps involve electron transfer?

Which enzyme catalyzes the reaction shown?

If glycolysis did not lead to the production of ATP, the overall process would

Which group of small molecules best fit the boxes associated with the reaction shown?

How many steps in glycolysis have ATP as a substrate or product?

In glycolysis, ATP is synthesized by

Which of the following exercise(s) allosteric control in the reaction of phosphofructokinase?

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

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 the 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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