Question 1

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 2

The reactions where glucose is converted to glucose 6-phosphate and fructose 6-phosphate is converted to fructose 1,5-bisphosphate are examples of:

Accepted Answer

A)  exergonic reactions 
B)  priming reactions 
C)  phosphorylation reactions 
D)  kinase reactions 
E)  all of these 
A)  exergonic reactions 
B)  priming reactions 
C)  phosphorylation reactions 
D)  kinase reactions 
E)  all of these

Question 3

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

Accepted Answer

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

Question 4

Thiamine pyrophosphate is a coenzyme

Accepted Answer

A)  frequently encountered in oxidation-reduction reactions. 
B)  required for the phosphorylation of ADP. 
C)  involved in transfers of two-carbon groups. 
D)  involved in transfers of one-carbon groups. 
A)  frequently encountered in oxidation-reduction reactions. 
B)  required for the phosphorylation of ADP. 
C)  involved in transfers of two-carbon groups. 
D)  involved in transfers of one-carbon groups.

Question 5

What is the net ATP yield per glucose during glycolysis?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  6 
A)  1 
B)  2 
C)  3 
D)  4 
E)  6

Question 6

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 7

Methanol is extremely toxic, but not directly. In the body, it is converted into formaldehyde; that's what's actually the poison. What kind of enzyme catalyses this conversion?

Accepted Answer

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

Question 8

The reduction of pyruvate to lactate

Accepted Answer

A)  allows for recycling of NAD+. 
B)  is the process that aids in the recovery of sore muscles after exercise. 
C)  is accompanied by phosphorylation of ADP. 
D)  does not occur in aerobic organisms. 
A)  allows for recycling of NAD+. 
B)  is the process that aids in the recovery of sore muscles after exercise. 
C)  is accompanied by phosphorylation of ADP. 
D)  does not occur in aerobic organisms.

Question 9

What is the name of the pictured glycolytic intermediate?

Accepted Answer

A)  1-phosphoglycerate 
B)  glyceraldehyde-3-phosphate 
C)  dihydroxyacetone phosphate 
D)  3-phosphoglycerate 
A)  1-phosphoglycerate 
B)  glyceraldehyde-3-phosphate 
C)  dihydroxyacetone phosphate 
D)  3-phosphoglycerate

Question 10

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 11

In humans, pyruvate can be converted to

Accepted Answer

A)  acetyl-CoA only. 
B)  lactate only. 
C)  ethanol only. 
D)  acetyl-CoA and lactate. 
A)  acetyl-CoA only. 
B)  lactate only. 
C)  ethanol only. 
D)  acetyl-CoA and lactate.

Question 12

Which of the following is required for substrate-level phosphorylation?

Accepted Answer

A)  The substrate must contain multiple phosphate groups. 
B)  Molecular oxygen must present. 
C)  The standard free energy of the hydrolysis reaction is more negative than that for hydrolysis of the new phosphate compound being formed. 
D)  All of the above are necessary for substrate-level phosphorylation. 
A)  The substrate must contain multiple phosphate groups. 
B)  Molecular oxygen must present. 
C)  The standard free energy of the hydrolysis reaction is more negative than that for hydrolysis of the new phosphate compound being formed. 
D)  All of the above are necessary for substrate-level phosphorylation.

Question 13

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 14

Glycolysis

Accepted Answer

A)  does not require O2 to generate energy. 
B)  requires O2 to generate energy. 
C)  is inhibited by O2. 
D)  rate is increased in the presence of O2. 
A)  does not require O2 to generate energy. 
B)  requires O2 to generate energy. 
C)  is inhibited by O2. 
D)  rate is increased in the presence of O2.

Question 15

The amino acid cysteine is important in adding a second phosphate to glyceraldehyde phosphate in the glyceraldehyde-3-phosphate dehydrogenase reaction.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following is true about phosphofructokinase?

Accepted Answer

A)  It is made of a single polypeptide chain 
B)  It is found in the muscle only 
C)  It is made up of four subunits, potentially of two different types 
D)  A person who lacks the M subunit does not have the glycolytic pathway 
A)  It is made of a single polypeptide chain 
B)  It is found in the muscle only 
C)  It is made up of four subunits, potentially of two different types 
D)  A person who lacks the M subunit does not have the glycolytic pathway

Question 17

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 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

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 20

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

Exam 17: Glycolysis

Which enzyme catalyzes the reaction shown?

The reactions where glucose is converted to glucose 6-phosphate and fructose 6-phosphate is converted to fructose 1,5-bisphosphate are examples of:

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

Thiamine pyrophosphate is a coenzyme

What is the net ATP yield per glucose during glycolysis?

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

Methanol is extremely toxic, but not directly. In the body, it is converted into formaldehyde; that's what's actually the poison. What kind of enzyme catalyses this conversion?

The reduction of pyruvate to lactate

What is the name of the pictured glycolytic intermediate?

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

In humans, pyruvate can be converted to

Which of the following is required for substrate-level phosphorylation?

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

Glycolysis

The amino acid cysteine is important in adding a second phosphate to glyceraldehyde phosphate in the glyceraldehyde-3-phosphate dehydrogenase reaction.

Which of the following is true about phosphofructokinase?

Which of the following enzymes catalyzes a dehydration reaction?

In glycolysis, ATP is synthesized by

The isomerization of dihydroxyacetone phosphate to give glyceraldehyde 3-phosphate

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

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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