Question 1

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

Question 2

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.

Question 3

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

Accepted Answer

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

Question 4

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 5

What kind of enzyme catalyzes the reaction shown?

Accepted Answer

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

Question 6

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.

Question 7

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

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

Which enzyme catalyzes reaction the reaction shown?

Accepted Answer

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

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.

Question 11

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

Accepted Answer

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

Question 12

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

Question 13

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.

Question 14

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.

Question 15

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

Question 16

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.

Question 17

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.

Question 18

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

Question 19

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

Question 20

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.

Exam 17: Glycolysis

The enzyme glucokinase

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Enolase catalyzes

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Alcohol dehydrogenase resembles lactate dehydrogenase in that it

Correct AnswerverifiedShow Answer

What kind of enzyme catalyzes the reaction shown?

Correct AnswerverifiedShow Answer

The isomerization of dihydroxyacetone phosphate to give glyceraldehyde 3-phosphate

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which enzyme catalyzes reaction the reaction shown?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is not true?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified