Question 1

How is the pentose phosphate pathway regulated?

Accepted Answer

The level of NADP+ is very important in ...

Question 2

The pentose phosphate pathway:

Accepted Answer

A)   is stimulated by NADH.
B)   is stimulated by NADPH.
C)   operates primarily in nondividing cells.
D)   is contained within the mitochondria of adipose cells.
E)   None of the above.

Question 3

____________ is a substrate for the pentose phosphate pathway.

Accepted Answer

A)  nonoxidative
B)  oxidative
C)  transketolase
D)  glucose 6-phosphate
E)  reducing equivalentsF) thiamine pyrophosphateG) transaldolaseH) glutathione reductaseI) glycolysisJ) NADHK) fructose 6-phosphateL) NADPH/pentose phosphate pathwayM) glucose D

Question 4

The prosthetic group ____________ is tightly bound to the enzyme transketolase.

Accepted Answer

A)  nonoxidative
B)  oxidative
C)  transketolase
D)  glucose 6-phosphate
E)  reducing equivalentsF) thiamine pyrophosphateG) transaldolaseH) glutathione reductaseI) glycolysisJ) NADHK) fructose 6-phosphateL) NADPH/pentose phosphate pathwayM) glucose

Question 5

NADPH is required for which of the following detoxification reactions or enzymes?

Accepted Answer

A)   cytochrome P450 monooxygenase
B)   reduction of glutathione(ox) 
C)   deamination of serine
D)   A and B
E)   All of the above.

Question 6

A deficiency of glucose 6-phosphate can cause hemolytic anemia. This is due to a loss in activity in which enzyme in red blood cells?

Accepted Answer

A)  nonoxidative
B)  oxidative
C)  transketolase
D)  glucose 6-phosphate
E)  reducing equivalentsF) thiamine pyrophosphateG) transaldolaseH) glutathione reductaseI) glycolysisJ) NADHK) fructose 6-phosphateL) NADPH/pentose phosphate pathwayM) glucose

Question 7

Excess carbons of the pentose phosphate pathway are shunted to what other metabolic pathway?

Accepted Answer

A)  nonoxidative
B)  oxidative
C)  transketolase
D)  glucose 6-phosphate
E)  reducing equivalentsF) thiamine pyrophosphateG) transaldolaseH) glutathione reductaseI) glycolysisJ) NADHK) fructose 6-phosphateL) NADPH/pentose phosphate pathwayM) glucose

Question 8

Under what conditions might the pentose phosphate pathway produce large amounts of NADPH without significant net production of ribose 5-phosphate?

Accepted Answer

A)   synthesis of fatty acids in the liver
B)   when pyruvate is synthesized to generate ATP
C)   when cells are rapidly dividing
D)   A and C
E)   B and C

Question 9

Reduced glutathione maintains red blood cell structure by:

Accepted Answer

A)   protecting against falciparum malaria.
B)   maintaining hemoglobin structure.
C)   preventing Heinz body formation.
D)   A and C.
E)   B and C.

Question 10

What are the reactions in the oxidative phase of the pentose phosphate pathway?

Accepted Answer

The first reaction is the oxidation of C...

Question 11

Which enzyme controls the pentose phosphate pathway?

Accepted Answer

While the overall rate of the ...

Question 12

The oxidative phase of the pentose phosphate pathway produces _________________, which is required for lipid biosynthesis.

Accepted Answer

NADPH

Question 13

The second phase of the pentose phosphate pathway is the ____________ phase.

Accepted Answer

A)  nonoxidative
B)  oxidative
C)  transketolase
D)  glucose 6-phosphate
E)  reducing equivalentsF) thiamine pyrophosphateG) transaldolaseH) glutathione reductaseI) glycolysisJ) NADHK) fructose 6-phosphateL) NADPH/pentose phosphate pathwayM) glucose

Question 14

Which of the following reactions is not part of the pentose phosphate pathway?

Accepted Answer

A)   
B)  
C)   
D)   
E)   All of the above.

Question 15

In the nonoxidative stage of the pentose phosphate pathway, intermediates of _____________ are produced.

Accepted Answer

A)   the citric acid cycle
B)   glycolysis
C)   glycogen degradation
D)   A and C
E)   B and C

Question 16

Ribulose 5-phosphate is the result of the ____________ phase.

Accepted Answer

A)  nonoxidative
B)  oxidative
C)  transketolase
D)  glucose 6-phosphate
E)  reducing equivalentsF) thiamine pyrophosphateG) transaldolaseH) glutathione reductaseI) glycolysisJ) NADHK) fructose 6-phosphateL) NADPH/pentose phosphate pathwayM) glucose

Question 17

ATP is called the energy currency. The currency of reducing power is:

Accepted Answer

A)   NADPH.
B)   NADH.
C)   AMP.
D)   ADP.
E)   None of the above. A

Question 18

The two key components required for growth are _________________ and biochemical reducing power.

Accepted Answer

The answer of The two key components required for growth...

Question 19

What is the net reaction of the transketolase and transaldolase steps?

Accepted Answer

A)   3C52C6 + C3
B)   2C5C6 + C4
C)   3C5C6 + 3C3
D)   2C52C4 + C2
E)   None of the above.

Question 20

______________ oxidizes the C3 hydroxyl to a ketone.

Accepted Answer

A)   Lactonase
B)   Glucose 6-phosphate dehydrogenase
C)   Transaldolase
D)   Transketolase
E)   6-phosphogluconate dehydrogenase

Exam 26: The Pentose Phosphate Pathway

How is the pentose phosphate pathway regulated?

Correct AnswerverifiedThe level of NADP+ is very important in ...View AnswerShow Answer

The pentose phosphate pathway:

Correct AnswerverifiedShow Answer

____________ is a substrate for the pentose phosphate pathway.

Correct AnswerverifiedD

The prosthetic group ____________ is tightly bound to the enzyme transketolase.

Correct AnswerverifiedShow Answer

NADPH is required for which of the following detoxification reactions or enzymes?

Correct AnswerverifiedShow Answer

A deficiency of glucose 6-phosphate can cause hemolytic anemia. This is due to a loss in activity in which enzyme in red blood cells?

Correct AnswerverifiedShow Answer

Excess carbons of the pentose phosphate pathway are shunted to what other metabolic pathway?

Correct AnswerverifiedShow Answer

Under what conditions might the pentose phosphate pathway produce large amounts of NADPH without significant net production of ribose 5-phosphate?

Correct AnswerverifiedShow Answer

Reduced glutathione maintains red blood cell structure by:

Correct AnswerverifiedShow Answer

What are the reactions in the oxidative phase of the pentose phosphate pathway?

Correct AnswerverifiedThe first reaction is the oxidation of C...View AnswerShow Answer

Which enzyme controls the pentose phosphate pathway?

Correct AnswerverifiedWhile the overall rate of the ...View AnswerShow Answer

The oxidative phase of the pentose phosphate pathway produces _________________, which is required for lipid biosynthesis.

Correct AnswerverifiedNADPH

The second phase of the pentose phosphate pathway is the ____________ phase.

Correct AnswerverifiedShow Answer

Which of the following reactions is not part of the pentose phosphate pathway?

Correct AnswerverifiedShow Answer

In the nonoxidative stage of the pentose phosphate pathway, intermediates of _____________ are produced.

Correct AnswerverifiedShow Answer

Ribulose 5-phosphate is the result of the ____________ phase.

Correct AnswerverifiedShow Answer

ATP is called the energy currency. The currency of reducing power is:

Correct AnswerverifiedA

The two key components required for growth are _________________ and biochemical reducing power.

Correct AnswerverifiedShow Answer

What is the net reaction of the transketolase and transaldolase steps?

Correct AnswerverifiedShow Answer

______________ oxidizes the C3 hydroxyl to a ketone.

Correct AnswerverifiedShow Answer

Correct Answer
verified
The level of NADP+ is very important in ...
View Answer

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The first reaction is the oxidation of C...
View Answer

Correct Answer
verified
While the overall rate of the ...
View Answer

Correct Answer
verified
NADPH

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified