Question 1

____________ and transketolase are the enzymes that link glycolysis and the pentose phosphate pathway.

Accepted Answer

A) nonoxidative 
B) oxidative 
C) transketolase 
D) glucose 6-phosphate 
E) reducing equivalents
F)thiamine pyrophosphate
G)transaldolase
H)glutathione reductase
I)glycolysis
J)NADH
K)fructose 6-phosphate
L)NADPH/pentose phosphate pathway
M)glucose

Question 2

____________ is the key source of biosynthetic reducing equivalents.

Accepted Answer

A) nonoxidative 
B) oxidative 
C) transketolase 
D) glucose 6-phosphate 
E) reducing equivalents
F)thiamine pyrophosphate
G)transaldolase
H)glutathione reductase
I)glycolysis
J)NADH
K)fructose 6-phosphate
L)NADPH/pentose phosphate pathway
M)glucose

Question 3

The enzyme transketolase transfers a _________________-carbon fragment from a ketose to an aldose.

Accepted Answer

The answer of The enzyme transketolase transfers a _________________-carbon fragment...

Question 4

How can a deficiency of glucose 6-phosphate confer a physiological advantage?

Accepted Answer

The answer of How can a deficiency of glucose 6-phosphate...

Question 5

Which biosynthetic pathway requires NADH?

Accepted Answer

A)  cholesterol 
B)  fatty acid 
C)  nucleotide 
D)  All of the above. 
E)  None of the above.

Question 6

Isomers with multiple asymmetric centers differing in only one asymmetric center is/are a(n) _________________.

Accepted Answer

The answer of Isomers with multiple asymmetric centers differing in...

Question 7

_________________ is converted to xylulose 5-phosphate by the enzyme phosphopentose epimerase.

Accepted Answer

The answer of _________________ is converted to xylulose 5-phosphate by...

Question 8

In the nonoxidative phase of the pentose phosphate pathway, two reactions are catalyzed by transketolase. What are the substrates and products of these reactions?

Accepted Answer

The answer of In the nonoxidative phase of the pentose...

Question 9

Glucose 6-phosphate dehydrogenase is inhibited by low levels of:

Accepted Answer

A)  NADPH. 
B)  NADP+. 
C)  ribose 5-phosphate. 
D)  A and C. 
E)  B and C.

Question 10

_________________ is the committed step of the pentose phosphate pathway.

Accepted Answer

The answer of _________________ is the committed step of the...

Question 11

What is the common feature of the mechanism of the metabolic oxidations of 6-phosphogluconate and isocitrate?

Accepted Answer

The answer of What is the common feature of the...

Question 12

____________ results in a C3 and a C7 carbohydrate from two C5 carbohydrate precursors.

Accepted Answer

A) nonoxidative 
B) oxidative 
C) transketolase 
D) glucose 6-phosphate 
E) reducing equivalents
F)thiamine pyrophosphate
G)transaldolase
H)glutathione reductase
I)glycolysis
J)NADH
K)fructose 6-phosphate
L)NADPH/pentose phosphate pathway
M)glucose

Question 13

_________________ is the enzynme that catalyzes the hydrolysis of the ester linkage of the lactone, resulting in the ring opening.

Accepted Answer

The answer of _________________ is the enzynme that catalyzes the...

Question 14

The purpose of the pentose phosphate pathway is to:

Accepted Answer

A)  generate ATP. 
B)  generate NADPH. 
C)  synthesize five-carbon sugars. 
D)  A and B. 
E)  B and C.

Question 15

Which sugar(s) is/are converted into ribulose 5-phosphate by a single enzymatic step?

Accepted Answer

A)  ribose 5-phosphate 
B)  xyulose 5-phosphate 
C)  erythrose 4-phosphate 
D)  A and B 
E)  C and C

Question 16

How does NADPH protect red blood cells from hemolysis?

Accepted Answer

The answer of How does NADPH protect red blood cells...

Question 17

NADPH is required by the liver and adipose for synthesis of _________________.

Accepted Answer

The answer of NADPH is required by the liver and...

Question 18

Hemolytic anemia is caused by a deficiency of the enzyme _________________.

Accepted Answer

The answer of Hemolytic anemia is caused by a deficiency...

Question 19

Several physiological modes are possible for the metabolic need for NADPH, ribose 5-phosphate, and ATP. In one scenario, such as found in adipose tissue, much more NADPH is required than ribose 5-phosphate. How is this maintained?

Accepted Answer

The answer of Several physiological modes are possible for the...

Question 20

In mode two:

Accepted Answer

A)  the needs for NADPH and ribose 5-phosphate are balanced, 
B)  much more NADPH than ribose 5-phosphate is required. 
C)  more ribose 5-phosphate than NADPH is required. 
D)  NADPH and CO2 are required. 
E)  excess NAD+is required. .

Exam 26: The Pentose Phosphate Pathway

____________ and transketolase are the enzymes that link glycolysis and the pentose phosphate pathway.

____________ is the key source of biosynthetic reducing equivalents.

The enzyme transketolase transfers a _________________-carbon fragment from a ketose to an aldose.

How can a deficiency of glucose 6-phosphate confer a physiological advantage?

Which biosynthetic pathway requires NADH?

Isomers with multiple asymmetric centers differing in only one asymmetric center is/are a(n) _________________.

_________________ is converted to xylulose 5-phosphate by the enzyme phosphopentose epimerase.

In the nonoxidative phase of the pentose phosphate pathway, two reactions are catalyzed by transketolase. What are the substrates and products of these reactions?

Glucose 6-phosphate dehydrogenase is inhibited by low levels of:

_________________ is the committed step of the pentose phosphate pathway.

What is the common feature of the mechanism of the metabolic oxidations of 6-phosphogluconate and isocitrate?

____________ results in a C3 and a C7 carbohydrate from two C5 carbohydrate precursors.

_________________ is the enzynme that catalyzes the hydrolysis of the ester linkage of the lactone, resulting in the ring opening.

The purpose of the pentose phosphate pathway is to:

Which sugar(s) is/are converted into ribulose 5-phosphate by a single enzymatic step?

How does NADPH protect red blood cells from hemolysis?

NADPH is required by the liver and adipose for synthesis of _________________.

Hemolytic anemia is caused by a deficiency of the enzyme _________________.

Several physiological modes are possible for the metabolic need for NADPH, ribose 5-phosphate, and ATP. In one scenario, such as found in adipose tissue, much more NADPH is required than ribose 5-phosphate. How is this maintained?

In mode two: