Question 1

The following represents overall net equation for the citric acid cycle.
acetyl CoA + 3NAD+ + FAD + GDP + Pi + 2H2O
$\smile$
2CO2 + CoA-S-H + 3NADH + 2H+ + FADH2 + GTP

Accepted Answer

A) True 
 B)False

Question 2

Insulin is a regulatory enzyme.

Accepted Answer

A) True 
 B)False

Question 3

All of the members of the citric acid cycle are acids.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following is a product of glycolysis?

Accepted Answer

A)  pyruvate
B)  CO2 + H2O
C)  lactate
D)  acetyl CoAE) A) and D)
F) A) and C)

Question 5

Lactose intolerance

Accepted Answer

A)  can only be controlled by eliminating dairy products.
B)  produces symptoms including bloating and diarrhea.
C)  is due to a missing enzyme by approximately 20% of adults in the USA.
D)  All of these responses are correct.E) A) and C)
F) B) and D)

Question 6

During glycolysis the action of hexokinase is controlled by the concentration of glucose-6-phosphate.The first steps of glycolysis are shown below.  This is an example of feedback inhibition.

Accepted Answer

A) True 
 B)False

Question 7

A condition in which glucose appears in the urine is called _____ .

Accepted Answer

A)  hypoglycemia
B)  hyperglycemia
C)  glucosuria
D)  galactosemiaE) B) and D)
F) None of the above

Question 8

Glycogenolysis does not occur in muscle tissue because of the absence of the enzyme _____ .

Accepted Answer

A)  glucose 6-phosphatase
B)  glycogen phosphorylase
C)  phosphoglucomutase
D)  pyruvate kinaseE) B) and D)
F) All of the above

Question 9

Epinephrine stimulates glycolysis.

Accepted Answer

A) True 
 B)False

Question 10

The function of glycolysis is to extract energy from the glucose molecule.

Accepted Answer

A) True 
 B)False

Question 11

A key organ in regulating blood glucose levels is the _____ .

Accepted Answer

A)  heart
B)  liver
C)  adrenal cortex
D)  thyroidE) A) and B)
F) B) and C)

Question 12

Approximately ____ percent of the energy available in glucose catabolism is trapped in the formation of ATP.

Accepted Answer

A)  20
B)  40
C)  60
D)  80E) A) and D)
F) A) and C)

Question 13

The bulk of the energy utilized by marathon runners is provided by _____ .

Accepted Answer

A)  blood glucose
B)  glycogen
C)  protein
D)  fatty acidsE) A) and B)
F) All of the above

Question 14

The major products of carbohydrate digestion are _____ .

Accepted Answer

A)  monosaccharides
B)  monosaccharides & disaccharides
C)  acetyl CoA
D)  pyruvic acidE) A) and B)
F) C) and D)

Question 15

How many molecules of CO2 are produced per molecule of glucose as a result of the pyruvate dehydrogenase complex?

Accepted Answer

A)  0
B)  1
C)  2
D)  3E) All of the above
F) A) and C)

Question 16

Glycogen breakdown is increased in muscle tissue by the presence of epinephrine.

Accepted Answer

A) True 
 B)False

Question 17

The electrons and hydrogen ions carried from the citric acid cycle by FADH2 and NADH ultimately end up in the following reaction which occurs in the matrix of the mitochondria.

Accepted Answer

A) True 
 B)False

Question 18

The citric acid cycle (CAC)is also called the tricarboxylic acid (TCA)cycle and the Krebs cycle.

Accepted Answer

A) True 
 B)False

Question 19

Glucose-6-phosphate is best represented by which of the following? (Note: the wavy bond indicates that the -OH could either be up or down.)

Accepted Answer

A)   
B)   
C)   
D)   E) None of the above
F) C) and D)

Question 20

The free energy change for the complete oxidation of one mole of glucose is -686 kcal and  Δ\DeltaΔ G°' for the hydrolysis of ATP is -7.3 kcal/mol.How many moles of ATP could be synthesized if the entire oxidation process were 100% efficient in converting this energy to the production of ATP?

Accepted Answer

A)  0.0106 mol ATP
B)  94.0 mol ATP
C)  5.01* 103 mol ATP
D)  32.0 mol ATP E) B) and D)
F) A) and D)

Exam 23: Carbohydrate Metabolism

The function of glycolysis is to extract energy from the glucose molecule.

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A key organ in regulating blood glucose levels is the _____ .

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Which of the following is a product of glycolysis?

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The bulk of the energy utilized by marathon runners is provided by _____ .

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Insulin is a regulatory enzyme.

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Glycogenolysis does not occur in muscle tissue because of the absence of the enzyme _____ .

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The electrons and hydrogen ions carried from the citric acid cycle by FADH2 and NADH ultimately end up in the following reaction which occurs in the matrix of the mitochondria.

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The following represents overall net equation for the citric acid cycle. acetyl CoA + 3NAD+ + FAD + GDP + Pi + 2H2O ⌣\smile⌣ 2CO2 + CoA-S-H + 3NADH + 2H+ + FADH2 + GTP

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Approximately ____ percent of the energy available in glucose catabolism is trapped in the formation of ATP.

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Lactose intolerance

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How many molecules of CO2 are produced per molecule of glucose as a result of the pyruvate dehydrogenase complex?

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Glycogen breakdown is increased in muscle tissue by the presence of epinephrine.

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The major products of carbohydrate digestion are _____ .

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Glucose-6-phosphate is best represented by which of the following? (Note: the wavy bond indicates that the -OH could either be up or down.)

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A condition in which glucose appears in the urine is called _____ .

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The citric acid cycle (CAC)is also called the tricarboxylic acid (TCA)cycle and the Krebs cycle.

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Epinephrine stimulates glycolysis.

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The free energy change for the complete oxidation of one mole of glucose is -686 kcal and Δ\DeltaΔ G°' for the hydrolysis of ATP is -7.3 kcal/mol.How many moles of ATP could be synthesized if the entire oxidation process were 100% efficient in converting this energy to the production of ATP?

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All of the members of the citric acid cycle are acids.

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During glycolysis the action of hexokinase is controlled by the concentration of glucose-6-phosphate.The first steps of glycolysis are shown below. This is an example of feedback inhibition.

Correct AnswerverifiedShow Answer

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The electrons and hydrogen ions carried from the citric acid cycle by FADH₂ and NADH ultimately end up in the following reaction which occurs in the matrix of the mitochondria.

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The following represents overall net equation for the citric acid cycle. acetyl CoA + 3NAD⁺ + FAD + GDP + P_i + 2H₂O $\smile$ 2CO₂ + CoA-S-H + 3NADH + 2H⁺ + FADH₂ + GTP

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How many molecules of CO₂ are produced per molecule of glucose as a result of the pyruvate dehydrogenase complex?

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The free energy change for the complete oxidation of one mole of glucose is -686 kcal and $\Delta$ G°' for the hydrolysis of ATP is -7.3 kcal/mol.How many moles of ATP could be synthesized if the entire oxidation process were 100% efficient in converting this energy to the production of ATP?

Correct Answer
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