Question 1

Which statement concerning glycolysis is FALSE?

Accepted Answer

A)  Glycolysis is an anaerobic process that occurs in the cytoplasm of the cell.
B)  Glycolysis requires energy provided by ATP.
C)  Glycolysis is a pathway that consists of ten enzyme catalyzed reactions.
D)  Glycolysis is the final step in the process to produce energy from food.
E)  Glycolysis breaks down glucose into two pyruvate molecules.F) B) and E)
G) A) and E)

Question 2

What compound is produced during strenuous exercise, when the muscles are depleted of oxygen?

Accepted Answer

A)  pyruvate
B)  NADPH
C)  lactate
D)  ethanol
E)  carbon dioxideF) C) and D)
G) B) and C)

Question 3

The end product of glycolysis is pyruvate.What condition inside the cell is needed to convert pyruvate to acetyl CoA for entry into the citric acid cycle?

Accepted Answer

A)  sufficient oxygen
B)  anaerobic conditions
C)  yeast
D)  high CO2
E)  All of these are correct.F) B) and E)
G) C) and D)

Question 4

Which of the following statements concerning ATP is FALSE?

Accepted Answer

A)  ATP is considered the universal energy currency in cells.
B)  ATP is a nucleotide triphosphate.
C)  ATP contains a phosphoester bond.
D)  ATP contains the sugar deoxyribose.
E)  The three phosphoryl groups of ATP are joined by phosphoanhydride bonds.F) None of the above
G) C) and D)

Question 5

The hormone insulin stimulates which of the following biochemical pathways?

Accepted Answer

A)  glycogenesis
B)  gluconeogenesis
C)  glycogenolysis
D)  glycolysis
E)  reoxidation of NADHF) A) and B)
G) A) and E)

Question 6

What polymer is the principal storage form of glucose?

Accepted Answer

A)  glycogen
B)  cellulose
C)  starch
D)  DNA
E)  insulinF) A) and D)
G) A) and C)

Question 7

In the Cori Cycle, lactate produced in muscles is transported to the liver where it is converted to glucose and returned to the muscles.

Accepted Answer

A) True 
 B)False

Question 8

Excess glucose is stored in the body as glycogen.Where are these glycogen reserves primarily found?

Accepted Answer

A)  brain and red blood cells
B)  red blood cells and liver
C)  adipose tissue and brain
D)  liver and skeletal muscles
E)  kidneys and fat cellsF) B) and E)
G) C) and E)

Question 9

How many NADH are produced for each glucose molecule that enters glycolysis?

Accepted Answer

A)  1
B)  2
C)  4
D)  6
E)  8F) A) and E)
G) A) and B)

Question 10

The pentose phosphate pathway is an alternate pathway for glucose oxidation.

Accepted Answer

A) True 
 B)False

Question 11

Digestion of carbohydrates begins in the mouth with the aid of what enzyme?

Accepted Answer

A)  glucase
B)  pepsin
C)  ATP
D)  amylase
E)  NAD+F) A) and E)
G) B) and C)

Question 12

What substance is converted into fructose-6-phosphate by the enzyme phosphoglucoisomerase?

Accepted Answer

A)  glucose-1,6-bisphosphate
B)  pyruvate
C)  lactate
D)  glycerol
E)  glucose-6-phosphateF) B) and D)
G) A) and E)

Question 13

The formation of glucose-6-phosphate from glucose in a liver cell effectively traps the glucose within the cell.

Accepted Answer

A) True 
 B)False

Question 14

Stage I of catabolism produces the most ATP.

Accepted Answer

A) True 
 B)False

Question 15

The primary function of catabolic pathways is the generation of a particular substance.What is this substance?

Accepted Answer

A)  O2
B)  inorganic phosphate
C)  ATP
D)  glucose
E)  AMPF) All of the above
G) A) and C)

Question 16

Skeletal muscle cannot contribute to blood glucose as it lacks the enzyme necessary to convert glucose-6-phosphate to glucose.

Accepted Answer

A) True 
 B)False

Question 17

What is the reducing agent for the conversion of pyruvate into lactate in muscle tissue?

Accepted Answer

A)  NAD+
B)  NADPH
C)  NADH
D)  FAD
E)  FADH2F) A) and E)
G) None of the above

Question 18

The last step of glycolysis is the kinase catalyzed reaction represented below.What is the identity of the missing product? phosphoenolpyruvate + ADP → ATP + ?

Accepted Answer

A)  Pi
B)  AMP
C)  glucose
D)  pyruvate
E)  glycogenF) B) and E)
G) C) and E)

Question 19

Approximately how much energy, in kilocalories, is released by one mole of ATP in the hydrolysis reaction shown below? ATP + water → ADP + Pi + energy

Accepted Answer

A)  7
B)  15
C)  32
D)  700
E)  1000F) A) and E)
G) D) and E)

Question 20

What is the first reaction in glycolysis, which traps glucose within the cell?

Accepted Answer

A)  oxidation of glucose
B)  hydrolysis of glucose
C)  hydrogenation of glucose
D)  phosphorylation of glucose
E)  dehydration of glucoseF) B) and D)
G) A) and D)

Exam 21: Carbohydrate Metabolism

How many NADH are produced for each glucose molecule that enters glycolysis?

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What is the first reaction in glycolysis, which traps glucose within the cell?

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Approximately how much energy, in kilocalories, is released by one mole of ATP in the hydrolysis reaction shown below? ATP + water → ADP + Pi + energy

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The formation of glucose-6-phosphate from glucose in a liver cell effectively traps the glucose within the cell.

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What substance is converted into fructose-6-phosphate by the enzyme phosphoglucoisomerase?

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Excess glucose is stored in the body as glycogen.Where are these glycogen reserves primarily found?

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Skeletal muscle cannot contribute to blood glucose as it lacks the enzyme necessary to convert glucose-6-phosphate to glucose.

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What is the reducing agent for the conversion of pyruvate into lactate in muscle tissue?

Correct AnswerverifiedShow Answer

The primary function of catabolic pathways is the generation of a particular substance.What is this substance?

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The pentose phosphate pathway is an alternate pathway for glucose oxidation.

Correct AnswerverifiedShow Answer

What compound is produced during strenuous exercise, when the muscles are depleted of oxygen?

Correct AnswerverifiedShow Answer

The hormone insulin stimulates which of the following biochemical pathways?

Correct AnswerverifiedShow Answer

What polymer is the principal storage form of glucose?

Correct AnswerverifiedShow Answer

In the Cori Cycle, lactate produced in muscles is transported to the liver where it is converted to glucose and returned to the muscles.

Correct AnswerverifiedShow Answer

Which statement concerning glycolysis is FALSE?

Correct AnswerverifiedShow Answer

The end product of glycolysis is pyruvate.What condition inside the cell is needed to convert pyruvate to acetyl CoA for entry into the citric acid cycle?

Correct AnswerverifiedShow Answer

Digestion of carbohydrates begins in the mouth with the aid of what enzyme?

Correct AnswerverifiedShow Answer

Which of the following statements concerning ATP is FALSE?

Correct AnswerverifiedShow Answer

The last step of glycolysis is the kinase catalyzed reaction represented below.What is the identity of the missing product? phosphoenolpyruvate + ADP → ATP + ?

Correct AnswerverifiedShow Answer

Stage I of catabolism produces the most ATP.

Correct AnswerverifiedShow Answer

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Approximately how much energy, in kilocalories, is released by one mole of ATP in the hydrolysis reaction shown below? ATP + water → ADP + P_i + energy

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