Question 1

Which steps of the citric acid cycle generate reduced coenzymes necessary in the production of ATP?

Accepted Answer

A) Steps 2,3,4,and 7 
B) Steps 1,4,7,and 8 
C) Steps 3,4,5,and 7 
D) Steps 3,4,6,and 8 
A) Steps 2,3,4,and 7 
B) Steps 1,4,7,and 8 
C) Steps 3,4,5,and 7 
D) Steps 3,4,6,and 8

Question 2

Which is an oxidizing agent?

Accepted Answer

A) Fe2+ 
B) NAD+ 
C) FADH2 
D) ATP 
A) Fe2+ 
B) NAD+ 
C) FADH2 
D) ATP

Question 3

The reduced coenzymes formed in the citric acid cycle enter the ________.

Accepted Answer

electron t

Question 4

Where does the electron transport chain process take place?

Accepted Answer

A) In the inner membrane of mitochondria 
B) In the outer membrane of mitochondria 
C) In the intermembrane space of mitochondria 
D) In the matrix of mitochondria 
A) In the inner membrane of mitochondria 
B) In the outer membrane of mitochondria 
C) In the intermembrane space of mitochondria 
D) In the matrix of mitochondria

Question 5

The cells in heart tissue have more mitochondria than the cells in bone tissue.

Accepted Answer

A) True 
 B)False

Question 6

The final stage of the electron transport chain forms water in an anaerobic process.

Accepted Answer

A) True 
 B)False

Question 7

Which is not true about coenzymes?

Accepted Answer

A) Many reactions in metabolic pathways involve coenzymes. 
B) When a coenzyme gains hydrogen atoms the coenzyme is an oxidizing agent. 
C) Many coenzymes are involved in oxidation and reduction reactions. 
D) The coenzyme nicotinamide adenine dinucleotide,NAD+,is a common biological reducing agent. 
A) Many reactions in metabolic pathways involve coenzymes. 
B) When a coenzyme gains hydrogen atoms the coenzyme is an oxidizing agent. 
C) Many coenzymes are involved in oxidation and reduction reactions. 
D) The coenzyme nicotinamide adenine dinucleotide,NAD+,is a common biological reducing agent.

Question 8

Energy released from H+ movement in the electron transport chain fuels the phosphorylation of ADP.

Accepted Answer

A) True 
 B)False

Question 9

The rate of the citric acid cycle depends on the body's need for energy. When energy demands are low and NADH concentration is high,the cycle is inhibited.

Accepted Answer

A) True 
 B)False

Question 10

The product of the catabolic pathways is different for proteins,triacylglycerols,and carbohydrates.

Accepted Answer

A) True 
 B)False

Question 11

Which molecule contains the largest amount of stored energy?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 12

Which is not a reaction found in stage [2] of catabolism?

Accepted Answer

A) Fatty acid oxidation 
B) Glycolysis 
C) Oxidative phosphorylation 
D) Amino acid catabolism 
A) Fatty acid oxidation 
B) Glycolysis 
C) Oxidative phosphorylation 
D) Amino acid catabolism

Question 13

The terms phosphorylation and oxidative phosphorylation may be used interchangeably.

Accepted Answer

A) True 
 B)False

Question 14

Each NADH enters the electron transport chain at complex I in the inner mitochondrial membrane and the resulting cascade of reactions produces enough energy to synthesize 4 ATPs.

Accepted Answer

A) True 
 B)False

Question 15

Why is hydrogen cyanide,HCN,poisonous?

Accepted Answer

A) HCN is a strong acid,dramatically altering the pH in cells. 
B) Cyanide ions (-CN)irreversibly bind to the Fe3+ ion of cytochrome oxidase. 
C) Cyanide ions (-CN)irreversibly bind to acetyl CoA. 
D) Cyanide ions (-CN)irreversibly bind to NAD+. 
A) HCN is a strong acid,dramatically altering the pH in cells. 
B) Cyanide ions (-CN)irreversibly bind to the Fe3+ ion of cytochrome oxidase. 
C) Cyanide ions (-CN)irreversibly bind to acetyl CoA. 
D) Cyanide ions (-CN)irreversibly bind to NAD+.

Question 16

How many molecules of ATP are produced for each unit of GTP formed in the citric acid cycle?

Accepted Answer

A) 4 
B) 3 
C) 2 
D) D1 
A) 4 
B) 3 
C) 2 
D) D1

Question 17

How many molecules of reduced coenzymes are produced for each turn of the citric acid cycle?

Accepted Answer

A) 2 
B) 4 
C) 16 
D) 32 
A) 2 
B) 4 
C) 16 
D) 32

Question 18

The structure of flavin adenine dinucleotide (FAD)is shown here.

Accepted Answer

A) True 
 B)False

Question 19

How many reactions make up the citric acid cycle?

Accepted Answer

A) 3 
B) 4 
C) 6 
D) 8 
A) 3 
B) 4 
C) 6 
D) 8

Question 20

Coenzyme A,NADH,and FAD all contain phosphate groups.

Accepted Answer

A) True 
 B)False

Exam 23: Metabolism and Energy Production

Which steps of the citric acid cycle generate reduced coenzymes necessary in the production of ATP?

Which is an oxidizing agent?

The reduced coenzymes formed in the citric acid cycle enter the ________.

Where does the electron transport chain process take place?

The cells in heart tissue have more mitochondria than the cells in bone tissue.

The final stage of the electron transport chain forms water in an anaerobic process.

Which is not true about coenzymes?

Energy released from H+ movement in the electron transport chain fuels the phosphorylation of ADP.

The rate of the citric acid cycle depends on the body's need for energy. When energy demands are low and NADH concentration is high,the cycle is inhibited.

The product of the catabolic pathways is different for proteins,triacylglycerols,and carbohydrates.

Which molecule contains the largest amount of stored energy?

Which is not a reaction found in stage [2] of catabolism?

The terms phosphorylation and oxidative phosphorylation may be used interchangeably.

Each NADH enters the electron transport chain at complex I in the inner mitochondrial membrane and the resulting cascade of reactions produces enough energy to synthesize 4 ATPs.

Why is hydrogen cyanide,HCN,poisonous?

How many molecules of ATP are produced for each unit of GTP formed in the citric acid cycle?

How many molecules of reduced coenzymes are produced for each turn of the citric acid cycle?

The structure of flavin adenine dinucleotide (FAD)is shown here.

How many reactions make up the citric acid cycle?

Coenzyme A,NADH,and FAD all contain phosphate groups.

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Introduction to Organic Molecules and Functional Groups

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The Three-Dimensional Shape of Molecules

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Energy released from H⁺ movement in the electron transport chain fuels the phosphorylation of ADP.