Question 1

In the first reaction of the citric acid cycle,

Accepted Answer

A)  NADH is produced. 
B)  acetyl CoA reacts with oxaloacetate to give citrate. 
C)  ATP is produced. 
D)  glucose becomes pyruvate. 
E)  pyruvate becomes   
A)  NADH is produced. 
B)  acetyl CoA reacts with oxaloacetate to give citrate. 
C)  ATP is produced. 
D)  glucose becomes pyruvate. 
E)  pyruvate becomes   B

Question 2

11The citric acid cycle operates only under aerobic conditions because

Accepted Answer

A)  oxygen is a reactant in the citric acid cycle. 
B)  oxygen is a product of the citric acid cycle. 
C)    is a product of the citric acid cycle. 
D)  the   produced by the citric acid cycle can only be reduced by the electron transport. 
E)  the NADH and   produced by the citric acid cycle can only be reoxidized by the electron transport chain. 
A)  oxygen is a reactant in the citric acid cycle. 
B)  oxygen is a product of the citric acid cycle. 
C)    is a product of the citric acid cycle. 
D)  the   produced by the citric acid cycle can only be reduced by the electron transport. 
E)  the NADH and   produced by the citric acid cycle can only be reoxidized by the electron transport chain. E

Question 3

The last reaction in the citric acid cycle converts malate to

Accepted Answer

A) fumarate. 
B) succinate. 
C) citrate. 
D) oxaloacetate. 
E) isocitrate. 
A) fumarate. 
B) succinate. 
C) citrate. 
D) oxaloacetate. 
E) isocitrate. D

Question 4

Which of the following is NOT a possible product of pyruvate under anaerobic conditions?

Accepted Answer

A)    
B)  ethanol 
C)  lactate 
D)  fumarate 
A)    
B)  ethanol 
C)  lactate 
D)  fumarate

Question 5

In the chemiosmotic model, protons circulate through a protein complex called

Accepted Answer

A)  Complex III. 
B)  ATP synthase. 
C)  FMN. 
D)  CoQ 
E)  Cyt  c . 
A)  Complex III. 
B)  ATP synthase. 
C)  FMN. 
D)  CoQ 
E)  Cyt  c .

Question 6

The GTP formed in reaction 5 of the citric acid cycle is used to make

Accepted Answer

A) oxygen. 
B) carbon dioxide. 
C) ATP. 
D) water. 
E) CoA. 
A) oxygen. 
B) carbon dioxide. 
C) ATP. 
D) water. 
E) CoA.

Question 7

One example of an electron carrier in electron transport is

Accepted Answer

A)  ATP. 
B)  coenzyme  Q . 
C)  GTP. 
D)  citrate. 
E)  water. 
A)  ATP. 
B)  coenzyme  Q . 
C)  GTP. 
D)  citrate. 
E)  water.

Question 8

The process which combines hydrogen ions and electrons from the coenzymes with oxygen to form water is called

Accepted Answer

A) reduction. 
B) fermentation. 
C) electron transport. 
D) oxidation. 
E) decomposition. 
A) reduction. 
B) fermentation. 
C) electron transport. 
D) oxidation. 
E) decomposition.

Question 9

In electron transport, the three protein complexes (I, III, and IV)

Accepted Answer

A)  act as proton pumps, which generate a proton gradient. 
B)  act as   pumps, which generate a   gradient. 
C)  transfer electrons from FAD to   
D)  act as electron pumps, which generate an electron gradient. 
E)  transfer electrons from   
A)  act as proton pumps, which generate a proton gradient. 
B)  act as   pumps, which generate a   gradient. 
C)  transfer electrons from FAD to   
D)  act as electron pumps, which generate an electron gradient. 
E)  transfer electrons from

Question 10

One turn of the citric acid cycle produces

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four 
E)  five 
A)  one 
B)  two 
C)  three 
D)  four 
E)  five

Question 11

Under anaerobic conditions, there is a net production of ________ ATP during glycolysis.

Accepted Answer

A) zero 
B) two 
C) four 
D) six 
E) eight 
A) zero 
B) two 
C) four 
D) six 
E) eight

Question 12

In stage three of metabolism, the overall result is to release

Accepted Answer

A) glycogen and water. 
B) lactate and acetyl CoA. 
C) carbon dioxide and energy. 
D) glucose and water. 
E) lactate and glucose. 
A) glycogen and water. 
B) lactate and acetyl CoA. 
C) carbon dioxide and energy. 
D) glucose and water. 
E) lactate and glucose.

Question 13

The citric acid cycle takes place in the

Accepted Answer

A) cytoplasm. 
B) cytosol. 
C) mitochondria. 
D) endoplasmic reticulum. 
E) Golgi apparatus. 
A) cytoplasm. 
B) cytosol. 
C) mitochondria. 
D) endoplasmic reticulum. 
E) Golgi apparatus.

Question 14

When combined with electron transport, one turn of the citric acid cycle produces ________ ATP.

Accepted Answer

A) 2 
B) 14 
C) 12 
D) 10 
E) 24 
A) 2 
B) 14 
C) 12 
D) 10 
E) 24

Question 15

Which of the following is the net reaction for one turn of the citric acid cycle?

Accepted Answer

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

Question 16

Which coenzyme is used in the following reaction?

Accepted Answer

A)    
B)  FAD 
C)    
D)  NADH 
E)  FMN 
A)    
B)  FAD 
C)    
D)  NADH 
E)  FMN

Question 17

What is the correct coefficient for ATP in the complete reaction of glucose?

Accepted Answer

A) 6 
B) 32 
C) 24 
D) 18 
E) 12 
A) 6 
B) 32 
C) 24 
D) 18 
E) 12

Question 18

The components of electron transport do NOT include

Accepted Answer

A)  Cyt  c . 
B)  Complex III. 
C)  CoQ 
D)    
E)  acetyl CoA. 
A)  Cyt  c . 
B)  Complex III. 
C)  CoQ 
D)    
E)  acetyl CoA.

Question 19

In order to enter the citric acid cycle, pyruvate is first converted to

Accepted Answer

A) citrate. 
B) ethanol. 
C) acetaldehyde. 
D) acetyl CoA. 
E) oxaloacetate. 
A) citrate. 
B) ethanol. 
C) acetaldehyde. 
D) acetyl CoA. 
E) oxaloacetate.

Question 20

One method of regulation of the citric acid cycle is

Accepted Answer

A) carbon dioxide production. 
B) temperature control. 
C) water concentration. 
D) allosteric control. 
E) osmosis. 
A) carbon dioxide production. 
B) temperature control. 
C) water concentration. 
D) allosteric control. 
E) osmosis.

Exam 23: Metabolism and Energy Production

In the first reaction of the citric acid cycle,

11The citric acid cycle operates only under aerobic conditions because

The last reaction in the citric acid cycle converts malate to

Which of the following is NOT a possible product of pyruvate under anaerobic conditions?

In the chemiosmotic model, protons circulate through a protein complex called

The GTP formed in reaction 5 of the citric acid cycle is used to make

One example of an electron carrier in electron transport is

The process which combines hydrogen ions and electrons from the coenzymes with oxygen to form water is called

In electron transport, the three protein complexes (I, III, and IV)

One turn of the citric acid cycle produces

Under anaerobic conditions, there is a net production of ________ ATP during glycolysis.

In stage three of metabolism, the overall result is to release

The citric acid cycle takes place in the

When combined with electron transport, one turn of the citric acid cycle produces ________ ATP.

Which of the following is the net reaction for one turn of the citric acid cycle?

Which coenzyme is used in the following reaction?

What is the correct coefficient for ATP in the complete reaction of glucose?

The components of electron transport do NOT include

In order to enter the citric acid cycle, pyruvate is first converted to

One method of regulation of the citric acid cycle is

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