Question 1

Many cells oxidize fatty acids to produce ATP.If no ATP were produced,the DG° of this process would be

Accepted Answer

A)  unchanged 
B)  a larger positive number 
C)  a larger negative number 
D)  impossible to determine 
A)  unchanged 
B)  a larger positive number 
C)  a larger negative number 
D)  impossible to determine

Question 2

In biological redox reactions,hydrogen ions are usually transferred along with electrons.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following coenzymes is not a carrier of electrons in biological redox reactions?

Accepted Answer

A)  Coenzyme A 
B)  Niacin. 
C)  Riboflavin. 
D)  Transition metal ions, such as those of iron or copper. 
E)  All of these can be intermediate electron carriers. 
A)  Coenzyme A 
B)  Niacin. 
C)  Riboflavin. 
D)  Transition metal ions, such as those of iron or copper. 
E)  All of these can be intermediate electron carriers.

Question 4

Which of the following are examples of endergonic processes?

Accepted Answer

A)  protein synthesis and active transport 
B)  protein synthesis and oxidation of carbohydrates 
C)  active transport and oxidation of carbohydrates 
D)  oxidation of fats and of carbohydrates 
A)  protein synthesis and active transport 
B)  protein synthesis and oxidation of carbohydrates 
C)  active transport and oxidation of carbohydrates 
D)  oxidation of fats and of carbohydrates

Question 5

The energy released during metabolism of nutrients can be used to synthesize ATP from ADP and phosphate.

Accepted Answer

A) True 
 B)False

Question 6

The oxidation of nutrients supplies the energy to produce ATP.

Accepted Answer

A) True 
 B)False

Question 7

"Metabolism" refers to

Accepted Answer

A)  the breakdown of larger molecules into smaller ones. 
B)  the production of larger molecules from smaller ones. 
C)  both of these 
D)  none of these 
A)  the breakdown of larger molecules into smaller ones. 
B)  the production of larger molecules from smaller ones. 
C)  both of these 
D)  none of these

Question 8

Metabolism takes place in stages

Accepted Answer

A)  because enzymes cannot catalyze the process efficiently 
B)  and allows for efficient production and use of energy 
C)  because large free energy changes cannot occur in living organisms 
D)  to use highly unreactive compounds 
A)  because enzymes cannot catalyze the process efficiently 
B)  and allows for efficient production and use of energy 
C)  because large free energy changes cannot occur in living organisms 
D)  to use highly unreactive compounds

Question 9

What happens to the entropy when ATP is hydrolysed to ADP?

Accepted Answer

A)  Entropy increases 
B)  Entropy decreases. 
C)  Entropy doesn't change. 
D)  ATP has no entropy. 
A)  Entropy increases 
B)  Entropy decreases. 
C)  Entropy doesn't change. 
D)  ATP has no entropy.

Question 10

I am performing a reaction,A B,with DG° = -5000 kJ/mol.I start the reaction with 10 mM A and no B. After allowing the reaction to proceed for 24 hrs at room temperature and atmospheric pressure,I analyze a sample of the reaction mix to find I now have 8 mM A and 2 mM B.Which of the following conclusions should I make?

Accepted Answer

A) The reaction has reached equilibrium. 
B) I should come back again later; equilibrium has not yet been reached. 
C) The formation of B from A is thermodynamically unfavorable,so I should find another starting material to make B. 
D) I must've screwed up; there's no way I could get that result with that D° 
A) The reaction has reached equilibrium. 
B) I should come back again later; equilibrium has not yet been reached. 
C) The formation of B from A is thermodynamically unfavorable,so I should find another starting material to make B. 
D) I must've screwed up; there's no way I could get that result with that D°

Question 11

What happens to the entropy of a molecule as the number of resonance structures increases?

Accepted Answer

A)  Entropy also increases. 
B)  Entropy decreases. 
C)  Entropy has no relationship to the number of resonance structures. 
A)  Entropy also increases. 
B)  Entropy decreases. 
C)  Entropy has no relationship to the number of resonance structures.

Question 12

Which of the following statements concerning the free energy change (DG) is false?

Accepted Answer

A)  The energy change for a reaction depends only on the initial and final states, and is independent of the path taken. 
B)  The overall energy change for a reaction could be calculated by summing the energy changes for a series of separate reactions that could convert the reactants to the products. 
C)  The rate of a reaction can be determined from the energy change. 
D)  The energy change is a function of the concentrations of the products and reactants at start. 
A)  The energy change for a reaction depends only on the initial and final states, and is independent of the path taken. 
B)  The overall energy change for a reaction could be calculated by summing the energy changes for a series of separate reactions that could convert the reactants to the products. 
C)  The rate of a reaction can be determined from the energy change. 
D)  The energy change is a function of the concentrations of the products and reactants at start.

Question 13

In general,catabolism

Accepted Answer

A)  releases energy. 
B)  absorbs energy. 
C)  neither absorbs nor releases energy. 
A)  releases energy. 
B)  absorbs energy. 
C)  neither absorbs nor releases energy.

Question 14

Consider this rxn which has a DG° = +0.4 kJ/mol. A + B « C + D
1 M A,1 M B,0.1 M C and 0.1 M D are added to a container at room temperature.Which of the following statements is true?

Accepted Answer

A)  The reaction will proceed in the forward direction to reach equilibrium. 
B)  The reaction will proceed in the backward direction to reach equilibrium. 
C)  The reaction will not proceed in either direction; it is already at equilibrium. 
D)  Cannot be determined from the information provided. 
A)  The reaction will proceed in the forward direction to reach equilibrium. 
B)  The reaction will proceed in the backward direction to reach equilibrium. 
C)  The reaction will not proceed in either direction; it is already at equilibrium. 
D)  Cannot be determined from the information provided.

Question 15

Consider this rxn which has a DG° = +0.4 kJ/mol. A + B « C + D
1 M A,1 M B,0.1 M C and 0.1 M D are added to a container at room temperature.Which of the following statements is true?

Accepted Answer

A)  DG  0 (i.e., it's positive) 
D)  Cannot be determined from the information provided. 
A)  DG  0 (i.e., it's positive) 
D)  Cannot be determined from the information provided.

Question 16

The efficiency of aerobic metabolism is greater than that of anaerobic metabolism even though much more energy is released in aerobic than in anaerobic metabolism because

Accepted Answer

A)  aerobic metabolism is linked to oxygen, which is a more powerful oxidizing agent than those in anaerobic metabolism 
B)  aerobic metabolism produces carbon dioxide and water 
C)  aerobic metabolism traps much more energy in the form of ATP than does anaerobic metabolism 
D)  anaerobic metabolism produces two- and three-carbon compounds 
A)  aerobic metabolism is linked to oxygen, which is a more powerful oxidizing agent than those in anaerobic metabolism 
B)  aerobic metabolism produces carbon dioxide and water 
C)  aerobic metabolism traps much more energy in the form of ATP than does anaerobic metabolism 
D)  anaerobic metabolism produces two- and three-carbon compounds

Question 17

The standard state of a solution is taken as

Accepted Answer

A)  1 atmosphere of pressure. 
B)  the pure solute. 
C)  1 molar concentration. 
D)  none of the above. 
A)  1 atmosphere of pressure. 
B)  the pure solute. 
C)  1 molar concentration. 
D)  none of the above.

Question 18

Which of the following is not a part of FAD?

Accepted Answer

A)  Ribitol 
B)  isoalloxazine 
C)  adenine 
D)  ribose 
E)  nicotinamide 
A)  Ribitol 
B)  isoalloxazine 
C)  adenine 
D)  ribose 
E)  nicotinamide

Question 19

In general,catabolism

Accepted Answer

A)  is an oxidative process that releases energy 
B)  is a reductive process that releases energy 
C)  is an oxidative process that requires energy 
D)  is a reductive process that requires energy 
E)  none of these 
A)  is an oxidative process that releases energy 
B)  is a reductive process that releases energy 
C)  is an oxidative process that requires energy 
D)  is a reductive process that requires energy 
E)  none of these

Question 20

Which of the following coenzymes is derived from riboflavin?

Accepted Answer

A)  Coenzyme A 
B)  NAD+. 
C)  FAD 
D)  All of the above. 
E)  None of the above. 
A)  Coenzyme A 
B)  NAD+. 
C)  FAD 
D)  All of the above. 
E)  None of the above.

Exam 15: The Importance of Energy Changes and Electron Transfer in Metabolism

Many cells oxidize fatty acids to produce ATP.If no ATP were produced,the DG° of this process would be

In biological redox reactions,hydrogen ions are usually transferred along with electrons.

Which of the following coenzymes is not a carrier of electrons in biological redox reactions?

Which of the following are examples of endergonic processes?

The energy released during metabolism of nutrients can be used to synthesize ATP from ADP and phosphate.

The oxidation of nutrients supplies the energy to produce ATP.

"Metabolism" refers to

Metabolism takes place in stages

What happens to the entropy when ATP is hydrolysed to ADP?

What happens to the entropy of a molecule as the number of resonance structures increases?

Which of the following statements concerning the free energy change (DG) is false?

In general,catabolism

Consider this rxn which has a DG° = +0.4 kJ/mol. A + B « C + D 1 M A,1 M B,0.1 M C and 0.1 M D are added to a container at room temperature.Which of the following statements is true?

Consider this rxn which has a DG° = +0.4 kJ/mol. A + B « C + D 1 M A,1 M B,0.1 M C and 0.1 M D are added to a container at room temperature.Which of the following statements is true?

The efficiency of aerobic metabolism is greater than that of anaerobic metabolism even though much more energy is released in aerobic than in anaerobic metabolism because

The standard state of a solution is taken as

Which of the following is not a part of FAD?

In general,catabolism

Which of the following coenzymes is derived from riboflavin?

Biochemistry and the Organization of Cells

Water: The Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three-Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins: Enzymes

The Behavior of Proteins: Enzymes, Mechanisms, and Control

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids: How Structure Conveys Information

Biosynthesis of Nucleic Acids: Replication

Transcription of the Genetic Code: Biosynthesis of Rna

Protein Synthesis: Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses, Cancer, and Immunology

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism: Cellular Signaling

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