Question 1

Which atom is the MOST electronegative?

Accepted Answer

A)   C
B)   N
C)   P
D)   O
E)   S

Question 2

What is the equilibrium constant for a reaction with a standard free-energy change of +25kJ/mol?

Accepted Answer

A)   -1.1
B)   -10.1
C)   4.1 × 10-5
D)   10.1
E)   2.4 × 104

Question 3

What is the difference between $\Delta$G and $\Delta$G'° of a chemical reaction? Describe, quantitatively, the relationship between them.

Accepted Answer

The difference between

G and

G'° in a ch...

Question 4

When a mixture of 3-phosphoglycerate and 2-phosphoglycerate is incubated at 25 °C with phosphoglycerate mutase until equilibrium is reached, the final mixture contains six times as much 2-phosphoglycerate as 3-phosphoglycerate. Which statement is MOST nearly correct, when applied to the reaction as written? (R = 8.315 J/mol · K; T = 298 K)  3-phosphoglycerate  →\rightarrow→  2-phosphoglycerate

Accepted Answer

A)    Δ\DeltaΔ G'° is -4.44 kJ/mol.
B)    Δ\DeltaΔ G'° is zero.
C)    Δ\DeltaΔ G'°is +12.7 kJ/mol.
D)    Δ\DeltaΔ G'°is incalculably large and positive.
E)    Δ\DeltaΔ G'° cannot be calculated from the information given.

Question 5

The immediate precursors of DNA and RNA synthesis in the cell all contain:

Accepted Answer

A)   3' triphosphates.
B)   5' triphosphates.
C)   adenine.
D)   deoxyribose.
E)   ribose.

Question 6

Which phosphorylated amino acid is used by invertebrates in a similar manner that vertebrates use phosphocreatine?

Accepted Answer

A)   phosphocysteine
B)   phosphoarginine
C)   phosphohistidine
D)   phosphoaspartate
E)   phosphotyrosine

Question 7

Which statement is always TRUE for  Δ\DeltaΔ G'?

Accepted Answer

A)   The temperature is 25°C.
B)   The pH is 7.0.
C)   The value for  Δ\DeltaΔ G' is a constant.
D)   The initial concentration of each component is 1.0 M.
E)   The pressure is 1 atm.

Question 8

Explain the relationships among the change in the degree of order, the change in entropy, and the change in free energy that occur during a chemical reaction.

Accepted Answer

The relationships among the change in th...

Question 9

What is an oxidation? What is a reduction? Can an oxidation occur without a simultaneous reduction? Why or why not?

Accepted Answer

Oxidation is a chemical reaction in whic...

Question 10

The value of $\Delta$G'o for the hydrolysis of a phosphoanhydride in ATP bonds becomes a larger negative number with increasing pH above 7.0. Explain why this occurs.

Accepted Answer

The hydrolysis of a phosphoanhydride in ...

Question 11

ATP $\rightarrow$ ADP + Pi
$\Delta$G'° = -30.5 kJ/mol

Accepted Answer

The input question seems to be a mix of ...

Question 12

Which statement is TRUE about oxidation-reduction reactions?

Accepted Answer

A)   They usually proceed through homolytic cleavage.
B)   During oxidation a compound gains electrons.
C)   Dehydrogenases typically remove two electrons and two hydrides.
D)   There are four commonly accessed oxidation states of carbon.
E)   Every oxidation must be accompanied by a reduction.

Question 13

Which item is NOT nucleophilic?

Accepted Answer

A)   a proton
B)   a carbanion
C)   an imidazole
D)   a hydroxide
E)   a carboxylic acid

Question 14

The standard free energy change ($\Delta$G'°) for ATP hydrolysis is -30.5 kJ/mol. ATP, ADP, and Pi are mixed together at initial concentrations of 1 M of each, then left alone until the reaction ADP + Pi $\rightarrow$ ATP has come to equilibrium. For each species (i.e., ATP, ADP, and Pi), indicate whether the concentration will be equal to 1 M, less than 1 M, or greater than 1 M.

Accepted Answer

The standard free energy change (ΔG°) fo...

Question 15

If a 0.1 M solution of glucose 1-phosphate is incubated with a catalytic amount of phospho-glucomutase, the glucose 1-phosphate is transformed to glucose 6-phosphate until equilibrium is reached. At equilibrium, the concentration of glucose 1-phosphate is 4.5 × 10-3 M and that of glucose 6-phosphate is 8.6 × 10-2 M. Set up the expressions for the calculation of Keq' and $\Delta$G'° for this reaction (in the direction of glucose 6-phosphate formation). (R = 8.315 J/mol · K; T = 298 K)

Accepted Answer

To calculate the equilibrium constant (K...

Question 16

The first law of thermodynamics states that the amount of energy in the universe is constant, but that the various forms of energy can be interconverted. Describe four different types of such energy transduction that occur in living organisms and provide one example for each.

Accepted Answer

1. Chemical to Mechanical Energy Transdu...

Question 17

Which conjugate redox pair is involved in biological oxidations?

Accepted Answer

A)   Fe2+ and Fe3+
B)   NADP+ and NAD+
C)   FMN and FADH2
D)   succinate and fumarate
E)   both Fe2+ and Fe3+ and succinate and fumarate

Question 18

Biological oxidation-reduction reactions never involve:

Accepted Answer

A)   transfer of e- from one molecule to another.
B)   formation of free e-.
C)   transfer of H+ (or H3O+)  from one molecule to another.
D)   formation of free H+ (or H3O+) .
E)   None of the answers is correct.

Question 19

Which statement is TRUE for the equilibrium constant?

Accepted Answer

A)   The equilibrium constant is independent of the initial concentrations of reactants and products.
B)   When the equilibrium constant is greater than one, the standard free energy change for the reaction favors production of reactants.
C)   The equilibrium constant does not vary with changes in pH.
D)   The equilibrium constant does not vary with changes in temperature.
E)   A relatively small change in the equilibrium constant is associated with a large change in the standard free-energy change.

Question 20

Which amino acid can participate in nucleophilic catalysis?

Accepted Answer

A)   His
B)   Cys
C)   Tyr
D)   All of the answers are correct.
E)   None of the answers is correct.

Exam 13: Bioenergetics and Biochemical Reaction Types

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The standard free energy change (ΔG°) fo...
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Which statement is TRUE about oxidation-reduction reactions?

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The value of $\Delta$ G'^o for the hydrolysis of a phosphoanhydride in ATP bonds becomes a larger negative number with increasing pH above 7.0. Explain why this occurs.

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The hydrolysis of a phosphoanhydride in ...
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Which phosphorylated amino acid is used by invertebrates in a similar manner that vertebrates use phosphocreatine?

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ATP $\rightarrow$ ADP + P_i $\Delta$ G'° = -30.5 kJ/mol

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The input question seems to be a mix of ...
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The immediate precursors of DNA and RNA synthesis in the cell all contain:

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Which atom is the MOST electronegative?

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Biological oxidation-reduction reactions never involve:

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The first law of thermodynamics states that the amount of energy in the universe is constant, but that the various forms of energy can be interconverted. Describe four different types of such energy transduction that occur in living organisms and provide one example for each.

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1. Chemical to Mechanical Energy Transdu...
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What is an oxidation? What is a reduction? Can an oxidation occur without a simultaneous reduction? Why or why not?

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Oxidation is a chemical reaction in whic...
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To calculate the equilibrium constant (K...
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What is the difference between $\Delta$ G and $\Delta$ G'° of a chemical reaction? Describe, quantitatively, the relationship between them.

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The difference between G and G'° in a ch...
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What is the equilibrium constant for a reaction with a standard free-energy change of +25kJ/mol?

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Which item is NOT nucleophilic?

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Which amino acid can participate in nucleophilic catalysis?

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Which conjugate redox pair is involved in biological oxidations?

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Which statement is always TRUE for $\Delta$ G'?

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Which statement is TRUE for the equilibrium constant?

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Explain the relationships among the change in the degree of order, the change in entropy, and the change in free energy that occur during a chemical reaction.

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The relationships among the change in th...
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Exam 13: Bioenergetics and Biochemical Reaction Types

Correct AnswerAnswered by ExamLex AIThe standard free energy change (ΔG°) fo...View AnswerShow Answer

Which statement is TRUE about oxidation-reduction reactions?

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The value of Δ\DeltaΔ G'o for the hydrolysis of a phosphoanhydride in ATP bonds becomes a larger negative number with increasing pH above 7.0. Explain why this occurs.

Correct AnswerAnswered by ExamLex AIThe hydrolysis of a phosphoanhydride in ...View AnswerShow Answer

Which phosphorylated amino acid is used by invertebrates in a similar manner that vertebrates use phosphocreatine?

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ATP →\rightarrow→ ADP + Pi Δ\DeltaΔ G'° = -30.5 kJ/mol

Correct AnswerAnswered by ExamLex AIThe input question seems to be a mix of ...View AnswerShow Answer

The immediate precursors of DNA and RNA synthesis in the cell all contain:

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Which atom is the MOST electronegative?

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Biological oxidation-reduction reactions never involve:

Correct AnswerverifiedShow Answer

The first law of thermodynamics states that the amount of energy in the universe is constant, but that the various forms of energy can be interconverted. Describe four different types of such energy transduction that occur in living organisms and provide one example for each.

Correct AnswerAnswered by ExamLex AI1. Chemical to Mechanical Energy Transdu...View AnswerShow Answer

What is an oxidation? What is a reduction? Can an oxidation occur without a simultaneous reduction? Why or why not?

Correct AnswerAnswered by ExamLex AIOxidation is a chemical reaction in whic...View AnswerShow Answer

Correct AnswerAnswered by ExamLex AITo calculate the equilibrium constant (K...View AnswerShow Answer

What is the difference between Δ\DeltaΔ G and Δ\DeltaΔ G'° of a chemical reaction? Describe, quantitatively, the relationship between them.

Correct AnswerAnswered by ExamLex AIThe difference between G and G'° in a ch...View AnswerShow Answer

What is the equilibrium constant for a reaction with a standard free-energy change of +25kJ/mol?

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Which item is NOT nucleophilic?

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Which amino acid can participate in nucleophilic catalysis?

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Which conjugate redox pair is involved in biological oxidations?

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Which statement is always TRUE for Δ\DeltaΔ G'?

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Which statement is TRUE for the equilibrium constant?

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Explain the relationships among the change in the degree of order, the change in entropy, and the change in free energy that occur during a chemical reaction.

Correct AnswerAnswered by ExamLex AIThe relationships among the change in th...View AnswerShow Answer

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Correct Answer
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The standard free energy change (ΔG°) fo...
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Correct Answer
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The value of $\Delta$ G'^o for the hydrolysis of a phosphoanhydride in ATP bonds becomes a larger negative number with increasing pH above 7.0. Explain why this occurs.

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Answered by ExamLex AI
The hydrolysis of a phosphoanhydride in ...
View Answer

Correct Answer
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ATP $\rightarrow$ ADP + P_i $\Delta$ G'° = -30.5 kJ/mol

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The input question seems to be a mix of ...
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
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1. Chemical to Mechanical Energy Transdu...
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Correct Answer
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Oxidation is a chemical reaction in whic...
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To calculate the equilibrium constant (K...
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What is the difference between $\Delta$ G and $\Delta$ G'° of a chemical reaction? Describe, quantitatively, the relationship between them.

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The difference between G and G'° in a ch...
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Which statement is always TRUE for $\Delta$ G'?

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The relationships among the change in th...
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