ALEKS 360 ACCESS CARD F/GEN. ORG.CHEM
ALEKS 360 ACCESS CARD F/GEN. ORG.CHEM
3rd Edition
ISBN: 9781264452545
Author: SMITH
Publisher: MCG
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Chapter 23, Problem 23.33P
Interpretation Introduction

(a)

Interpretation:

The equation for the coupled reaction of 1,3-bisphosphoglycerate with ADP to form 3-phosphoglycerate and ATP should be written.

Concept Introduction:

Phosphorylation of 1,3-bisphosphoglycerate is energetically unfavorable reaction. By coupling with the ATP hydrolysis, this reaction can be converted to a favorable state.

Expert Solution
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Answer to Problem 23.33P

  1,3-bisphosphoglycerate+ADP  3-phosphoglycerate+ATP

Explanation of Solution

The conversion of 1,3-bisphosphatoglycerate to 3-phosphoglycerate and hydrogen phosphate can be represented as follows:

  1,3-bisphosphoglycerate + H2O         3-phosphoglycerate + HPO42.......(1)

Similarly, the conversion of ATP to ADP can be represented as follows:

  ATP + H2ADP + HPO42.......(2)

To cancel the common species, reaction (1) should be added to the reverse of reaction (2).

The coupled reaction can be represented as follows:

  1,3-bisphosphoglycerate + H2O      3-phosphoglycerate + HPO42                          ADP + HPO42ATP + H2O 1,3-bisphosphoglycerate+ADP   3-phosphoglycerate +ATP _¯

  

Interpretation Introduction

(b)

Interpretation:

The energy change for this coupled reaction should be calculated.

Concept Introduction:

Phosphorylation of 1,3-bisphosphoglycerate is energetically unfavorable reaction. by coupling with the ATP hydrolysis, this reaction can be converted to a favorable state.

In the hydrolysis of ATP breaks one phosphate group, forming ADP and hydrogen phosphate, This reaction releases 7.3 kcal/mol of energy.

When the energy of a reaction is a positive value, that reaction is an endothermic reaction and it requires the energy of surrounding to complete the reaction.

When the energy of a reaction is a negative value, that reaction is exothermic, and it releases energy by acting as an energetically favorable reaction.

Expert Solution
Check Mark

Answer to Problem 23.33P

- 4.5kcal/mol

Explanation of Solution

The conversion of 1,3-bisphosphatoglycerate to 3-phosphoglycerate and hydrogen phosphate can be represented as follows:

  1,3-bisphosphoglycerate + H2O         3-phosphoglycerate + HPO42.......(1)

The energy for the above reaction is  - 11.8 kacal/mol.

Similarly, the conversion of ATP to ADP can be represented as follows:

ATP + H2ADP + HPO42.........(2)

The energy for the above reaction is  -7.3 kcal/mol.

To cancel the common species, reaction (1) should be added to the reverse of reaction (2).

The coupled reaction can be represented as follows:

  1,3-bisphosphoglycerate + H2O      3-phosphoglycerate + HPO42   - 11.8 kcal/mol                          ADP + HPO42ATP + H2O                                   +7.3 kcal/mol                         1,3-bisphosphoglycerate+ADP   3-phosphoglycerate +ATP            4.5 kcal/mol                       _¯

Thus, the energy change for the reaction is  4.5 kcal/mol    .

Interpretation Introduction

(c)

Interpretation:

Whether this reaction is used to synthesize ATP from ADP should be explained.

Concept Introduction:

The reaction releases 7.3 kcal/mol of energy.

When the energy of a reaction is a positive value, that reaction is an endothermic reaction and it requires the energy of surrounding to complete the reaction.

When the energy of a reaction is a negative value, that reaction is exothermic, and it releases energy by acting as an energetically favorable reaction.

Expert Solution
Check Mark

Answer to Problem 23.33P

This can be used to produce ATP.

Explanation of Solution

  ATP + H2ADP + HPO42                                 -7.3 kcal/mol1,3-bisphosphoglycerate + H2O          3-phosphoglycerate + HPO42      - 11.8 kacal/mol1,3-bisphosphoglycerate+ADP   3-phosphoglycerate+ATP

Energy = -11.8 kcal/mol + 7.3 kcal/mol = - 4.5kcal/mol

When the energy of a reaction is a negative value, that reaction is exothermic, and it releases energy by acting as an energetically favorable reaction. Therefore, this can be used to produce ATP.

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Chapter 23 Solutions

ALEKS 360 ACCESS CARD F/GEN. ORG.CHEM

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