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Chapter 14: Q 25P (page 476)

Question:Does the magnitude of the free energy change for ATP hydrolysis increase or decrease as the pH increases from 5 to 6?

Short Answer

Expert verified

Answer

The amount of change in free energy grows.

Step by step solution

01

Step-by-step-solutionStep 1: Definition of ATP hydrolysis

Adenosine triphosphate (ATP) hydrolysis is a catabolic reaction process through which chemical energy that has been stored in the high-energy phosphoanhydride bonds in ATP is released after these bonds have been broken, for example in muscles, by generating work in the form of mechanical energy.

02

Step 2:Explanation whether the magnitude of free energy change increases or decreases

The size of the free energy shift increases with the propensity of ATP for hydrolysis. At pH5, there are more bonded hydrogen atoms, which enhances their charge-induced repulsion.

As repulsion grows, hydrolysis becomes more advantageous and the amount of free energy change increases, becoming more negative.

Therefore, the magnitude of free energy change increases.

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Most popular questions from this chapter

Citrate synthase catalyses the reaction

Oxaloacetate+acetyl-CoA鈫�citrate+HS-CoA

The standard free energy change for the reaction is role="math" localid="1660738017563" -31.5kJ路mol-1. (a) Calculate the equilibrium constant for this reaction at 37oC. (b) Would you expect this reaction to serve as a control point for its pathway (the citric acid cycle)?

A hypothetical three-step metabolic pathway consists of intermediates W, X, Y, and Z and enzymes A, B, and C. Deduce the order of the enzymatic steps in the pathway from the following information:

1. Compound Q, a metabolic inhibitor of enzyme B, causes Z to build up.

2. A mutant in enzyme C requires Y for growth.

3. An inhibitor of enzyme A causes W, Y, and Z to accumulate.

4. Compound P, a metabolic inhibitor of enzyme C, causes W and Z to build up.

What are the metabolic roles of the coenzymes NAD+ and FAD?

Question: Is the reduced form of cytochrome c more likely to give up its electron to oxidized cytochrome a or cytochrome b?

Question: Aerobic organisms transfer electrons from reduced fuel molecules to O2, forming H2O . Some anaerobic organisms use nitrate (NO2)as an acceptor for electrons from reduced fuel molecules. Use the information in Table 14-4 to explain why aerobic organisms can harvest more free energy from a fuel molecule than can a nitrate-using anaerobe.
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