Which of the following statements is true about the...

Name: Problem 3, Chapter :
Uploaded: 2020-12-30T19:25:03-08:00
Duration: 3 min 36 s
Channel: Dennis Howard
Description: Which of the following statements is true about the hydrolysis of ATP? (A) The free energy of ATP hydrolysis is independent of pH. (B) One mole of creatine phosphate can phosphorylate two moles of ADP. (C) The free energy of hydrolysis of ATP is nearly the same as for ADP. (D) ATP yields cyclic AMP aer two hydrolysis reactions.

Which of the following statements is true about the hydrolysis of ATP? (A) The free energy of ATP hydrolysis is independent of pH. (B) One mole of creatine phosphate can phosphorylate two moles of ADP. (C) The free energy of hydrolysis of ATP is nearly the same as for ADP. (D) ATP yields cyclic AMP aer two hydrolysis reactions.

Which of the following statements is true about the hydrolysis of ATP?
(A) The free energy of ATP hydrolysis is independent of pH.
(B) One mole of creatine phosphate can phosphorylate two moles of ADP.
(C) The free energy of hydrolysis of ATP is nearly the same as for ADP.
(D) ATP yields cyclic AMP aer two hydrolysis reactions.

Key Concepts

ATP Hydrolysis Free Energy

This concept refers to the energy released when ATP is hydrolyzed into ADP and inorganic phosphate. The reaction is exergonic, meaning it releases free energy that can drive endergonic processes, and the magnitude of this free energy change depends on several factors such as the concentrations of reactants and products, magnesium ion binding, and pH.

pH Dependence of Biochemical Reactions

The pH of a solution can significantly affect the energetics of biochemical reactions, including ATP hydrolysis. pH influences the ionization state of molecules and ions involved, thereby affecting equilibrium constants and the free energy change. This is why the free energy of ATP hydrolysis can vary with pH.

Phosphoryl Transfer Reactions

These reactions involve the transfer of a phosphate group from a donor molecule, like ATP or creatine phosphate, to an acceptor, such as ADP. Understanding the stoichiometry and mechanism of these transfers is crucial, as exemplified by the fact that a molecule like creatine phosphate typically transfers only one phosphate group per molecule.

Signal Transduction via cyclic AMP

Cyclic AMP is an important second messenger in cellular signaling pathways. It is produced from ATP by the enzyme adenylyl cyclase in response to various stimuli. This process involves a cyclization reaction rather than a simple sequential double hydrolysis, highlighting a different mechanism from typical ATP hydrolysis reactions.

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