Which statement is TRUE regarding coupled reactions?
A) The standard free energy changes of the coupled reactions are additive, and their equilibrium constants are multiplicative.
B) The coupled reactions must share a common intermediate.
C) The free energy of the endergonic reaction must be greater in magnitude than the free energy of the exergonic reaction.
D) The standard free energy changes of the coupled reactions are additive, their equilibrium constants are multiplicative, and the coupled reactions must share a common intermediate.
E) None of the statements is true.

Question

Quizplus · Accepted Answer

The statement that is true regarding coupled reactions is that the standard free energy changes of the coupled reactions are additive, their equilibrium constants are multiplicative, and the coupled reactions must share a common intermediate. This is known as the principle of coupling reactions, which states that an energetically unfavorable reaction can be driven by coupling it with an energetically favorable reaction, and that the coupled reactions must share a common intermediate. The standard free energy changes of the coupled reactions are additive, meaning that the overall free energy change of the coupled reactions is the sum of the free energy changes of the individual reactions, and their equilibrium constants are multiplicative, meaning that the equilibrium constant of the overall reaction is the product of the equilibrium constants of the individual reactions.

Which Statement Is TRUE Regarding Coupled Reactions