An Endergonic Reaction Can Proceed Only If It Absorbs

Question

An endergonic reaction can proceed only if it absorbs
A) randomly available free energy.
B) less free energy than is released by a coupled exergonic reaction.
C) more free energy than is released by a coupled exergonic reaction.
D) less free energy than is released by a coupled endergonic reaction.
E) the same amount of free energy that is absorbed by the enzymatic breakdown of proteins.

Accepted Answer

Endergonic reactions require an input of energy to proceed and can be coupled to exergonic reactions, where the energy released by the exergonic reaction is used to drive the endergonic reaction. For this to happen, the amount of free energy released by the exergonic reaction must be greater than the amount of free energy absorbed by the endergonic reaction.