Question

What is the purpose of Coupled Reactions?

Answer 1

1. A coupling reaction is the reaction in which two fragments are joined together to form a new compound.
2. Example- When phenol is reacted with a diazonium salt to form p-Hydroxyaxobenzene which is an orange dye.

1. These coupled reactions help ATP molecules to generate a common intermediate. Due to which ATP cleavage (transfer of Phosphate molecule from one ATP molecule to another ATP molecule) to form ADP + P.
2. By coupling the exergonic reaction of ATP hydrolysis with endergonic reactions, ATP is used by the cells to conduct any function by a mechanism known as phosphorylation, ATP donates the phosphate group to another molecule.
3. In coupled reactions, $-∆\mathrm{G}>∆\mathrm{G}$ means free energy released for the exergonic reaction is greater than the endergonic reaction.