What is energy coupling?
a) the hydrolysis of ATP to ADP + P
b) the use of energy released from an exergonic process to drive an endergonic process
c) the energetic relationship between the reactants and products in an exergonic reaction
the answer is b. For example, nuclear fusion in the sun (an exergonic process) releases energy as light and heat, and powers the initial steps of photosynthesis (an endergonic process).