Reactions can be coupled to each other; for example hydrolyzing ATP can be coupled to phosphorylating glucose. When reactions are coupled
a. the energy released by an exergonic reaction is used by the endergonic reaction.
b. endergonic reactions are changed to exergonic reactions.
c. exergonic reactions are changed to endergonic reactions.
d. the energy released by an endergonic reaction is used by the exergonic reaction.
e. the activation energy of each reaction is increased.