well this will be related to both chemistry and biology
what i know about chemistry-
breaking bonds is an endothermic reaction
building up bonds is an exothermic reaction
what i learnt from biology- ADP and ATP
(well, can i assume the people here know about ADP and ATP?)
to attach a Pi to ADP requires energy
to detach a Pi from ATP to form an ADP gives out energy
is there a contradiction between chemistry and biology or i took any of them wrongly?
8)