AP BIOLOGY

Detailed explanation-1: -The formation of ATP by condensation between ADP and inorganic phosphate is a highly endothermic reaction.

Detailed explanation-2: -Reactions that produce energy, like ATP hydrolysis, are referred to as exothermic reactions (or sometimes exergonic, meaning roughly the same thing).

Detailed explanation-3: -During various cellular activities, the energy released by the breakdown of ATP is used to drive endothermic reactions in the cell.

Detailed explanation-4: -ATP consists of an adenosine molecule bonded to three phosphate groups in a row. During cellular respiration, energy in food is converted into chemical energy that can be used by cells. This chemical energy is stored in the pyrophosphate bond, which lies between the last two phosphate groups of ATP.