Final answer:
The high-energy bond in ATP happens between the second and third phosphate groups and between the first and second phosphate groups.
Step-by-step explanation:
ATP molecules consist of an adenine, a ribose, and three phosphate groups. The high-energy bond in ATP happens between the second and third phosphate groups and between the first and second phosphate groups.
When this bond is broken through hydrolysis, ADP and a phosphate group are formed, releasing a significant amount of energy.