How is energy stored in ATP?

Question

a. ADP is given a third phosphate group, which stores energy in the bond.
b. ADP is given energy from glucose until it has enough energy to become ATP.
c. ADP loses one phosphate group leaving it with more energy.
d. ADP loses its extra energy to ATP with the help of glucose.
I know that ATP is released by breaking the chemical bond between the second and third phosphates. So, it adds a phosphate group to ADP to become ATP.

Answer 1

The correct answer is:

a. ADP is given a third phosphate group, which stores energy in the bond.

ATP (adenosine triphosphate) stores energy in the high-energy bonds between its phosphate groups. When ATP is synthesized from ADP (adenosine diphosphate) and an inorganic phosphate (Pi), energy is stored in the bond formed when the third phosphate group is added to ADP. This energy can later be released when ATP is converted back to ADP by breaking the bond between the second and third phosphate groups.