Question

Energy is released to be used by a cell when a phosphate group is

A) removed from ADP to form ATP

B) added to ADP to form ATP

C) removed from ATP to form ADP

D) added to ATP to form ADP

Answer 1

The correct answer is C.
Energy is released to be used by a cell when a phosphate group is removed from ATP to form ADP.  

ATP hydrolysis is a process in which the chemical energy is released from the high-energy molecule-ATP (adenosine triphosphate).

Answer 2

Answer:

C

Explanation:

ATP is an abbreviation of the molecule adenosine triphosphate.

ADP is an abbreviation of the molecule adenosine diphosphate.

A phosphate bond is an extremely high energy bond, meaning a lot of energy is required to form such a bond, and breaking such a bond would result in the release of a lot of energy.

ATP has three phosphates, while ADP only has two, and hence a release in energy would be the result of removing a phosphate from an ATP molecule to form ADP.