Which of the following processes releases energy to be used by a cell?
A: A phosphate group is added to ATP to form ADP.
B: A phosphate group is removed from ADP to form ATP.
C: A phosphate group is added to ADP to form ATP.
D:A phosphate group is removed from ATP to form ADP.
The answer is “C.” ADP stands for adenosine diphosphate—di meaning two. When you add an extra phosphate, the di becomes tri (2 to 3). Therefore, adenosine TRIphosphate, or ATP, is released from cellular respiration.
