Question

How is the energy that is carried in an ATP molecule released to provide usable energy?

A) A sugar ring attaches to the ATP molecule
B) A phosphate group attaches to the ATP molecule
C) The sugar ring breaks way from the ATP molecule 
D) The bond holding the last phosphate group breaks

Answer 1

The best answer is by breaking off a phosphate group from its structure.

ATP adenosine tri phosphate. It has three phosphate group attached to adenosine, hence the prefix "tri" for three.

During metabolism, a phosphate group is removed from ATP and energy is released for use by the cell. When this happens, ATP becomes ADP or adenosine di phosphate, "di" meaning two, i.e. adenosine remains with two phosphate groups. ADP is the core component of ATP.

A phosphate group is added again to ADP to make it ATP which is the form in which energy in the cell is temporarily stored before the whole process is repeated again

Answer 2

The ATP molecule contains three phosphate molecule attached with the adenosine with bonds between them. Hence the energy released by the ATP molecule is produced by the breaking of the bonds holding the last phosphate group. Hence the correct answer is option D.