ATP is
A) an enzyme used widely in all kinds of cells.
B) a driver of both sides of the coupled reaction that forms ADP.
C) a molecule that carries a great deal of chemical energy between the terminal two phosphate bonds.
D) the building block of all other cell structures.

Question

Quizplus · Accepted Answer

ATP (adenosine triphosphate) is a molecule that is used by cells to carry and transfer energy. It is composed of a nitrogenous base (adenine), a sugar (ribose), and three phosphate groups. The bonds between the phosphate groups contain a high amount of potential energy, and when these bonds are broken, energy is released for cellular reactions. Therefore, ATP carries a great deal of chemical energy between the terminal two phosphate bonds.

Option A is incorrect because ATP is not an enzyme, but rather a molecule.

Option B is incorrect because the formation of ADP (adenosine diphosphate) from ATP is an exergonic reaction that releases energy, and not a coupled reaction.

Option D is incorrect because ATP is not the building block of all other cell structures, but rather a molecule that provides energy for cellular processes.

ATP Is