The correct answer is phosphorous but occurs in the form of a phosphate. ATP stands for Adenosine Triphosphate.
ATP is composed of three components. At the center of the molecule is found ribose, a sugar molecule which is the very same sugar that forms part of RNA. To one side of ribose is attached a base known as adenine. This base belongs to a group of molecules made of linked rings of both carbon and nitrogen atoms.
To the other side of ribose is attached a string of phosphate groups which are key to the energy carrying activities of ATP.
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