How many phosphate groups are present in one molecule of ATP?

Adenosine triphosphate (ATP) is a molecule composed of three phosphate groups attached to a ribose sugar, which in turn is attached to an adenine base. The name "triphosphate" itself indicates the presence of three phosphate groups. These phosphate groups are key for the storage and transfer of energy within cells. When one of the phosphate groups is hydrolyzed, energy is released for biological processes.

In contrast, other options refer to a different number of phosphate groups and do not accurately reflect the structure of ATP, which is why they are not the correct answer. Understanding the significance of these three phosphate groups helps clarify how ATP functions as the primary energy currency in cellular metabolism.