What does ATP stand for?

• A. Adenosine monophosphate
• B. Adenosine triphosphate
• C. Adenosine diphosphate
• D. Adenosine tetraphosphate

Answer: (B)

ATP stands for adenosine triphosphate. The “adenosine” part names the base, and “triphosphate” shows there are three phosphate groups attached. This three-phosphate structure is what lets ATP store and release energy for cellular work. The other options describe related molecules with different numbers of phosphates: one phosphate is adenosine monophosphate, two are adenosine diphosphate, and tetraphosphate isn’t the standard name for ATP. So the correct form—adenosine triphosphate—accurately reflects both the adenosine unit and the three phosphate groups.