ADP stands for Adenosine Diphosphate.

ADP stands for Adenosine Diphosphate.

• A. Adenosine Monophosphate
• B. Adenosine Diphosphate
• C. Adenosine Tetraphosphate
• D. Adenosine Triphosphate

Answer: (B)

ADP stands for Adenosine Diphosphate, which means the molecule is adenosine with two phosphate groups attached. This two-phosphate form is a common energy-carrying state that sits between ATP (three phosphates) and AMP (one phosphate) in cellular energy turnover. Energy is released when ATP donates a phosphate and becomes ADP (and inorganic phosphate), powering many cellular processes. ADP can be recharged back to ATP by adding a phosphate group, using energy from metabolism. The other options describe different molecules: one phosphate would be Adenosine Monophosphate, four phosphates would be Adenosine Tetraphosphate (not typically used as a cellular energy carrier), and three phosphates is Adenosine Triphosphate, the high-energy form.

ADP stands for Adenosine Diphosphate, which means the molecule is adenosine with two phosphate groups attached. This two-phosphate form is a common energy-carrying state that sits between ATP (three phosphates) and AMP (one phosphate) in cellular energy turnover. Energy is released when ATP donates a phosphate and becomes ADP (and inorganic phosphate), powering many cellular processes. ADP can be recharged back to ATP by adding a phosphate group, using energy from metabolism. The other options describe different molecules: one phosphate would be Adenosine Monophosphate, four phosphates would be Adenosine Tetraphosphate (not typically used as a cellular energy carrier), and three phosphates is Adenosine Triphosphate, the high-energy form.