What is the difference between "Bisphosphate" and "Diphosphate" in biochemistry?

Question

I have often found bisphosphate compounds ( e.g. RuBP, RuBisCO, 2,3-BPGA etc.) and diphosphate compounds (e.g. ADP, GDP etc.) in biochemistry. They are commonly seen and are important compounds in both animals and plants but what is the basic difference between a bisphosphate and a diphosphate?

Answer 1

Essentially, in a diphosphate compound, the two phosphate moieties are attached (bonded) to each other, as in ADP. In a bisphosphate compound, the two phosphate moieties are not attache to each other, but rather are bonded at different places in the compound.