The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal.
Wikipedia English The Free Encyclopedia. Organophosphate. An organophosphate (sometimes abbreviated OP) or phosphate ester is the general name for esters of phosphoric acid. Many of the most important biochemicals are organophosphates, including DNA and RNA, as well as many of the cofactors essential for life. Organophosphates are the basis of many insecticides, herbicides, and nerve agents.
As you can see in the figure above, ATP contains three phosphate groups. These groups are primarily responsible for ATP's role as an energy source. During metabolic reactions, these phosphate groups can be transferred from ATP to yield either adenosine di phosphate (ADP) or adenosine mono phosphate (AMP).