ATP can be hydrolyzed in two ways: the removal of terminal phosphate to form adenosine diphosphate (ADP) and inorganic phosphate, or the removal of a terminal diphosphate to yield adenosine monophosphate (AMP) and pyrophosphate.
Driving with failing or broken struts is dangerous because they do not sufficiently dampen side-to-side and front-to-back weight transfers.
Both shocks and struts help smooth out your vehicles ride, but only struts are integral parts of the suspension without which you could not drive the car at all. Struts usually have the spring attached to them. Shocks may be attached to the spring (in what's known as a coilover shock) or separate from the spring.