It's not quite accurate to say there are individual molecules forming ATP. ATP, or adenosine triphosphate, is a single molecule itself. It's comprised of:

* Adenine: A nitrogenous base

* Ribose: A five-carbon sugar

* Triphosphate group: Three phosphate groups linked together

The key to ATP's function lies in the bonds between the phosphate groups. These bonds are high-energy and can be broken to release energy, converting ATP into ADP (adenosine diphosphate) and a free phosphate group. This energy is then used by cells for various processes.

So, it's not about "forming" ATP from individual molecules, but rather about breaking down the existing ATP molecule to release its stored energy.