This is a question for which I've found it surprisingly hard to find a good answer. Biology texts talk mystically about the ATP->ADP reaction providing energy to power other reactions. I'd like to know some more details. Is this following roughly right ?
- Each reaction in a cell has a specific enzyme.
- Each enzyme has binding sites for, say, two molecular species AND for an ATP molecule.
- When a reaction takes places, the two species bind to the enzyme, and a little later, an ATP molecule binds.
- For some reason (why ?), the ATP->ADP reaction is now energetically favourable, so the high-energy bond breaks.
- This releases electromagnetic energy at some characteristic frequency.
- Certain bonds in the enzyme have a resonant frequency that allow them to absorb this electromagnetic energy (the EM energy disturbs molecular dipoles ?).
- The 3D structure of the enzyme is disturbed (i.e. it bends) in such a way that the 2 molecular species are mechanically forced together, providing sufficient activation energy for the reaction in question.
- The newly formed species no longer binds nicely to the enzyme (why ?) so it detaches, as does the ADP, which also doesn't bind as nicely as ATP.
- The End.
So, is that an accurate summary ? Anyone care to add some more physical details ? (like all the thermodynamics and quantum chemistry I have no idea about)