What exactly does it mean for a molecule to be in an 'activated form?' How exactly does this correspond to its energy levels? By this I mean how UDP-glucose is an activated form of glucose, ATP is an activated form of orthophosphate, and acetyl CoA is an activated form of acetate. (I pull this sentence from a textbook). All I can gather is that the molecule is better able to elicit a reaction. But this doesn't seem like a satisfactory explanation. Hopefully someone can elaborate on a much deeper level. Thank you very much.