During cellular respiration, hydrogen atoms are not directly transferred from glucose to oxyger they are transferred first to a coenzyme (NAD+ or FAD). What is the advantage of slowly oxidizing an organic molecule, compared to a quick, explosive oxidation during combustion (Figures 9.5 and 9.6 ) and above? Occurs by phosphorylation (chemical reactions that form ATP by adding an inorganic phosphat Formation of ATP from ADP to ADP). How do the two methods of phosphorylation differ?.