How is ATP produced in mammalian cells under aerobic conditions? 1. photophosphorylation 2. oxidative phosphorylation 3. substrate-level phosphorylation 4. phosphorolysis a. 1 b. 2,3 and 4 c. 2 d. 1 and 2 e. 2 and 3 Solution Hi, 4.Phosphorolysis: in this process cleavage of a compound where attacking group is phosphate. Hence by analysing above explanation it is obvious that only option c. 2 (oxidative phosporylation) is correct. I hope my answer is satisfactory. Thanks!!.