Biochemistry 4th Edition by Reginald Garrett, Charles Grisham

Exercise 5

The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If noncyclic photosynthetic electron transport leads to the translocation of 7 H + /2 e - and cyclic photosynthetic electron transport leads to the translocation of 2 H + / e - , what is the relative photosynthetic efficiency of ATP synthesis (expressed as the number of photons absorbed per ATP synthesized) for noncyclic versus cyclic photophosphorylation (Assume that the CF 1 CF 0 -ATP synthase yields 3 ATP/14 H +.)