Current Attempt in Progress

Based on comparison of oxidative phosphorylation to photophosphorylation, which of the following is TRUE?

Photophosphorylation cannot be uncoupled by an ionophore like can be done with oxid$$tive phosphorylation.

The formation of a proton gradient is required for adequate function of both photo$-$ and oxidative phosphorylation.

Although sequence similarities exist between the ATP synthases from each process, little structural similarity is observed.

Photophosphorylation is not dependent on spontaneous electron flow whereas oxidative phosph$$rylation requires that electron flow be spontaneous.

None of the above is true.