In its mechanism, photophosphorylation is most similar to ________.
A) substrate-level phosphorylation in glycolysis
B) oxidative phosphorylation in cellular respiration
C) the Calvin cycle
D) carbon fixation
E) reduction of NADP+

Question

Quizplus · Accepted Answer

Photophosphorylation and oxidative phosphorylation both involve the generation of ATP through a proton gradient. In photophosphorylation, light energy is used to pump protons across a membrane, generating a gradient that powers the production of ATP. In oxidative phosphorylation, the protons are pumped across the inner mitochondrial membrane by the electron transport chain, generating a gradient that powers the production of ATP. Substrate-level phosphorylation in glycolysis involves the transfer of a phosphate group from a substrate to ADP to generate ATP, which is a different mechanism than photophosphorylation. The Calvin cycle and carbon fixation are not mechanisms for the generation of ATP. Reduction of NADP+ is important in photosynthesis, but it is not directly related to photophosphorylation.

In Its Mechanism, Photophosphorylation Is Most Similar to ________