into useable energy occurs through cellular respiration
Chemiosmosis in cellular respiration ..
The entire process of cellular respiration can be broken down into three separate stages: Gycolysis (meaning splitting sugars), the Citric Acid Cycle, and the Electron Transport Chain.
across a membrane during cellular respiration or photosynthesis
Plants do resort to cellular respiration, wherein the products of photosynthesis are reunited to produce energy, which they have to do in order to convert the energy which is stored in the form of glucose into usable chemical energy.
Chemiosmosis in Photosynthesis& Respiration - Video ..
And to reward you for reading through all that, here's a cute little song I found on youtube about the relationship between cellular respiration and photosynthesis.