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Home Q & A Board Biology-Related Homework Help Biochemistry
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letsgettothis letsgettothis
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11 years ago
as i read in the book, electron is ejected to electron transport chain and eventually "joins a proton to form hydrogen" then it doesnt make sense:S its not cyclic then.. plzzzzz help!
but in the book they said that an electron when it is ejected it joins a proton to form hydrogen in cyclic photophosphorylation.. plz it would rlly help if u would explain this point thnxxx
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11 years ago
In cyclic photophosphorylation, the electrons extracted from the H2S are sent to the photosystem, excited, go through a chain, and then are shuttled back to the photosystm to become excited again.

The whole purpose of cyclic photophosphorylation is to build up a proton gradient.  The electrons are recycled, and are NOT used to reduce a final energy storage molecule..
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