[Photosynthesis] Photsynthesis

fasc.ed from gmail.com via photosyn%40net.bio.net (by fasc.ed from gmail.com)
Sun Jul 27 15:56:28 EST 2008

In cyclic photosynthesis, purple bacteria use cytochromes to pump
hydrogen ions out of the cell. Where do the hydrogen ions come from? I
don't think it's hydrogen sulfide, because I thought hydrogen sulfide
was only used to replenish chlorophyll's electron when its excited
electron is used to reduce NADP to NADPH.

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