light dependent reaction on photosynthesis
September 25, 2006 at 4:15 pm #5798biochemicalParticipant
I’m confused about cyclic and non-cyclic photophosporilation. Do they happen at the same time? And what connects them? Thanks a lot for the help… 😛
September 26, 2006 at 11:52 am #55394biochemicalParticipant
Thank U so much, Keith. It’s really helpful… 🙂
October 1, 2006 at 5:58 pm #55766kabutoParticipantquote keef:
where is the animation??
October 1, 2006 at 6:07 pm #55771kiekyonParticipant
noncyclic phosphorylation produce ATP and NADPH
cyclic phosphorylation produce ATP but no NADPH
so, if NADPH level is high, we revert to cyclic phosphorylation
October 1, 2006 at 6:15 pm #55775MrMisteryParticipant
actually if you really want to be more catholic than the pope, there are 3 kinds of cyclic phosphorilation:
1. around photosystem I: produces ATP but no NADPH
2. around photosystem II: does not produce ATP nor NADPH, striclty as a protection mechanism when the electron flow id to great.
3.(what is reffered to as the water-water cycle): around both photosystems, and also strictly as a protection mechanism.
Botany is complicated i’m afraid..
October 2, 2006 at 3:26 am #55819kiekyonParticipantquote MrMistery:
i dont know u can still call something as ‘phosphorylation’ without producing ATP???
October 2, 2006 at 5:46 pm #55870MrMisteryParticipant
good point. my mistake. three kinds of cyclic electron flow. in generalit’s not good to say cyclic and non-cyclic phosphorilation, because the phosphorilation takes place in the same way, only the ways the electrons are transported are different. That’s why we should always say "cyclic and noncyclic electron transport"
October 25, 2006 at 2:04 pm #57320éireann ní chiarráinParticipant
Question: How to you actually go about making the ATP from ADP during cyclic and noncyclic photophosphorylation? Please respond!
November 20, 2018 at 9:25 am #116392kkParticipant
Cyclic photophosphorylation vs. Non-cyclic photophosphorylation
Which organisms use which mechanism? I’ve been looking for the answer but couldn’t find a reliable one, most answers are very vague. If the organism has both PSI and PSII, it can readily switch between cyclic and non-cyclic, depending on the NADPH concentration? One thing looks certain: isolated chloroplasts use cyclic, but under natural circumstances, what’s the case, please?! Thank you so much in advance!
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