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light dependent reaction on photosynthesis

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light dependent reaction on photosynthesis

Postby biochemical » Mon Sep 25, 2006 4:15 pm

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... :P
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Postby biochemical » Tue Sep 26, 2006 11:52 am

Thank U so much, Keith. It's really helpful... :)
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Postby kabuto » Sun Oct 01, 2006 5:58 pm

keef wrote: Non Cyclic Photophosphorylation

This process is a little more complicated that the cyclic process. There are many important processes occurring at the same time. It will be necessary to run the animation several times and focus in on one step at a time. Only then will it be possible to see them as a single process.



where is the animation??
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Postby kiekyon » Sun Oct 01, 2006 6:07 pm

noncyclic phosphorylation produce ATP and NADPH
cyclic phosphorylation produce ATP but no NADPH

so, if NADPH level is high, we revert to cyclic phosphorylation
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Postby MrMistery » Sun Oct 01, 2006 6:15 pm

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..
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Postby kiekyon » Mon Oct 02, 2006 3:26 am

MrMistery wrote: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..


i dont know u can still call something as 'phosphorylation' without producing ATP???
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Postby MrMistery » Mon Oct 02, 2006 5:46 pm

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"
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Postby éireann ní chiarráin » Wed Oct 25, 2006 2:04 pm

Question: How to you actually go about making the ATP from ADP during cyclic and noncyclic photophosphorylation? Please respond!

Many thanks,
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