Cyclic Electron Flow Question

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jetpower18
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Cyclic Electron Flow Question

Post by jetpower18 » Tue Jun 06, 2006 12:03 am

Hello, in cyclic electron flow, how many protons are pumped into the thylakoid for every 2 electrons? Also, what is the ratio of protons to ATP produced ratio?

Thank you.

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MrMistery
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Post by MrMistery » Tue Jun 06, 2006 6:19 pm

The answer to both is: same as the non-cyclic electron flow.
Also, take note that there are more than one cyclic electron flow system:
1.through phostosystem 1 -generates ATP, but not NADPH + H+. This is the most common cyclic electron flow many people relate to.
2. Through photosystem 2 - generates nothing, role only in photoprotection
3. Water-water cycle: through both photosystems, also generates nothing.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

jetpower18
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Post by jetpower18 » Sat Jun 10, 2006 9:15 am

From some sources, 2 protons are pumped for every 2 electrons. So I would like to verify whether it is 4 protons per 2 electrons or 2 protons?

Thank you

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