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what is cyclic photophosphorylation?
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daytrippper
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lollypenguin
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- photon of light hits ps I and causes electrons to be excited from ps I
- e- move across electron transport chain
- fall in energy used to pump protons from stroma to thylakoid lumen
- causes electrochemical gradient to be formed as more H+ in thylakoid lumen than stroma
- they diffuse down back into stroma via channel protein associated with ATP synthase
- when they pass through ATP + Pi synthesised to produce ATP
- electrons return back to ps I
- key point is no red NADP is made as it returns to the photosystem
- e- move across electron transport chain
- fall in energy used to pump protons from stroma to thylakoid lumen
- causes electrochemical gradient to be formed as more H+ in thylakoid lumen than stroma
- they diffuse down back into stroma via channel protein associated with ATP synthase
- when they pass through ATP + Pi synthesised to produce ATP
- electrons return back to ps I
- key point is no red NADP is made as it returns to the photosystem
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idk01
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sounds like that is right out of the CGP revision guide 
(Original post by lollypenguin)
- photon of light hits ps I and causes electrons to be excited from ps I
- e- move across electron transport chain
- fall in energy used to pump protons from stroma to thylakoid lumen
- causes electrochemical gradient to be formed as more H+ in thylakoid lumen than stroma
- they diffuse down back into stroma via channel protein associated with ATP synthase
- when they pass through ATP + Pi synthesised to produce ATP
- electrons return back to ps I
- key point is no red NADP is made as it returns to the photosystem
- photon of light hits ps I and causes electrons to be excited from ps I
- e- move across electron transport chain
- fall in energy used to pump protons from stroma to thylakoid lumen
- causes electrochemical gradient to be formed as more H+ in thylakoid lumen than stroma
- they diffuse down back into stroma via channel protein associated with ATP synthase
- when they pass through ATP + Pi synthesised to produce ATP
- electrons return back to ps I
- key point is no red NADP is made as it returns to the photosystem
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lollypenguin
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justsomeguy17
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Yeah cyclic photophosphorylation occurs when there's not enough NADP to take the electrons that're excited from photosystem 1, so the electrons just hop down the electron transport chain again - allowing more ATP to be produced.
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