photosynthesis q Watch

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the_wizzz
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#1
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#1
why does cyclic photosynthesis sometimes happen without non-cyclic?
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Seth
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#2
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(Original post by the_wizzz)
why does cyclic photosynthesis sometimes happen without non-cyclic?
Cyclic phosphorylation takes place when the electron is displaced from photo-system 1- there's no real reason behind it's just a different route the electrons can take
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Mehh
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Except the cyclic pathway accepts lower energy photons?
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Ramaya
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#4
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I thought cyclic photophosphorylation occurred when there are plenty of reduced NADP (NADPH) molecules available for use in the light independent stage. I really cannot remember where I read that so I may be wrong.
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Seth
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#5
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(Original post by Mehh)
Except the cyclic pathway accepts lower energy photons?


(Original post by Ramaya)
I thought cyclic photophosphorylation occurred when there are plenty of reduced NADP (NADPH) molecules available for use in the light independent stage. I really cannot remember where I read that so I may be wrong.

Both seem correct statement...Photo system 1 contains higher energy electrons so to speak therefore lower energy photons are required to displace them? (I'm not a physicist so this may not be strictly correct :rolleyes: )...Also, seeing as cyclic phosphorylation will not increase amounts of reduced NADP then it is favoured when there is an excess of reduced NADP
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Cirsium
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And there was me thinking that the whole point is that cyclic phosphorylation directly produces ATP.
If the plant needs energy NOW then there is no point in entering the Calvin cycle and mking glucose, just so it can be converted back into ATP
During cyclic phosphorylation the same electrons are cycled, producing more and more ATP but nothing else
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eggnog
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#7
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The hexose phosphate produced by the Calvin cycle is used to synthesise other things than glucose, though.
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hjmorgstew
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#8
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Also non cyclic can't happen if there is a lack of water.
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