A2 Biology - Z-scheme: The light-dependent stage (OCR A Chapter 17.3)
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- Опубликовано: 6 июл 2024
- The first stage of photosynthesis happens in the thylakoid membrane where photosystems exist. It requires light - without it, the reaction chain cannot start. Light is absorbed by the photosystem II to do photolysis which breaks down water to release protons, electrons and oxygen. The electrons then get excited by the light energy and go into electron transport chains, producing ATP. They repeat the excitation process as they arrive at photosystem I. They then meet up with the protons at the NADP reductase to reduce NADP, which then goes on into the next stage of photosynthesis (Calvin cycle). Protons go through ATP synthase in the electron transport chains to produce ATP at various places on the thylakoid membrane.
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haha glad they help, thanks for watching! :D More coming soon (uploading one now)
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Glad to be of help :) Thanks for watching!
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I'm glad to hear that you found the video helpful! The visual demonstration is the aim here ;) thanks for watching!
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Hiya, I'm just a little confused so after the Electron transport carrier from Photosystem II is there another ATP synthase like the one at the end (after the ECT from PSI) which is what produced the ATP?
Yes! There are multiple ATP synthases along the membrane, so there would be some found after each ETC.
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Glad you found it helpful! Thanks for watching :D
This is such a useful video thank you so much!! I do have one question, for the electron carrier and the EC in the diagram are they the same thing or is the EC the electron transport chain?
EC is just my shorthand for electron carriers! All of them together forms the electron transport chain. Hope this clears it up and thanks for watching! :)
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Haha glad you found the videos helpful! Thanks for watching :D
At 2:12, you wrote NADP donates a proton to gp and hence the gp is reduced. Are you referring to the reduction as in donating electrons? Because isn't reduction the gaining of electrons, not protons.
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By reduction I meant the reduction of GP to TP. Reduction is the gaining of hydrogen and/or electrons! :) Hope this clears things up and thanks for watching!
@@BioRach Ah makes sense. Reduction can be both donating of Hydrogens and electrons. Thank you.
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Glad you find it helpful! Thanks for watching :)
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Amazing video as always, I was just wondering is there a reason when would the plant choose use cyclic photophosphorolation or non cyclic phsophophorolation, thanks
The plant may opt for cyclic photophosphorylation if it's lacking in ATP! Keep in mind that the light-independent stage requires ATP for the conversion of substrates, so it can't do that if there isn't enough ATP.
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I was wondering how come only 1/2 an oxygen atom is released from the water molecule? Thanks, your videos are super helpful :)
It's 1/2 an oxygen molecule, so really just an oxygen atom, since there's only one per water molecule! Hope this clears it up and thanks for watching :D
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