Photosynthesis: Light Reactions and Photophosphorylation

More detail on the light reactions and photophorylation

[danbedans]

I hope those who watched about 7, 8, 9 and 10 years ago passed well and are
doing well in their lives.

[litashix]

Wow. Thank you so much Sal. Photosynthesis is easy in general bio but in AP we get all specific and i swear i was lost. Ive been watching all your videos on photosynthesis and i feel much better on my understanding on photosynthesis. Im actually interested in learning about it and im fascinated. Your videos are SO MUCH BETTER than books/teachers. Thank you so much.

[FireSakura]

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[helenedemol]

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it's so cool to see someone who is so passionate and excited about what he's explaining

[sabrinadelisfort]

Those who have disliked are professors who are jelly.

[Trevman]

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[Ehle]

my exam is tomorrow and ive been watching your videos and theyve helped me understand cellular respiration and photosynthesis a ton more

[MsterFancyPants]

I'm watching this while in my mother's womb right now. Got 120% on the last exam.

[halobed]

God bless u khanaacademy
greets from a medical student from Kosovo

[JulzMarie]

khan are the most amazing have such a good way of explaining things where lecturers talk all complex and it gets really confusing....i really admire what you do and i think i speak for everybody when i say THANK YOU SO MUCH KHAN ACADEMY

[amariafields]

Please never stop teaching these videos help so much

[yaldag]

Correction: 16:54 - 17:11
The cyclic electron flow uses PSI but not PSII... The e- cyclic back from Fd to cytochrome complex from there to P700 in the PSI.

[aniyeats]

Correct me if I'm wrong but I don't think there is involvement of Photosystem 2 in cyclic photophosphorylation. Electrons flow from plastoquinone to cyt b/f to plastocyanin, then reduce ferredoxin through light driven PS1.

[Yurizen]

i've been growing dependent on your videos sal, thanks alot!

[Dynorphin]

I have a biochem 2 exam in 10 hours. This is helping a lot.

[sym]

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[ull]

Thank you so much Sir, with out your video i would have never understood this. it was so confusing, but now i have a very good understanding. Thanks for getting into the "weeds" because it only helped me more in understanding the process..

[undagrundvibes]

@grayshorts You're right. In cyclic photo phosphorylation, the electron skips PS2 and gets circulated back to PS1 by re-entering either the cytochrome complex or plastoquinone.

Also, I thought the last electron carrier in non-cyclic is ferradoxin, not plastocyanin. Correct me if I'm wrong.

[JSanctum]

Right after protein Fd (Ferredoxin), there's a NADP+ reductase protein where NADP+ + H+ (proton) helps make NADPH ultimately for use of Calvin Cycle.

Also, for cyclic photophosphorylation or cyclic electron flow, the proteins involved for the electron transport chain is PS I, Ferredoxin, Cytochrome complex, and Plastocyanin, then back to PS I. I don't think the electron transport chain goes as far back as PS II? We're only concerned about Chorophyll a (P700) in PS I when we're on Cyclic electron flow. Yes, ATP is the product of cyclic electron flow and no NADPH. Thank you for the upload! Glad to review this.

[mimuraS]

god bless khan, god bless eng subs, god bless their makers, god bless everybody in general