Photosynthesis: Part 5: Light Reactions | HHMI BioInteractive Video
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- Опубликовано: 22 янв 2019
- This animation provides a detailed look at the chemical processes in the light reactions of photosynthesis. It is appropriate for advanced high school biology through college-level students.
The light reactions of photosynthesis transform light energy into chemical energy stored in molecules of ATP and NADPH. Chlorophyll molecules absorb photons of light in two photosystems, which are embedded in the thylakoid membrane of the chloroplast. The photons energize electrons in the chlorophyll molecules, which drives the electrons through a series of oxidation and reduction reactions in photosystem II. Meanwhile, more electrons are released by the splitting of water molecules, which produces oxygen as a byproduct.
The energy from the light-energized electrons generates a proton (hydrogen ion) gradient. As protons flow through ATP synthase, ATP is formed. Photons energize electrons again at photosystem I, eventually forming the NADPH molecule. Both ATP and NADPH provide energy for making sugars in the Calvin cycle.
To view the rest of this series on photosynthesis, go to the full playlist at • Photosynthesis: Part 1...
To view a specific part of the series, use the following links:
Part 1: Overview
• Photosynthesis: Part 1...
Part 2: Chemical Process
• Photosynthesis: Part 2...
Part 3: Leaf Structure
• Photosynthesis: Part 3...
Part 4: Chloroplasts
• Photosynthesis: Part 4...
Part 5: Light Reactions
• Photosynthesis: Part 5...
Part 6: Calvin Cycle
• Photosynthesis: Part 6...
Part 7: Biosynthesis
• Photosynthesis: Part 7...
To view the entire series as a full-length animation, use the following link: • Photosynthesis | HHMI ...
To download these animations and discover related material, go to www.biointeractive.org/photos... 
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This is so clear. Nice job, Li.
This is really amazing way to make a topper or duffer to understand..... Everyone can understand this particular topic by seeing this video....
I wish I had animations like this when I was studying :D And I'm grateful that I can now use it to train future biologists :)
Glad we could help!
I just got shocked 😳 how you manage to condense this big reaction in very short and precise manner. Thank you so much ☺️
Great Hard Work 👍🏻😀
Glad you enjoyed it!
Biology class would be so much fun if all the concepts are elaborated with such simplicity!
That was sooo AMAZING this topic took my teacher 3 days to complete and you finished it in 3:23 mins. BTW I HAVE MY EXAM NOW 😬 THANK YOU FOR THE HELP
That's great!
Nice video, well realised and explained
This content is awesome!!
this is awesome!!!!
Amazing explanation 👌👌👌
Thank you by..❤️❤️
Glad you liked it
EXCELLENT!!!
Incredibly helpful, thanks!
Glad it was helpful!
Very simple and great!
Such a helpful lecture animated video❤
Thank you very much mam...now it's crystal clear for me 😄!! Good explanation 👍🏻
Glad to hear that
this is so good oh my god thank you
This helped so much thank you !!!
Glad it helped!
wonderful video!! very clear and easily understandable
Glad it was helpful!
thank you so much
noice 非常好
why can't they teach us like this in schools!! like get to the point!!
Thank you
You're welcome
0:57 how does the water get the energy required to split? And even after they do split, doesn't h2o really 'want' to form - as opposed to just H+ and O2 sitting next to one another inside the lumen? If so, what prevents the O2 and H+ from just coming together again? It's like the lumen is a bag of magnets that are somehow not sticking together and the detail of how is just missing from the video.
How many atps and nadph are produced in light rxn?
But why other literature said it's 2 electron? 😢