Photosynthesis: Light Reactions and the Calvin Cycle
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- Опубліковано 7 сер 2024
- We get energy by eating other organisms, but plants don't have to do that. They can build their own food out of water, carbon dioxide, and sunlight. I'm sure you've heard of photosynthesis before, but let's take a look at some of the finer points, shall we?
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No matter how many videos I watch I still don’t get it
Sincerely open your mind to it.
Relax.....😌watch it when u feel free
Have you tried writing and drawing all the different steps? I'm taking biochem for my bachelors in biology and I'm often overwhelmed but drawing it out makes all the difference - hang in there!
😂😂😂😅
I’ve been studying it religiously the last few days and I think I finally have a good idea on it. I watched many different videos and looked through a couple books.
Man this deserves more views. Honestly this is the best video on photosynthesis I've found and I've been searching for 2 hours. This is even better than bozemanscience and khan academy
THANK YOU I LOVE YOU
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Legit! He is the only one that can get information through when the rest fail to.
ice cream yeah the bisector
100% agree. This was excellent.
@@jordy6636 Hi! May I ask how is this better than the video made by Bozeman Science? Thank you.
Your lectures are a life saver!! Keep ‘em coming!! Thank you!
Been studying for about six hours now reviewing videos that my professor has provided and was lost...this just cleared it up in about six minutes. Thanks!
u r good at it pr. Dave. still helping after 7 years
This is an excellent video. Doesn't dumb down any of the concepts while still being clear and concise
You’ve always put out great vids, Dave. Keep it up! Liked the vid.
Best summary of the topic I've seen so far on YT.
how smart is this process, make me think of the guys who sorted all this out. If we guys have a bit of difficulty in understanding all of this I think we should spend a little time giving prase to all the people who discovered all of this,by checking out the history of these discoveriers.
right on the money! learning the history of science and knowing how we came to understand everything that we do is extremely important.
Wow! That's totally a mind boggling way to get inspired! Thanks man.
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What about the one who made all of this? God deserves to be thanked praised and worshipped for the creation of all this complex beings by just a word
I wish ..but it's gonna take extra time
These explanations on Cellular respiration and photosynthesis have been lifesavers! Thank you so much
Nice clip, thank you for sharing! After watching this clip, i realized Calvin Cycle, which helps me to understand photosynthesis.
Thanks Professor Dave! Even after two years of high school biology I never knew how plants actually produce oxygen, now I know!!
Very comprehensive yet compact and well summarized. The content is precise and amazing. Thanks !
bro THANKS for making it simple
sir you are last minute saver today was my chemistry test and I revised it totally on your videos btw I love the jingle 😇😇
You probably are already in medschool/have a job; but how is photosynthesis taught in chem?
@@SriramPatnaik-bv7ob just through more chemical processes and focusing more on the biochem side of things like structures etc
Thank you sir. ..I clear my many of concepts by this video
Thank you so much for teaching us free
Wow..! I have already subscribed for more... nice content Prof. DAVE
excellent explanation! thank you
The process isn’t as confusing as it was before (I have watched so many videos) I think I just wasn’t ready. Getting a clearer picture it’s is more amazing than anything else. How incredible it is this process not only exists, but is the reason we all draw breath. The electron getting moved around like that….. Great video!
I have an exam on Wednesday in this chapter.
Could you plz tell me how can I get past exams papers
@@Mu3_1 I am unsure of what the exam will cover, I’m sorry, I cannot help. I understand the process generally and I would need to do my own further studying to help anyone else.
@@Phuktup3 it will cover " the photosynthesis"
And I'm just looking for notes or last final exams .
You're amazingggg, I wish you were my teacher.
I LOVE YOU SO MUCH
And I did it again,this time it was photosynthesis!!! Thanks a lot Prof
Professor Dave explains so clearly🤩Big Hands sir👍
Good job! Clear and concise:)
"Photosystem 2 and Photosystem 1 are backwards because that was the way they were discovered"
Some scientists just like to watch the world burn...
kakyion u still learning science eh
At least it isn't
PS 3 -> PS1 -> PS4 -> PS2
ah yes, the cause of global warming
@@x_x5009 then you just remember it as the "fucked up" process. kinda like remembering purines are bigger than pyrimidines because they are the smaller word. lol.
That's fabulous, thanks professor
My teacher's notes make so much more sense now. Thanks really
How can I get these notes?
Always the relentless genius ... thanks profe...
Prof. Dave is a real one
thank you professor Dave👍
Allow me to offer me my thanks to you sir professor Dave.You exaplained these complicated steps and made them easy for me!!!😀👍
Professor Dave is a good all rounder
Thank you teacher!
Keep it up!!!
You sir just made studding way easier.
U listen to pr Dave during sex?
I can only read this in a country accent
👀💀👀
@@patrickthestan who doesn't
Great video! I am having a little trouble seeing where the 9 ATP and the 6 NAPDH are coming from
This was so good but I’m going to have to watch it at least twice more for it to soak in.
Thank you I now understand the lesson Im cramming for an exam
Good luck on your tests.
this hella good so clear
Very educational video
thank you professor dave you are the best ❤❤
MOM, I learnt PHOTOSYNTHESIS from Jesus himself !!!
Awesome!
thankss now i understand clearly abt this
Appreciate you, prof
I watched so many of Professors Dave videos but the intro still makes me giggle 😅
Omg your jingle sounds like my favorite band, They Might Be Giants.
Thank you
How can an enzyme(RUBISCO) can be utilized in a chemical reaction(PHOTOSYNTHESIS) ??
every enzyme has a different mechanism of action! but they are all catalysts. check out my clip on enzymes.
The light reaction that was explained is the Non-Cyclic Photophosphorylation right?
Coz the Cyclic Photophosphorylation is diff...pls let me know asap...
You are the best!
This is the only video that makes sense thank you!😂
Sir hum phosynthsis ko define karty huy kahty hain k it produce glucose but at the end of calvin cycle G3 P formed then where and how Glucose formed..
So which ones are the light independent reactions and which ones are the light dependent reactions ?
Professor, in your video you say that 1 electron is excited by the photon. However, 2 electrons from water are used to replenish chlorophyll, and it takes 2 electrons to reduce NADP+ to NADPH, so where does the other electron come from?
just one electron per reduction! notice the charge changes by one only. i think it's just the coefficients of the balanced equation that can get confusing.
♥stay blessed professsor!!!
Ur animations very nice sir
thank you
4:44 - 5:38 you helped me create a 3D model of Calvin Cycle. Thank you.
lets see it
Thank you rold.
what is the substages of light dependent and independent reaction?
Extraordinary that plants harness the most abundant power source in the universe: starlight. It would seem that we could learn much from their internal machinery. Thank you for sharing your knowledge, Professor Dave, and creating these easy-to-use graphics!
Thanks, it solves my headache.
thanks sir it helps for my NEET exam
Thank you for this concise video! I'm only a week into my biochem 2 class and was already getting lost! This was super helpful to sum up the light and dark rxns!
Reviewing for NMAT for the October 21 exam, not a pre-med course, I'm doomed 😭
question. If one CO2 gives off two 3PGA, and each 3PGA makes one G3P, and out of every 6 G3P only one goes towards glucose production, that means 3 CO2s only produced 1 net G3P, right? So my question is, wouldnt that mean we need 18 CO2 to produce one glucose? Why do all textbooks say we only need 6?
I pray you get the things you pray for, you helped a ton.
i love dave
I watched your video just yesterday and i passed my test today🥰
this so helpful to understand. thank you. Grade 9 student.
Great video! One minor correction: at 2:00 you refer to the ring structure of chlorophyll as porphyrin. It is in fact a chlorin ring, since it only has 20 π electrons and is therefore not fully aromatic like porphyrin (with 22 π electrons).
Why do you say 20 pi?
I love these videos. Liked, and subscribed. Relating to photosynthesis, and chloroplasts, are cell walls, or anything specific to a plant cell required for the survival of chloroplasts?
all of the features and functions of the cell are necessary to survival, to my knowledge!
Alright. I was just thinking that, the chloroplast couldn’t survive if exposed to certain bands of radiation that were filtered out by the cell wall, or if the cytosol absorbed some harmful radiation that would otherwise harm the chloroplast.
oh i see what you mean, hmm well obviously high-energy radiation like gamma can be destructive to almost anything but i don't know anything about whether certain frequencies are absorbed by other cellular components. interesting concept!
Thanks, Prof. Dave.
@@ProfessorDaveExplains One more question, how does EM radiation, and nuclear radiation differ from each other?
this the goat right here
Lol thanks, my teacher is terrible at teaching...team Dave! 💯💕
my teacher is terrible at teaching too💕💯
This man makes my real professors look like they don't know what they are doing. Yes, the animation (green screen) aids in his work, but like damn... A well created powerpoint slide would be a solid substitute.
Dominates Mr Anderson on this topic
Awesome
Professor dave we want you to make vadio on how you memoize a lot of things Quick ..
Love from India ❣️ Thanks sir 🥰
Why there is ps I produce nadph and not atp
wait didn´t you skip fase 3 in the last part ?
best content on youtube! thanks for helpin us all
Good presentation
nice ,,content
This is crazy!
Sir as ATPs are used in Calvin cycle ,can we call Calvin cycle as amphibolic pathway??
Can you explain ambhibolic term
@@hirafatima3453 catabolic+anabolic
U are d best
what happens after plants produce GLUCOSE? will it converted into ATP's as happens in cellular respiration in animals?
yes they break it down pretty much like we do!
im smiling thank u sir
ILY
Proffesor plzz upload a video on the chapter refraction of light plzz
Gurpreet Simngh Nigam
Thanks a lot you sajed me.😢
well the synthesis is intersecting the mithrochondriasynthesis of the photosynthesis thats bisecting the binary code of the honoricificialicalibility
HOW ARE THE LIGHT REACTIONS CONNECTED TO CALVIN CYCLE? DID I MISS IT?
Very helpful!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
electrons hop between chlorophylls by resonance transfer, they don't emit their own photons.
Just about to comment this!! I really wanna know how resonance transfer works
@@6206ada simply put, excited electrons transfer energy to electrons on nearby chlorophylls making them move to an excited state and then the process continues. Resonance energy transfer works due to close proximity provided by multiple proteins making up Photosystems.
@@muhammadhasan1253 true! I am a 3rd year biology major and I keep asking my prof questions and the answer is always “that’s a graduate level question, but here’s the simple version” gimme the complex version lol I wanna know EXACTLY HOW 😅💚
@@6206ada for that u would hav to do sm reading. Any Biochem textbook chapter on photosynthesis explains this in detail, read end of chapter cited articles for in depth understanding.
Plants produce ATP and NADPH in light reactions. Can plants produce ATP and NADPH without the dark reactions ??
I think yes, but they are required for the Calvin Cycle, so there would be no point of their existence.
@@diceandcards8272
Actually I am confused because dark reactions depend on light because the output of light reactions ATP and NADPH are utlized in dark reactions. So, my question is does light reaction also depends on dark ?? Or plant is able to produce ATP and NADPH in absence of dark reactions ..
@@hafizumar4083 Bro, are u Hafiz ?
@@hafizumar4083the dark reactions indirectly depend on light but it depends on the products that light dependent reactions made to produce glucose
Professor Dave, at 2:14, from what part of chlorophyll does the excited electron come? Is it from the Mg2+ ion in the center, or from another part of the molecule?
hmm, if i remember correctly, it's the entire heme group, all those delocalized electrons around the cyclic portion, maybe that's why it works because then the positive charge is delocalized all around that group.
Ah yes, that makes sense. In his video on the Light Reaction in Photosynthesis, Sal from Khan Academy says that the electron comes from the double bonds in the the porphyrin ring. If you look at the Wikipedia page for chlorophyll-a, you will see a structure with a TON of resonance in place of the double bonds Sal's talking about, so it is just as you said. Thank you!
My school biology teacher send this video link and told us to watch it and explain to her. 👀👀👀
If the rate of photosynthesis is optimum then what are the limiting factors.
??
Light
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