Photosynthesis: Light Reactions and the Calvin Cycle

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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[@blissfulfragrance2511]

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.

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100% agree. This was excellent.

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@@jordy6636 Hi! May I ask how is this better than the video made by Bozeman Science? Thank you.

[@deedee6460]

Your lectures are a life saver!! Keep ‘em coming!! Thank you!

[@danielgladish2502]

This is an excellent video. Doesn't dumb down any of the concepts while still being clear and concise

[@annelise610]

No matter how many videos I watch I still don’t get it

[@abubakrialliy3350]

Sincerely open your mind to it.

[@MARK-MAN]

Relax.....😌watch it when u feel free

[@nanna1202]

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!

[@Bigmedia777-d3l]

😂😂😂😅

[@colinfranks4635]

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.

[@heathernabors2190]

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!

[@pinkjohn3884]

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.

[@ProfessorDaveExplains]

right on the money! learning the history of science and knowing how we came to understand everything that we do is extremely important.

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Wow! That's totally a mind boggling way to get inspired! Thanks man.

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[@keneanz7194]

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

[@KaitokiNohara]

I wish ..but it's gonna take extra time

[@nickknight5373]

Best summary of the topic I've seen so far on YT.

[@user-bg3jj1dz1v]

u r good at it pr. Dave. still helping after 7 years

[@theaviator1152]

Thanks Professor Dave! Even after two years of high school biology I never knew how plants actually produce oxygen, now I know!!

[@sunitagavande-vi1ol]

MOM, I learnt PHOTOSYNTHESIS from Jesus himself !!!

[@sahildharwani3784]

sir you are last minute saver today was my chemistry test and I revised it totally on your videos btw I love the jingle 😇😇

[@SriramPatnaik-bv7ob]

You probably are already in medschool/have a job; but how is photosynthesis taught in chem?

[@Drforeverok]

@@SriramPatnaik-bv7ob just through more chemical processes and focusing more on the biochem side of things like structures etc

[@tymanning8]

These explanations on Cellular respiration and photosynthesis have been lifesavers! Thank you so much

[@shejoubson9428]

bro THANKS for making it simple

[@solar.10]

Thank you so much for teaching us free

[@kevinmoore2501]

You’ve always put out great vids, Dave. Keep it up! Liked the vid.

[@5minutebiology]

Very comprehensive yet compact and well summarized. The content is precise and amazing. Thanks !

[@Phuktup3]

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!

[@Mu3_1]

I have an exam on Wednesday in this chapter. Could you plz tell me how can I get past exams papers

[@Phuktup3]

@@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.

[@Mu3_1]

@@Phuktup3 it will cover " the photosynthesis" And I'm just looking for notes or last final exams .

[@Mugen_YG]

"Photosystem 2 and Photosystem 1 are backwards because that was the way they were discovered" Some scientists just like to watch the world burn...

[@chrissj2513]

kakyion u still learning science eh

[@x_x5009]

At least it isn't PS 3 -> PS1 -> PS4 -> PS2

[@ta1al]

ah yes, the cause of global warming

[@NewWesternFront]

@@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.

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You sir just made studding way easier.

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U listen to pr Dave during sex?

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I can only read this in a country accent

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@@patrickthestan who doesn't

[@justincristea]

Dave has never failed to make the topic more confusing than before 😂

[@Andrein.3237]

It’s the opposite for me???

[@errebusaether]

Well, it’ll be easy if you first understand how energy or compound structure works. You gotta learn the fundamentals first before you start learning this one. Also, the key terms and definitions.

[@andrependeris]

With more knowledge comes more questions😂

[@errebusaether]

@@andrependeris Fr. 💀 The more I learn, the more questions that keeps popping up.

[@squadmaster114]

Just say you’re stupid bro

[@ume7739]

My teacher's notes make so much more sense now. Thanks really

[@Mu3_1]

How can I get these notes?

[@tabia101]

Lol thanks, my teacher is terrible at teaching...team Dave! 💯💕

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my teacher is terrible at teaching too💕💯

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Good luck on your tests.

[@penguinthegreatest1305]

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[@m101397]

Nice clip, thank you for sharing! After watching this clip, i realized Calvin Cycle, which helps me to understand photosynthesis.

[@abdullahashraf3163]

Professor Dave explains so clearly🤩Big Hands sir👍

[@JMYaden]

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!

[@adarshjha1999]

How can an enzyme(RUBISCO) can be utilized in a chemical reaction(PHOTOSYNTHESIS) ??

[@ProfessorDaveExplains]

every enzyme has a different mechanism of action! but they are all catalysts. check out my clip on enzymes.

[@Vanessa._7]

excellent explanation! thank you

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Thank you sir. ..I clear my many of concepts by this video

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Thank you I now understand the lesson Im cramming for an exam

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Professor Dave is a good all rounder

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Always the relentless genius ... thanks profe...

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This was so good but I’m going to have to watch it at least twice more for it to soak in.

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Wow..! I have already subscribed for more... nice content Prof. DAVE

[@lexie.ward.]

Omg your jingle sounds like my favorite band, They Might Be Giants.

[@nonhlanhlaprincessdlamini3385]

And I did it again,this time it was photosynthesis!!! Thanks a lot Prof

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Reviewing for NMAT for the October 21 exam, not a pre-med course, I'm doomed 😭

[@saragalea9134]

I watched so many of Professors Dave videos but the intro still makes me giggle 😅

[@SadhuBiochemist]

Good job! Clear and concise:)

[@nelsonphysics]

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).

[@williamraleigh7546]

Why do you say 20 pi?

[@marchurtubise4722]

Prof. Dave is a real one

[@johntindell9591]

Thank you

[@johndemwell6022]

4:44 - 5:38 you helped me create a 3D model of Calvin Cycle. Thank you.

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lets see it

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That's fabulous, thanks professor

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I pray you get the things you pray for, you helped a ton.

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Dominates Mr Anderson on this topic

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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.

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Very educational video

[@NC-mv1rw]

Great video! I am having a little trouble seeing where the 9 ATP and the 6 NAPDH are coming from

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this the goat right here

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Allow me to offer me my thanks to you sir professor Dave.You exaplained these complicated steps and made them easy for me!!!😀👍

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Appreciate you, prof

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thank you professor Dave👍

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Thanks, it solves my headache.

[@muhammadhasan1253]

electrons hop between chlorophylls by resonance transfer, they don't emit their own photons.

[@6206ada]

Just about to comment this!! I really wanna know how resonance transfer works

[@muhammadhasan1253]

@@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.

[@6206ada]

@@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 😅💚

[@muhammadhasan1253]

@@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.

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Thank you teacher! Keep it up!!!

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this hella good so clear

[@bellaazizi4230]

thankss now i understand clearly abt this

[@user-pv7po3fg4j]

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?

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Thank you rold.

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thank you

[@maryfrancestheresec.estrel1360]

this so helpful to understand. thank you. Grade 9 student.

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Love from India ❣️ Thanks sir 🥰

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You are the best!

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Awesome

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Awesome!

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ILY

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This is the only video that makes sense thank you!😂

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Who else watches this for their Science Activity?

[@imtheski5908]

well the synthesis is intersecting the mithrochondriasynthesis of the photosynthesis thats bisecting the binary code of the honoricificialicalibility

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♥stay blessed professsor!!!

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This man is the Cr1tikal of biology

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I finally understand why people need to use body language to not appear uninterested while they're talking.

[@keziah.johnson]

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!

[@sonice9020]

im smiling thank u sir

[@bbbros8826]

My school biology teacher send this video link and told us to watch it and explain to her. 👀👀👀

[@waleedtariq6234]

This guy even not mentioned the enzyme working in this process and also does not mention the side redox reactions,i think it only for students who have already a tight grasp on this topic.also not mentioned how G3P converts back to Ribulose 5 phosphate.

[@EpicSelenium34]

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?

[@ProfessorDaveExplains]

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.

[@maximilianojosefanegovalen1622]

So which ones are the light independent reactions and which ones are the light dependent reactions ?

[@lawrence2823]

thank you professor Jesus, for designing photosynthesis so we humans can be alive

[@ZarakiJoy]

This is crazy!

[@kevinmoore2501]

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?

[@ProfessorDaveExplains]

all of the features and functions of the cell are necessary to survival, to my knowledge!

[@kevinmoore2501]

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.

[@ProfessorDaveExplains]

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!

[@kevinmoore2501]

Thanks, Prof. Dave.

[@kevinmoore2501]

@@ProfessorDaveExplains One more question, how does EM radiation, and nuclear radiation differ from each other?

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Professor dave we want you to make vadio on how you memoize a lot of things Quick ..

[@kincypreslaquindanum5479]

what is the substages of light dependent and independent reaction?

[@yinesther5929]

Photosynthesis Clyde

[@suyashmhatre2916]

Thanks a lot you sajed me.😢

[@tsitsilashvilimari8020]

Do you know photosynthesis voiced by Morgan Freemer?

[@hafizumar4083]

Plants produce ATP and NADPH in light reactions. Can plants produce ATP and NADPH without the dark reactions ??

[@diceandcards8272]

I think yes, but they are required for the Calvin Cycle, so there would be no point of their existence.

[@hafizumar4083]

@@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 ..

[@bollywoodonly1955]

@@hafizumar4083 Bro, are u Hafiz ?

[@appl3thegr3at64]

​@@hafizumar4083the dark reactions indirectly depend on light but it depends on the products that light dependent reactions made to produce glucose

[@sargunsingh8585]

Very helpful!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@EpicSelenium34]

This is like cellular respiration backwards.

[@diceandcards8272]

Wait till you see the Krebs Cycle.

[@Malik-em6ng]

wait didn´t you skip fase 3 in the last part ?