i feel like you have a video for every single topic out there. you are amazing and a true blessing. thank you for all your time and help. i thought i was doomed for homeostasis but you saved me!
I'm taking biology right now just for fun and I must say there are more to learn than just engineering. I'm thrilled and fascinated by science. I really enjoy your videos. It's a lot easier to understand through videos than a textbook. Thanks again for the your videos.
@calemontree Thank you for this! I was actually typing out the question "So when is photorespiration favoured over the normal cycle?" but lucky it had already been answered. Also, a huge thanks to you, Sal. Honestly, I don't know how I would even contemplate passing my A Levels without your videos. You understand that the generation growing up is the digital generation. The age of the best learning technique being a classroom is over. Thank goodness we have people like you, Sal.Thank you.
@Largesoftprunes At high temperatures, plants usually close their stomata in order to conserve H2O, because if their stomata were open, their water would evaporate very quickly on hot days. When the plants stomata are closed, no gas exchange occurs which means that no CO2 is replenished and no oxygen exit the plant. As photosynthesis occurs, [CO2] decreases and [O2] increases to a point where there is a lot more O2 than CO2. Because of this, RuBisCO is more likely to fix O2 than CO2.
Awesome video, very well put together, spoke very clearly, easy to understand, great use of colours and you made it fun to learn. You should be Proud :-)
484peanut: This video is correct. Photorespiration is a process that takes place in the chloroplasts, as it is another thing that can happen in the Calvin cycle. The Calvin cycle does NOT take place in mitochondria, therefore photorespiration would NOT take place there. Perhaps you're thinking of cellular respiration? That takes place in the mitochondria. However, it is COMPLETELY different from photorespiration and if you're getting the two confused, you might want to fix that.
Is there a reason you use "Bi" instead of "Bis" when referring to RuBisCo? Is it because you're leaving out the "1,5" in "Ribulose 1,5 Bis-phosphate carboxylase oxygenase"? Great videos!
When the oxygen reacts with RuBP, the phosphoglycolate produced becomes glycine, an amino acid, combines with another glycine, gives off CO2, and creates phosphoglycerate again. Therefore, 4O2+4RuBP=4phosphoglycerates+4phosphoglycolates. The 4 phpsphoglycolates become 2 phosphoglycerates and 2 molecules of CO2. So the 6 phosphoglycerates become 6 PGALs and one leaves and the other 5 become the 3 RuBPs. THerefore only one RuBP is destroyed and emitted as the 2 molecules of CO2 and the one PGAL.
RuBisCO is called ribulose bisphosphate carboxylase OXYGENASE, cuz of its ability to catalyse two reactions (and hence act as a carboxylase AND an oxygenase) .. 2:00
Its an awesome video, but i have one BIG QUESTION,,!!!. There is something going on down there with the PHOSPHOGLYCOLATE,, when it goes out from chloroplast, it enters in PEROXYSOMES ,,, but here take place also the MITOCHONDRIA ,, this part i dont get it,, what going on between these three organelles, they must produce something?????????
At the last step, before the regeneration of RuBP, how does 3 P from the 3 ATP --> 3 ADP + 3 P go into the formation of 3 RuBP? Wouldn't that be too many P now Because 5 G3P = 15 C, 5 P 3 ATP --> 3 ADP + 3 P Wouldn't that mean we put in 8 P when 3 RuBP only needs 6 P?
Because you are only producing enough G3P to regenerate RuBP. By producing Phosphoglycolate, you "loose carbon" that would normally be used to produce the extra G3P that is used to produce carbohydrates
around 13:30 you say 'depleting rubisco' when I think what you mean is RuBP...you make a similar mistake about half a minute later and correct yourself, but I'm pretty sure you had made the same mistake previously (at 13:30) and didn't correct yourself. thanks for the awesome videos.
i think itd be slightly better if you'd say ribuloseBISphosphate instead of ribuloseBIphosphate cuz theres a slight dofference and i know saying the former is also correct but the latter makes stuff more specific
@apatel769769 yeah, you are right. i actually understood it after watching the video but i already wrote the comment before i finished the video.. it was wrong, i understood that, but didn't see the comment so couldn't delete it.
i haven't yet watched the whole video.. watching it right now.. but how can there be 6G3P? shouldnt it be 1G3P at 3:14? May be he will correct it later on.. lemme watch the whole video!
Neo do you think that stoma can detect pathogens? It has been proven some minerals and nutrients can enter through the stoma. But what of virus? If so could a solution be genetically engineered to keep stoma from allowing certain bacteria or virus?
Why then, when I cover my tomato plant in a plastic bag during complete darkness does vapor happen? If the stoma are only active during light to transpire h20 and get C02? What is causing the vapor at night?
Is that how blight works from small wounds? or is it washed into the roots by water than taken up the stems to the leaves. I though it was entering through healthy leaves. I wonder about the gas exchange because I would like to know what is the best time to feed high amounts of CO2, is it during full sun, partial sun,dawn,or darkness.
abelcsabaika No, dark reaction means it doesn't need light directly. Like the photosystem II and I are light reactions because light hits them to excite electrons. In the dark reaction, there is no light/photons needed directly and what happens here is just the fixation of CO2
Thanks for the video. Sadly there is no explanation what actually happens with the phosphoglycolate in the peroxisome. So this video dosn't really explain photorespiration
Nawaz Sayyed Plants doesnt want to do. It happens when Concentration of O2 is greater than CO2 then O2 forcefully reacts with RUBP or if the Product of C3 cycle is present in huge amount!!
studying photosynthesis is painful
7 years later and its still painful
Lol
@@oaksoedrgh5974 so true
@@ibloo2425 My comment was 11 months ago. Now I already forgot what I learned before
Dis agr ree
i feel like you have a video for every single topic out there. you are amazing and a true blessing. thank you for all your time and help. i thought i was doomed for homeostasis but you saved me!
wow this all makes so much more sense than when my professor tries to explain these things, thank you very much for all your videos!
I'm taking biology right now just for fun and I must say there are more to learn than just engineering. I'm thrilled and fascinated by science. I really enjoy your videos. It's a lot easier to understand through videos than a textbook. Thanks again for the your videos.
skip to 8:30 for photorespiration
We need more people like you in this world!!
thanx :)
@calemontree Thank you for this! I was actually typing out the question "So when is photorespiration favoured over the normal cycle?" but lucky it had already been answered. Also, a huge thanks to you, Sal. Honestly, I don't know how I would even contemplate passing my A Levels without your videos. You understand that the generation growing up is the digital generation. The age of the best learning technique being a classroom is over. Thank goodness we have people like you, Sal.Thank you.
Which program do you use to write like that?
Awesome videos btw
@Largesoftprunes At high temperatures, plants usually close their stomata in order to conserve H2O, because if their stomata were open, their water would evaporate very quickly on hot days. When the plants stomata are closed, no gas exchange occurs which means that no CO2 is replenished and no oxygen exit the plant. As photosynthesis occurs, [CO2] decreases and [O2] increases to a point where there is a lot more O2 than CO2. Because of this, RuBisCO is more likely to fix O2 than CO2.
Applause.... You saved me from my examination
Homeostasis Exam tommorow...Challenge accepted after this vid!!! Thanks for all the help you've given me through college.
What are you doing right now :)
Awesome video, very well put together, spoke very clearly, easy to understand, great use of colours and you made it fun to learn. You should be Proud :-)
484peanut: This video is correct. Photorespiration is a process that takes place in the chloroplasts, as it is another thing that can happen in the Calvin cycle. The Calvin cycle does NOT take place in mitochondria, therefore photorespiration would NOT take place there. Perhaps you're thinking of cellular respiration? That takes place in the mitochondria. However, it is COMPLETELY different from photorespiration and if you're getting the two confused, you might want to fix that.
Your Video Is Very Useful Sharing More detail on the Calvin Cycle and Photorespiration
in photorespiration cycle taken rubp should be 3 with o2 not 5 rubp
Makes sense because carbons were not balancing.
@@misstinadolwana6886 yeah he just didn't pay attention he meant to write 3 and wrote 5, it happens
Really comprehensive and consise video. Thank you very much
11:33 shouldn't that be 3 RuBP? I don't mean to try to troll, i'm seriously asking for learning purposes.
Thank you so much! Big bio final tomorrow is completely feasable now.
So 11 years later , im now in the same situation 😂
@@arshiatalebi3217 best of luck! You’ve got this : )
Explanation of the photorespiration begins around 9:10
Is there a reason you use "Bi" instead of "Bis" when referring to RuBisCo? Is it because you're leaving out the "1,5" in "Ribulose 1,5 Bis-phosphate carboxylase oxygenase"? Great videos!
Photorespiration starts at 10:00
Nice Video That You Share , So Very Nice Thanks You More detail on the Calvin Cycle and Photorespiration
those 6 ATPs come from the Electron Transport Chain right?
+Rohit Sanjay they come from the light dependent reaction ;)
Chemiosmotic Hypothesis😉
Is The Dark Phase ( light independent phase) and Calvin cycle the same tings?
Dark reaction/Calvin cycle/C3 cycle / biosynthetic phase ~ same
awesome it is!!!everything is so clearly explained!! loved it :-P
What, are you repping Niamey or something? xD
Amazing video as usual!
When the oxygen reacts with RuBP, the phosphoglycolate produced becomes glycine, an amino acid, combines with another glycine, gives off CO2, and creates phosphoglycerate again. Therefore, 4O2+4RuBP=4phosphoglycerates+4phosphoglycolates. The 4 phpsphoglycolates become 2 phosphoglycerates and 2 molecules of CO2. So the 6 phosphoglycerates become 6 PGALs and one leaves and the other 5 become the 3 RuBPs. THerefore only one RuBP is destroyed and emitted as the 2 molecules of CO2 and the one PGAL.
RuBisCO is called ribulose bisphosphate carboxylase OXYGENASE, cuz of its ability to catalyse two reactions (and hence act as a carboxylase AND an oxygenase) .. 2:00
how can i watch next part of this video?i cant find it...
Its an awesome video, but i have one BIG QUESTION,,!!!. There is something going on down there with the PHOSPHOGLYCOLATE,, when it goes out from chloroplast, it enters in PEROXYSOMES ,,, but here take place also the MITOCHONDRIA ,, this part i dont get it,, what going on between these three organelles, they must produce something?????????
At the last step, before the regeneration of RuBP, how does 3 P from the 3 ATP --> 3 ADP + 3 P go into the formation of 3 RuBP? Wouldn't that be too many P now
Because
5 G3P = 15 C, 5 P
3 ATP --> 3 ADP + 3 P
Wouldn't that mean we put in 8 P when 3 RuBP only needs 6 P?
@ash1ocean Watch the whole video before commenting. He explains this at about the 9:00 mark.
Because you are only producing enough G3P to regenerate RuBP. By producing Phosphoglycolate, you "loose carbon" that would normally be used to produce the extra G3P that is used to produce carbohydrates
what software do you use? Thanks.
How can 5G3P produce 5 RuBP in Photorespiration? Can't it only produce 3 RuBP
That's like using 100kg flour and expecting to make a cupcake only ,can that happen?!?!?
Super helpful, thanks so much
Great video, only discrepancy it should be 1,3 Bisphosphoglycerate, not Bi
Text books do that too, it's just to make it sound less complicated
This helped a lot!Thanks 😊
If the 1st step doesn't happen, can step 2 go on?
around 13:30 you say 'depleting rubisco' when I think what you mean is RuBP...you make a similar mistake about half a minute later and correct yourself, but I'm pretty sure you had made the same mistake previously (at 13:30) and didn't correct yourself. thanks for the awesome videos.
Thanks so much, extremely helpful!
i think itd be slightly better if you'd say ribuloseBISphosphate instead of ribuloseBIphosphate cuz theres a slight dofference and i know saying the former is also correct but the latter makes stuff more specific
@apatel769769 yeah, you are right. i actually understood it after watching the video but i already wrote the comment before i finished the video.. it was wrong, i understood that, but didn't see the comment so couldn't delete it.
saved me for my exam!
You just complained about dark reactions inadequate name about 10 times in this whole playlist....:p
i haven't yet watched the whole video.. watching it right now.. but how can there be 6G3P? shouldnt it be 1G3P at 3:14? May be he will correct it later on.. lemme watch the whole video!
Thanx for this video. i have one question,
If we want to recycle the wasted CO2 then how many RuBP willl be required or regenerated?
Doesn't Photorespiration release CO2 at the end? Where exactly though???
You got your answer yet!
How photorespiration is light dependent
What? What is misspelled?
No. It is Ribulose bisphosphate Carboxylase/Oxygenase.
is PGA another name for phosphoglycerate
Where is the oxygen coming from If oxygen left as a waste product from the light dependent reaction?
I was told that stomata open during dark,and shut during light.Of any amount.Do you think this is true?
***** You are writing that the stoma close during light activity?
How does the plant breath? During the light or during the dark, when does gas exchange happen?
Neo do you think that stoma can detect pathogens? It has been proven some minerals and nutrients can enter through the stoma. But what of virus? If so could a solution be genetically engineered to keep stoma from allowing certain bacteria or virus?
Why then, when I cover my tomato plant in a plastic bag during complete darkness does vapor happen? If the stoma are only active during light to transpire h20 and get C02? What is causing the vapor at night?
Is that how blight works from small wounds? or is it washed into the roots by water than taken up the stems to the leaves. I though it was entering through healthy leaves. I wonder about the gas exchange because I would like to know what is the best time to feed high amounts of CO2, is it during full sun, partial sun,dawn,or darkness.
One thing that I don't understand: does dark reaction mean that it happens at night?? :P
abelcsabaika No, dark reaction means it doesn't need light directly. Like the photosystem II and I are light reactions because light hits them to excite electrons. In the dark reaction, there is no light/photons needed directly and what happens here is just the fixation of CO2
r/woooosh
@DawnBreaker1100 he said that
Tks very much!!!!!!!!!!!!!
skip to 9:30 if you only care about the oxygenase bit
Im so lost >.
thank you
not full photo respiration is explained here
glycerate 3-phosphate
Thanks. very helpful!
thanks q for giving new idea
ILY !!!
Thanks for the video. Sadly there is no explanation what actually happens with the phosphoglycolate in the peroxisome. So this video dosn't really explain photorespiration
yea
ty helped a lot
*Ribulose Biphosphate Carboxylase Oxygenase
my question is, why plant do photorespiration
Nawaz Sayyed Plants doesnt want to do. It happens when Concentration of O2 is greater than CO2 then O2 forcefully reacts with RUBP or if the Product of C3 cycle is present in huge amount!!
I GET IT NOW! :)
Neat!
Well....at least I can fucking spell.
AHA ich understande even from deutsch!
Hahaha touche
got my one dislike in for this video >:)
Really comprehensive and consise video. Thank you very much