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.
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
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.
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 :-)
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?????????
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.
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?
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!
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
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
@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.
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 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!!
