Predict how the following conditions would affect the production of O2, ATP, and NADPH and state whether noncyclic or cyclic electron flow would occur in each;(2) blue and red photons hit a chloroplast, but no NADP+ is available

Video transcript

Welcome back. Here's our next question. Under which conditions does the non cyclic photo phosphor relation shift to cyclic photo foster relations. I'm just gonna put him up here a quick little chart to help us remember The differences between these two forms of correlation in cyclic photo correlation. The electron is recycled. It's returned to the chlorophyll molecule after it's been excited by light and gone down the electron transport chain A T. P. Is produced. But no N A D. P H is produced because the electron has not passed on to the electronic sector N A. D. P. And non cyclic photo phosphor relation. The electron has passed on to the electron except er N A D. P. After going through the electron transport chain. Therefore you've got the production of A T. P. But also the production of N A D. P. H. And we have water needed because the molecule of water needs to be lISZt in part of that reaction that produces N A D. P. H. So let's think about what would make a cell shift from non cyclic to cyclic phosphor relation. Well, choice a says when a chloroplast has low 80 p. and high end a bph. Well, this is going to be our correct answer because high end a DPH building up means we no longer need to produce anymore and a D. P. H. We need more A T. P. So that will cause a cell to shift back to this cyclic version because we don't need any more any DPH kind of a trigger to the cell. So Choice A is going to be our correct answer here. Choice. Let's look through other answers just to see why they're not correct Choice B. When a chloroplast receives less blue or red light. Um Well both involved the absorption of light. Um There's not a distinction there between those two types. So Choice B. Is not correct. Joyce C says when the chloroplast has high A P. P. And low N. A. D. P. H. Well, that wouldn't be the case because the non cyclic photo phosphor relation is what produces N. A. D. P. H. So if the cell is running low on that, it's not going to shift to the version that doesn't produce it. So, Choice C. Not a correct answer. And finally, Choice D. When the rate of transpiration is very high. Uh not going to affect this shift that we know, so not a correct answer. And so we look for under which conditions does the non cyclic photo phosphor relation shift to the cyclic form choice A. When chloroplast chloroplast has low 80 P. And high end A. V. P. H. Thanks for watching. See you in the next video