Sandy_Vega30
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Hey guys! Who else is giving Unit 4 this June? How is your revision so far?
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Sandy_Vega30
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My main problem with Unit 4 is the timing. I am fine with the content and all but does anybody have any tips for time management? I mean both Unit 6 and 4 have the same time but one is for 50 marks and the other is for 90 marks. I really don't know how to finish the paper in time. Please help!
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Aimen.
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(Original post by Sandy_Vega30)
My main problem with Unit 4 is the timing. I am fine with the content and all but does anybody have any tips for time management? I mean both Unit 6 and 4 have the same time but one is for 50 marks and the other is for 90 marks. I really don't know how to finish the paper in time. Please help!
I have issues with time aswell! I take atleast 20 minutes extra!
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Sandy_Vega30
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(Original post by Aimen.)
I have issues with time aswell! I take atleast 20 minutes extra!
Me too! How are you planning on keeping within the time limit? Is there any tricks for that?
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Aimen.
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(Original post by Sandy_Vega30)
Me too! How are you planning on keeping within the time limit? Is there any tricks for that?
I don't really know but I guess I'll divide time as 10 minutes per question at the begining!
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Sandy_Vega30
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(Original post by Aimen.)
I don't really know but I guess I'll divide time as 10 minutes per question at the begining!
Oh. I guess i'll give that a go. Which topic do you find the most frustrating to answer questions about? Coz Unit 4 theory is simple but its the questions that give you a headache.
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Aimen.
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(Original post by Sandy_Vega30)
Oh. I guess i'll give that a go. Which topic do you find the most frustrating to answer questions about? Coz Unit 4 theory is simple but its the questions that give you a headache.
Just a bit of trouble with cyclic and non-cyclic phosphorylation, as it isn't in the spec and it's confusing, rest is fine.
eeerrrr except immunity (T-cell and B-cell ****)
Hby?
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Sandy_Vega30
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(Original post by Aimen.)
Just a bit of trouble with cyclic and non-cyclic phosphorylation, as it isn't in the spec and it's confusing, rest is fine.
eeerrrr except immunity (T-cell and B-cell ****)
Hby?
All of the ecology ****. I understand the theory but answering questions is always confusing. I never get the full marks for that question. i.e if it is a 3 marks question, i get 1 or 2. I just don't know where I am going wrong. How do you feel about Ecology?
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PlayerBB
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(Original post by Sandy_Vega30)
All of the ecology ****. I understand the theory but answering questions is always confusing. I never get the full marks for that question. i.e if it is a 3 marks question, i get 1 or 2. I just don't know where I am going wrong. How do you feel about Ecology?
I am also really struggling with ecology , the questions just seem unfamiliar but I guess with practice, we will get there
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PlayerBB
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(Original post by Aimen.)
Just a bit of trouble with cyclic and non-cyclic phosphorylation, as it isn't in the spec and it's confusing, rest is fine.
eeerrrr except immunity (T-cell and B-cell ****)
Hby?
Hey, can you specify what exactly you don't understand in cyclic and non-cyclic phosphorylation, I think I might be able to help somehow!
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Sandy_Vega30
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(Original post by PlayerBB)
I am also really struggling with ecology , the questions just seem unfamiliar but I guess with practice, we will get there
How do you plan on practicing to answer ecology questions apart from past paper practice? Do you have any extra notes that might help?
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Aimen.
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(Original post by Sandy_Vega30)
All of the ecology ****. I understand the theory but answering questions is always confusing. I never get the full marks for that question. i.e if it is a 3 marks question, i get 1 or 2. I just don't know where I am going wrong. How do you feel about Ecology?
Same. Theory is easy but no matter whatever I write in past paper questions, there's always something missing :/ but the boundaries are fine unlike chem 5
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Aimen.
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(Original post by PlayerBB)
Hey, can you specify what exactly you don't understand in cyclic and non-cyclic phosphorylation, I think I might be able to help somehow!
I kinda get cyclic thing but I don't understand the electron flow in non-cyclic. It'd be sooooo great of you if you could explain me x)
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(Original post by Aimen.)
I kinda get cyclic thing but I don't understand the electron flow in non-cyclic. It'd be sooooo great of you if you could explain me x)
Yeah sure, I am glad to explain but would you mind If I do it tomorrow morning because I am little tired and need to finish the paper I am solving!
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Aimen.
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(Original post by PlayerBB)
Yeah sure, I am glad to explain but would you mind If I do it tomorrow morning because I am little tired and need to finish the paper I am solving!
Sure, I'd be counting on you x)
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(Original post by Aimen.)
Sure, I'd be counting on you x)
Okay, to understand it thouroughly, you have to imagine like a it is happening in front of you, use your imagination....

In non-cyclic phophorylation, both PSI and PSII are involved. It is called non cyclic, because it doesn't involve any cycle, it's just reactions involving PSI and PSII.
1) Dissociation of water occur spontaneously, producing H+ and OH- , When light shines, the electrons in both PSI and PSII get excited. Let's begin with PSI, the electron gains energy and rise to a higher energy level, it is picked by the electron acceptor NADP, at the same time NADP accepts an H+ ion that was produced from the dissociation of water to become reduced NADP and that will be used in the Calvin Cycle late on.

2) The electron excited from PSII, rise as well to higher energy level, it is picked by another electron acceptor (NOT NADP) and then it is passed along the electron transport chain where it loses energy, this energy is used to form ATP from ADP and Pi group. then this electron proceeds to PSI, so PSI has gained the lost electron, however, PSII become unstable due to being in shortage of one electron so what happens is, OH- ions that are produced from the dissociation of water lose 4e to PSII to form O2 and 2H2O, 4OH- + 4e = O2 + 2H2O, this process is know as photolysis. So PSII has gained the lost electron, it is stable once again and the process repeats from there

Hope you have understood!!
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Aimen.
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(Original post by PlayerBB)
Okay, to understand it thouroughly, you have to imagine like a it is happening in front of you, use your imagination....

In non-cyclic phophorylation, both PSI and PSII are involved. It is called non cyclic, because it doesn't involve any cycle, it's just reactions involving PSI and PSII.
1) Dissociation of water occur spontaneously, producing H+ and OH- , When light shines, the electrons in both PSI and PSII get excited. Let's begin with PSI, the electron gains energy and rise to a higher energy level, it is picked by the electron acceptor NADP, at the same time NADP accepts an H+ ion that was produced from the dissociation of water to become reduced NADP and that will be used in the Calvin Cycle late on.

2) The electron excited from PSII, rise as well to higher energy level, it is picked by another electron acceptor (NOT NADP) and then it is passed along the electron transport chain where it loses energy, this energy is used to form ATP from ADP and Pi group. then this electron proceeds to PSI, so PSI has gained the lost electron, however, PSII become unstable due to being in shortage of one electron so what happens is, OH- ions that are produced from the dissociation of water lose 4e to PSII to form O2 and 2H2O, 4OH- + 4e = O2 + 2H2O, this process is know as photolysis. So PSII has gained the lost electron, it is stable once again and the process repeats from there

Hope you have understood!!
Yesssss, thankyou! That was awesome!:bban:
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PlayerBB
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(Original post by Aimen.)
Yesssss, thankyou! That was awesome!:bban:
No problem, glad I helped!!
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Annaaix_
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That thing involving cd4, with the binding on the receptors and b cells and t cells and basically the whole of immunity ffs If anyone has any notes for immunity I'd be so grateful! x
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Sandy_Vega30
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(Original post by Annaaix_)
That thing involving cd4, with the binding on the receptors and b cells and t cells and basically the whole of immunity ffs If anyone has any notes for immunity I'd be so grateful! x
This has all the mind maps required for Unit 4. Its well broken down and simple. Hope this helps!

https://drive.google.com/folderview?...JVb3J4S28#grid
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