It's ok What would you say would be your biggest weakness in unit 4? For me it has to be the questions involving us to interpret a particular graph/table, and infer what its showing.
I always thought that Psychology has twice as much info than Biology. I'm so glad I've dropped all essay based subject purely because I can never finish a bunch of essays in time, plus the content is too much for me (+_+).
I would probably say that too- I have always hated graph analysis😂 I also find if the 5 markers at the back are obscure (i.e. about ATP instead of directly about photosynthesis or respiration) I fall down.
I think Biology has more content this year, especially with unit 5. Psychology you can get away with generalizing things I find, but biology is so so picky with certain things like wording!!
I would probably say that too- I have always hated graph analysis😂 I also find if the 5 markers at the back are obscure (i.e. about ATP instead of directly about photosynthesis or respiration) I fall down.
I think Biology has more content this year, especially with unit 5. Psychology you can get away with generalizing things I find, but biology is so so picky with certain things like wording!!
I usually never bother trying with the last question because of that (except the part of the question which are worth 1 marks). If I'm feeling very desperate then I usually just write a bunch of key words (i.e if it's talking about the cholorphyll, I just randomly write light pigment or something) to gain at least 1 mark on a question.
Yeah it does, and it scared and demotivated me Compared to AS, A2 is like a big bully hanging you upside down. Other exam boards are a bit better in terms of pickiness like Edexcel.
Can anyone please explain how this answer (in red) was achieved?
So ... You find out the total seed production in the fenced area and unfenced area --> fenced is 263 x 36.7 = 9652 and unfenced is 50 x 25.8 = 1290. Now you know the total seed production you calculate the percentage decrease in the seed production from the fenced to the unfenced area (as in the unfenced area is where sheets can graze) So the formula for percentage decrease is (original number - new number divided by original number x 100) this would give you 9652 - 1290 divided by 9652 x 100 = 87%
So ... You find out the total seed production in the fenced area and unfenced area --> fenced is 263 x 36.7 = 9652 and unfenced is 50 x 25.8 = 1290. Now you know the total seed production you calculate the percentage decrease in the seed production from the fenced to the unfenced area (as in the unfenced area is where sheets can graze) So the formula for percentage decrease is (original number - new number divided by original number x 100) this would give you 9652 - 1290 divided by 9652 x 100 = 87%
Thanks so much!!!!! I totally get it now! Your explanation was really clear
What's the difference between ATPase and ATPsynthase and what are their roles in the ETC?
DO not use ATPase! This is for the muscles! ATPase hydrolyses the ATP into ADP + Inorganic phosphate, to allow the myosin head to 'recock'.
ATPsynthase is used in either oxidative phosphorylation (Elec transport chain in respiration) Or- The light dependent reaction in photosynthesis
- In ETC the energy lost from the excited electrons going down the electron carriers is used to transport hydrogen atoms from the mitochondrial matrix into the intermebrane space, this then creates an electrochemical gradient and there is now a higher conc of hyrogen atoms in the intermembrane space so the H atoms down their conc gradient via the enzyme ATPsynthase, which drives the process of combining ADP + Inorganic Phosphate to form ATP
I just wanted to ask: how did you find the value 16mm... is that the height of the muscle fibre (measured vertically) or is it the width of on sarcomere (measured horizontally). Because wouldn't it have to be the height as this is the diameter?
Also, why would you divide the magnification by the value that you measured (height/width)? Is this linked to the equation from AS which is Image = Magnification x Actual size?
DO not use ATPase! This is for the muscles! ATPase hydrolyses the ATP into ADP + Inorganic phosphate, to allow the myosin head to 'recock'.
ATPsynthase is used in either oxidative phosphorylation (Elec transport chain in respiration) Or- The light dependent reaction in photosynthesis
- In ETC the energy lost from the excited electrons going down the electron carriers is used to transport hydrogen atoms from the mitochondrial matrix into the intermebrane space, this then creates an electrochemical gradient and there is now a higher conc of hyrogen atoms in the intermembrane space so the H atoms down their conc gradient via the enzyme ATPsynthase, which drives the process of combining ADP + Inorganic Phosphate to form ATP
Ohhhh!!! I totally understand it now! Thanks so much!!!
Can you pleaseeee explain the process of muscle contraction (sliding filament mechanism) with reference to ATP and ADP + Pi? I get really confused as to when each is used? And also the words "recocking" and "power stroke" ! Pleaseee!