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june 11 p11 q14 can someone please explain it ?
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it is about both the mark scheme saysHello! Can someone please explain why ans 5 b ii is not about enzyme activity with pH instead of collision with substrate
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s11_ms_22.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s11_qp_22.pdf
Yes clear thnx alotit is about both the mark scheme says
"ref. presence of hydrogen ions, partial denaturation (less steep) / denaturation (plateau);"
this means that the enzymes structure is affected by change in ph so that it does not work fully.
Also as the number of substrate molecules will decrease over time the number of collisions with the enzyme would decrease and the rate of reaction would decrease
i hope that clears it up
My Bad refer to mohammad saliks postHi !! Can someone please explain why in Q 2 F is partially permeable and G is fully permeable , shouldn't it be reverse as the outer on is always the cell wall !!
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s12_qp_21.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s12_ms_21.pdf
i was askin abt nucleus not choroplast nor mitochondriawell the reason is obvious that Chloroplast and mitochondria have internal membranes but it seemed like you need a reason why do they have internal membranes
sunny position means high temperature n hence transpiration rate is more.......if ther would be larger air space then it wil b easy for water to evaporate.....so to reduce loss of water air space iz small.........n m nt sure abt the thicknessView attachment 36770
in the question:-
"State three features of the leaf, visible in Fig. 3.1, which show that it has developed in
a sunny position."
the markscjeme mentions
>smaller air spaces
>thick leaf
I dont understand how smaller air spaces are an adaptive feature.
Nor do I undertsnad how we are supposed to know if the leaf is thick or thin because for me 450micrometres in THIN.
Can anyone please explain?
THANKS!
To me it looks like you where talking about chloroplast and mitochondriai was askin abt nucleus not choroplast nor mitochondria
Hi !! Can someone please explain why in Q 2 F is partially permeable and G is fully permeable , shouldn't it be reverse as the outer on is always the cell wall !!
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s12_qp_21.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s12_ms_21.pdf
Cell walls are semi permeable@
ZaqZainab
Cell walls Is Not F and It is Never Partially Permeable!
F is cell Membrane Which is Partially Permeable Phos-pholipid Bilayer
G is Cell Wall which is completely Permeable Because of Gaps between Cellulose Fibers, hence allows free Movement Of Water or other substances!
Hope That answers Your Question!
It is the process when ADP is phosphorylated to ATP at the inner mitochondrial membrane via energy from the ETCwhat is oxidative phosphorylation? :/
can u explain in more detail abt electron transport chain?It is the process when ADP is phosphorylated to ATP at the inner mitochondrial membrane via energy from the ETC
Reduced NAD/FAD passed to ETC, where they released the hydrogen (which gets split into H+ and e-).can u explain in more detail abt electron transport chain?
if u misunderstand i hav nothing to do...........anywayz y r we wastin tym by tokin abt dis........jst stop it nw -_-To me it looks like you where talking about chloroplast and mitochondria
You Could rephrase Your Sentence to :- The first membrane or (the membrane closest) to Cell organelles is Cell membrane and Second one is Cell wall. If we talk about this Electron Micro-graph Of two Adjacent cells.Cell walls are semi permeable
btw isn't the cell wall always the one on the outside? <--that's what my teacher has taught me
june 11 p11 q14 can someone please explain it ?
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