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AQA BIOL1 Biology Unit 1 Exam - 16th May 2011 watch

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    (Original post by EffKayy)
    Aah! Thanks!
    All the stuff on osmosis, diffusion, active transport will come up but i'm wondering how? And in what context :L

    I'm sat here freaking out over the exam.


    Hmm.. they could link osmosis to something like Chloera? Active transport and diffusion probs with the digestion of starch?

    Awh don't you'll be fine!
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    Going over biol1....since the start of 2day....almost finsihed....gnna do some biol2 papers -_-
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    (Original post by liviaaa)
    Haha yeah exactly

    Ermm it's going okay. I feel quite prepared (after I've finished doing this immunology to death) , but I'll go into the exam and they'll always be some stupid question that was miles beyond the spec which no one can prepare for haha. You?
    I've just finish revising like gone through all my notes I'm on a break at the moment, I'll do a couple of past papers before bed.
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    (Original post by liviaaa)


    Hmm.. they could link osmosis to something like Chloera? Active transport and diffusion probs with the digestion of starch?

    Awh don't you'll be fine!
    Can we both post notes here, it'll reinforce my knowledge (and yours).

    AQA are so annoying. On a specimen paper, they asked about emphysema and how it can cause tiredness, and i learnt the markscheme for that and wrote it in the exam, only waiting to find out that the jan11 markscheme was completely different, even though they asked the same question.
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    I'm thinking it will be about describing the chain of events of what happens when a foreign antigen(on a pathogen) is detected in the body, from detection by phagocytes and phagocytosis, the displaying of antigens on the cell membrane which activates T-cells in cell-mediated immunity, then about T-cells attacking pathogens directly and activating B-cells to divide into memory cells and plasma cells which release antibodies, and how antibodies work etc. I'm sure a reference about primary and secondary immune response won't go amiss here either.
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    (Original post by Limitless)
    I've just finish revising like gone through all my notes I'm on a break at the moment, I'll do a couple of past papers before bed.
    Yeah I'm going to have a break for Britains Got Talent, then past papers tomorrow.
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    Good luck! I'm doing B2 on Thursday!
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    (Original post by AspiringGenius)
    Good luck! I'm doing B2 on Thursday!
    Thanks You mean a week on Thursday?
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    I'm gonna go over all my notes again to check I know it all and a few past papers.
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    (Original post by liviaaa)
    Thanks You mean a week on Thursday?
    My exam timetable says Thursday 19th. I can't understand why I messed up, it wasn't even hard! >_<
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    (Original post by AspiringGenius)
    My exam timetable says Thursday 19th. I can't understand why I messed up, it wasn't even hard! >_<
    Are you AQA? As the biology 2 is on the 26th?
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    Yes AQA biology is 26th.

    edit: For unit 2 that is.
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    (Original post by liviaaa)
    Are you AQA? As the biology 2 is on the 26th?
    I'll check that out at school. I suppose they're not putting it down a week late
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    Can we have a Q&A thing??
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    (Original post by EffKayy)
    Can we have a Q&A thing??
    Okayy..

    How is the structure of the plasma membrane adapted to it's function?
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    I am terrified of this exam! :cry2:
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    (Original post by Sparkly-Star)
    I am terrified of this exam! :cry2:
    Don't be! I'm sure you'll be alright! What did you get in the Jan exam?
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    I need to get an A in this exam..... soo not going to happen im soo worried! ive done so much revision but i always do badly in exams
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    this is a good thread!!!
    i expect a lot of stuff on immunity and heart aswell, although there was quite a bit of heart on the june 2010 so....
    i just hate the 'how science works' questions! and the way the questions are worded is absolutely mental!! will let you know how i get on afterwards and we can compare our answers!
    good luck everyone!!!!!
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    (Original post by liviaaa)
    Okayy..

    How is the structure of the plasma membrane adapted to it's function?
    Wow that's pretty broad, erm...

    The plasma membrane is made up of phospholipids with a phosphate group which is hydrophilic and a fatty acid chain which is hydrophobic. Therefore, a bilayer with the phosphate group facing outwards and the fatty acid interacting with each other could maintain two environments with different conditions. The phospholipids will also allow only lipid soluble substances such as hormones and small substances such as carbon dioxide and oxygen to diffuse freely across the membrane (selectively permeable to be able to set up a concentration gradient with certain substances). The phospholipids are also flexible (fluid) so can move relative to each other and form vesicles for phagocytosis or exocytosis. It also allows proteins fit in the membrane to form channel/carrier proteins for the facilitated diffusion/active transport of ions or larger water-soluble substances across the membrane (intrinsic) or extrinsic proteins for cell recognition and for cells to adhere together.

    How does asthma affect the rate of diffusion of oxygen?
 
 
 
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