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    (Original post by Algeriandz)
    guys how do u use transects?? (do we need to know this)
    yes, transects are used during systemic sampling to measure the distribution of species along a distance by placing down qudrats are regular constant intervals.

    and used in random sampling to create a set of axis of which you use a random number generator calculator to obtain a set of co-ordinates to place the quadrats down.
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    (Original post by noctisff)
    Attachment 550487Attachment 550487550493
    Can someone explain marking point 3? I'm not sure why the B-cell acts as an APC to itself rather than act as an APC to a T-helper cell as it releases cytokines to help the b-cell divide.
    This is the June 2014 reserve paper btw
    Can someone answer this?
    Thanks
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    (Original post by ABeingOnEarth)
    Someone answer this ^^ plz b0ss
    my teacher explained this really briefly and had said that B cells can engulf pathogens and act as APC themselves too by the antigen binding to B cell receptors.. then the normal process occurs

    whereby:
    lysosome fuses with the antigen encased by the vesicle and releases lysozymes resulting in hydrolysis
    the antigen binds to MHC which binds to the surface of the cell and acts as an APC
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    (Original post by nohaha)
    Can someone answer this?
    Thanks
    i have explained this above but its typical edexcel adding something weird, B cells acting as APC is some what controversial in some studies i have read x
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    (Original post by tayloryeah)
    my teacher explained this really briefly and had said that B cells can engulf pathogens and act as APC themselves too by the antigen binding to B cell receptors.. then the normal process occurs

    whereby:
    lysosome fuses with the antigen encased by the vesicle and releases lysozymes resulting in hydrolysis
    the antigen binds to MHC which binds to the surface of the cell and acts as an APC
    hey can u explain what we need to know about restriction enzymes?


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    (Original post by tayloryeah)
    i have explained this above but its typical edexcel adding something weird, B cells acting as APC is some what controversial in some studies i have read x
    Thanks a lot
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    What core practicals do we need to learn???
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    (Original post by ameep22)
    Does anyone know where we can access the Jan 2016 international paper for unit 4. Also is there at june 2015 r unit 4 paper because I cannot seem to find it.
    I found it! https://drive.google.com/folderview?...nR2ZW5PcGhLQWM

    Enjoy..
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    Does anyone have Jan 2016 6BI04 Paper ( not the IAL)?
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    (Original post by nohaha)
    Does anyone have Jan 2016 6BI04 Paper ( not the IAL)?
    I think the only January papers, after Jan 2013, are IAL papers??
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    Anyone got model answers for some questions
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    (Original post by nohaha)
    Does anyone have Jan 2016 6BI04 Paper ( not the IAL)?
    There is no exam paper for Jan 2016 that isn't IAL. Normal A Level exams no longer take place in Jan, just June.
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    Here is the link to a word document I made containing the scientific articles predicted Q and As:

    https://drive.google.com/open?id=0By...kdFdXlJSDdQZWs

    Mind maps:

    https://drive.google.com/open?id=0By...jF1SHJVb3J4S28
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    (Original post by fpmaniac)
    Anyone got model answers for some questions
    Unit 4 general mark scheme answers here:

    https://drive.google.com/drive/u/0/f...kdFdXlJSDdQZWs
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    (Original post by fpmaniac)
    What core practicals do we need to learn???
    - observing patterns by ecological studies
    - the effect of temperature on the hatching of brine shrimp/ germination of seeds
    - effects of different antibiotics on bacteria
    - Gel electropheresis
    - PCR
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    (Original post by .JC.)
    If anyone fancies doing some revision on Skype tonight, add me: c-r-a-b-i

    There should be several others of us on so don't worry it won't be a dinner date :lol:

    Also, here is the link to a word document I made containing the scientific articles predicted Q and As:

    https://drive.google.com/open?id=0By...kdFdXlJSDdQZWs

    Edit: I am the gift that keep on giving, I've uploaded revision notes by topic to that google drive.

    Edit 2: For those who missed them, here are mind maps by topic that I made a while ago:

    https://drive.google.com/open?id=0By...jF1SHJVb3J4S28
    thanks biology lord
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    (Original post by tayloryeah)
    thanks biology lord
    Amen.
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    Not looking forward to this, I really hate Edexcel's questions sometimes, the mark scheme says completely different things sometimes. Best of luck folks.
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    (Original post by .JC.)
    If anyone fancies doing some revision on Skype tonight, add me: c-r-a-b-i

    There should be several others of us on so don't worry it won't be a dinner date :lol:

    Also, here is the link to a word document I made containing the scientific articles predicted Q and As:

    https://drive.google.com/open?id=0By...kdFdXlJSDdQZWs

    Edit: I am the gift that keep on giving, I've uploaded revision notes by topic to that google drive.

    Edit 2: For those who missed them, here are mind maps by topic that I made a while ago:

    https://drive.google.com/open?id=0By...jF1SHJVb3J4S28

    I thought my own set of notes were good but these are :perv::perv:
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    (Original post by rory58824)
    Not looking forward to this, I really hate Edexcel's questions sometimes, the mark scheme says completely different things sometimes. Best of luck folks.
    Just do all the previous past papers and you'll be fine. There may be some things that come up that haven't done previously, but just revising past questions is enough to get you an A/A* provided you get them spot on.
 
 
 
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