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OCR Biology F212 Revision [3rd June 2013] (Now Closed) Watch

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    (Original post by Nas.)
    I'm gonna need to cover the whole unit in a day.
    Quite a tall order :confused:
    How comes you only have one day. Btw have you done any papers yet?
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    (Original post by Shadow_Amber)
    These are notes posted by lexafish on f212 specification. http://www.thestudentroom.co.uk/show....php?t=1296764
    Thanks for that, exactly the sort I needed.
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    (Original post by Nas.)
    I'm gonna need to cover the whole unit in a day.
    Quite a tall order :confused:
    Same!
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    manchesterunited15 and Nas You can do it.
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    anyone got questions they need answering?
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    (Original post by Shadow_Amber)
    manchesterunited15 and Nas You can do it.
    Thanks for the support
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    (Original post by Shadow_Amber)
    How comes you only have one day. Btw have you done any papers yet?
    Large amount of 'issues' going on at home, and also being ill, prevented me from revising as was necessary, i've started some papers.
    Anyways, i'm off to sleep now, good luck with your revision, and you too manutd15!
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    (Original post by oak12)
    anyone got questions they need answering?
    suggest why the infective agent is able to ‘take control’ once it has entered the T lymphocytes, the markscheme answer is different to what I thought.
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    3c,

    Continuous Variation:

    - shows a range of characteristics, there can be intermediate or inbetween types
    - controlled by both genes and environment
    - the control by genes is normally by polygenes (a few genes)
    - often shows a normal distribution, with (mean) most common in the middle, and less common extremes
    - example in bat maybe wingspan

    Discontinuous Variation:

    - characteristics fall into set groups
    - there is no inbetween characteristics
    - just affected by genes
    - normally a single gene
    - example in bat maybe sex
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    Just did the Jan 2012 as a mock. 100/100.

    Lol, knew I'd get negged.
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    if it is the case of HIV,

    then the virus can take over the cells dna, hence its genetic machinery

    so the virus can use the cell to make copies of itself

    the virus reproduces inside the cell

    until it bursts

    destroying the cell

    in the case of HIV, destroys t cells

    so t helper cells cant be made

    so b cells cant be stimulated

    so plasma cells and antibodies are not produced

    so not specific immune response to pathogens
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    (Original post by felamaslen)
    Just did the Jan 2012 as a mock. 100/100.
    WOW well done. You are definitely ready.
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    [QUOTE=oak12;42914512]

    Thank you for the help, it makes sense now.
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    anything else?
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    (Original post by oak12)
    anything else?
    Atm no. How comes you are still awake???
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    the minds active!
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    anyone else with any questions?
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    ok

    im signing off

    hopefully catch up later
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    I guess I'm not the only one still revising at 4am
    Goodnight/morning guys :cool:
    We got this...
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    just finished revision, going to bed!
 
 
 
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