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AQA BYB2 9th Jan 2008 Exam watch

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    How did everyone find this exam?

    Seemed pretty straight forward except for maybe the Stem Cell question

    I think one of the answers could have something to with no rejection as stem cells are from the patient and the other to do with no need for repeat prescription of gene as white blood cells are being made.
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    I put
    -It is more advantageous than using bacterium or virus to insert the gene as the child has a weakened immune system and it may be fatal or cause serious side effects
    -White blood cells cannot be synthesised in the lab so stem cells must be used as they can produce white blood cells
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    Does anyone know what the grade boundaries are, I didnt finish so I know I deffo lost 6 marks and I was hoping for a high A.
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    something like 62% for a B and 72% for an A
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    conversion to ums is about x1.9 if that helps...

    for the Q about stem cells i put
    1) many diffrent types of WBC's and stem cells can become any of them, and so can produce more of one if needed
    2)by using stem cells from them it reduces risk of rejection from the body...

    i liked the graph for that question lol, seen one similar before :P

    Seemed to be an awful lot on DNA this time. Also what two things can be produced in GM bacterial cells, i got insulin and then took a stab in the dark with alpha-1-antitrypsin, prolly not AAT but meh..
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    (Original post by pharmahopeful07)
    something like 62% for a B and 72% for an A
    From the examiners report for the BYB2 exam in jan 07 and june 07 the raw mark required for an A was 35 and 36 out of 54 respectively. This comes to about 65%.

    Does this mean that you can still achieve 90/90 ums despite not getting 54/54 raw marks?
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    (Original post by north_western_manc)
    Also what two things can be produced in GM bacterial cells, i got insulin and then took a stab in the dark with alpha-1-antitrypsin, prolly not AAT but meh..

    I thought that question said name two micro-organism than are used in genetic engineering?

    I put down adenoviruses and lyposomes
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    the mark boundaries are mightily confusing!
    last year and thus why i retook i got this on the marks sheet i got in august
    1:63/90 B
    2:61/90 C
    3:92/120 B

    which i think means
    38/54
    37/54
    43/54 + 23 from coursework. i'm a bit sketchy about this one, mixture of percentages and actual marks!
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    From AQA website for june '07

    Unit - Max mark A B C D E
    BYB1 GCE BIOLOGY B UNIT 1 54 33 28 24 20 16
    BYB2 GCE BIOLOGY B UNIT 2 54 35 30 26 22 18
    BYB3/W GCE BIOLOGY B UNIT 3 - WRITTEN 75 54 50 46 42 38
    BYB3/C GCE BIOLOGY B UNIT 3 - COURSEWORK 45 38 32 27 23 18
 
 
 

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