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    starting a new mark scheme post your answers below


    1 a) Microalgae grow at a faster rate
    b)carbon dioxide
    c)
    d)
    i) Maintain an optimum pH
    ii) Maintain an optimum pH



    2 a) 53%
    b) glucose enter the blood through a network of capillaries
    against the concentration gradient


    3 a) thickening the uterus wall
    b) the egg was fertilised
    c) High levels of progesterone inhibit the release of LH and FSH
    corpus leutem releases progesterone
    progesterone maintains the lining of the uterus













    6 marker on fossils

    Leakey discovered homo habilus and homo erectus
    carbon-14 dating
    stratigraphy
    study tools found with the fossil
    more complex tools means a larger brain
    compare fossil to other fossil








    6 marker on Toxin gene advantages and disadvantages
    • increased crop yield
    • more food
    disadvantages
    • negative impact on the food chain
    • may lead to pests that are resistant to the toxin
    • weeds may get the gene to create the toxin which decreases crop yield
    • GM plants are expensive
    • reduction in biodiversity
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    For the one about high levels of progesterone on the graph I wrote pregnancy do you think this would get a mark?
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    Yeah definitely
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    What is the answer to the question that asked about the hormone or something? It was a one marker and one of the mid early questions in the paper (You had to write the answer yourself, it wasn't a 4 way selection choice).
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    (Original post by _IH54N_)
    What is the answer to the question that asked about the hormone or something? It was a one marker and one of the mid early questions in the paper (You had to write the answer yourself, it wasn't a 4 way selection choice).
    I think it was 'what hormone causes the release of the egg on day 14' and so that was LH
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    On the question where it said how do you make monoclonal antibodies (4marks) what did u put?
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    And what did you put for the question where it asked for a definition of circadian Rythms? (1 mark)
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    its not oxygen its carbon dioxide
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    Ah ****, i put FSH, crap!! Thanks.
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    (Original post by chrlhyms)
    its not oxygen its carbon dioxide
    could you say ammonia?
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    I got full marks on this paper. Ums was 80.
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    (Original post by chrlhyms)
    its not oxygen its carbon dioxide
    I wrote oxygen
 
 
 
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