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    Hey can anyone give me the link for the mark scheme for Tuesday 8TH JUNE 2008 TRANSPORT LEGACY paper? I would really appreciate it. Thanks
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    (Original post by Rosi M)
    Hey can anyone give me the link for the mark scheme for Tuesday 8TH JUNE 2008 TRANSPORT LEGACY paper? I would really appreciate it. Thanks
    would u really appreciate it???
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    (Original post by fahimak)
    would u really appreciate it???
    Haha shut up you! I hate it its so frustrating when you've done a paper and no mark scheme! Dont just sit there.. get looking!!
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    chek on paper bank. it'll probs be on there
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    [QUOTE=fahimak;29275176]
    (Original post by Rosi M)
    Haha shut up you! I hate it its so frustrating when you've done a paper and no mark scheme! Dont just sit there.. get looking!! [/Q
    chek on paper bank. it'll probs be on there
    Yep I found it. Thanks Hows revision going?
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    hey can anyone explain fetal haemoglobin 2 me plz???
    still dont understand it :confused:
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    [QUOTE=Rosi M;29275198]
    (Original post by fahimak)

    Yep I found it. Thanks Hows revision going?
    jus got plants left...urs??
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    [QUOTE=fahimak;29275234]
    (Original post by Rosi M)

    jus got plants left...urs??
    Done all the learning. Past papers now!
    Shall I explain to you?
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    (Original post by fahimak)
    hey can anyone explain fetal haemoglobin 2 me plz???
    still dont understand it :confused:
    Done all the learning. Past papers now!
    Shall I explain to you?
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    [QUOTE=Rosi M;29275255]
    (Original post by fahimak)

    Done all the learning. Past papers now!
    Shall I explain to you?
    yeh plz if u dont mind
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    [QUOTE=fahimak;29275292]
    (Original post by Rosi M)

    yeh plz if u dont mind
    lol nope course I don't.
    Ok basically you only have a few points to learn.

    1) Fetal haemoglobin has a higher AFFINITY to oxygen than adult heamoglobin (so the haemoglobin of the fetus is attracted more strongly to oxygen than the mothers haemoglobin)

    2) It has a HIGHER AFFINITY because it needs to pick up oxygen from an environment which has a LOW PARTIAL PRESSURE OF OXYGEN so low oxygen concentration.

    3) The fetus has to pick up oxygen from the placenta which has a low partial pressure of oxygen 'cos the tissues in the mothers placenta obviously using the oxygen for respiration.

    4) The low partial pressure of oxygen causes the adult haemoglobin to release oxygen which the fetus picks up.

    So the curve for fetus is higher than adult.
    You understand?
    Correct me if im wrong anyone
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    (Original post by fahimak)

    yeh plz if u dont mind
    lol nope course I don't.
    Ok basically you only have a few points to learn.

    1) Fetal haemoglobin has a higher AFFINITY to oxygen than adult heamoglobin (so the haemoglobin of the fetus is attracted more strongly to oxygen than the mothers haemoglobin)

    2) It has a HIGHER AFFINITY because it needs to pick up oxygen from an environment which has a LOW PARTIAL PRESSURE OF OXYGEN so low oxygen concentration.

    3) The fetus has to pick up oxygen from the placenta which has a low partial pressure of oxygen 'cos the tissues in the mothers placenta obviously using the oxygen for respiration.

    4) The low partial pressure of oxygen causes the adult haemoglobin to release oxygen which the fetus picks up.

    So the curve for fetus is higher than adult.
    You understand?
    Correct me if im wrong anyone
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    fnx Rosi M
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    (Original post by fahimak)
    fnx Rosi M
    Your welcome fahimak
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    Thanks alot giraffegiraffe!!
    • Thread Starter
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    (Original post by Rosi M)
    Hmm Im really confident that mitosis is coming in because it hasn't for a while.. the stages and all of that.
    Are you certain it hasnt came up in recent ones?
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    (Original post by xMaGic)
    Are you certain it hasnt came up in recent ones?
    Yep pretty sure. In the most recent paper which was may 2010, the only thing that came up was something on homologous pairs and having to draw chromosomes in a sperm cell (how they would look).. nothing on the stages of mitosis or any of that. So im thinking there is a good chance we may have it.
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    (Original post by xMaGic)
    Thanks alot giraffegiraffe!!
    no problem, glad it helped!
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    (Original post by giraffegiraffe)
    Do we have to know much about the cambium except that its where stem cells are in the plant and where mitosis happens to form new xylem/phloem?
    Yeah thats all really. Thats where the meristem cells are found which divide to form new cells.
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    i bet theres going to be a 5 marker on setting up a potometer.
 
 
 
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