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    (Original post by iesians)
    yup ! decarboxylases is righteo too !!

    never hear dof phosphofr.......wa ??!
    explain its function please
    Phosphofructokinase is the enzyme responsible for phosphorylating the hexose-phosphate in the phosphorylation of glucose in glycolysis (it actually phosphorylates fructose-phosphate to fructose-diphosphate, but we don't have to learn all the little bits of gycolysis like the isomerism step and the product names - just that glucose is phosphorylated to activate it and stop it leaving the cell, then split to give 2x GALP, then converted through a series of intermediates to produce pyruvate, and obviously the amount of ATP produced and NAD reduced). It is the rate determining enzyme of respiration - the rate of respiration is dependant on how fast this enzyme can phosphorylate the sugar. High levels of ATP and/or citrate inhibit phosphofructokinase (reduce rate of respiration, slowing production of pyruvate), low levels of ATP/citrate or high levels of ADP activate the enzyme (increase rate of respiration and production of pyruvate).
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    (Original post by This Honest)
    :rofl3: awww silly girl
    Lol thats not very nice


    This was posted from The Student Room's iPhone/iPad
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    (Original post by i Pav i)
    Does anyone know ALL of the core experiments we should know for Unit 5?

    e.g. The woodlice and measuring oxygen uptake..

    There's other ones that I can't remember?

    Thanks!
    I think its just the woodlice, habituation (snails), effects of exercise on tidal volume and breathing rate, the spirometer one (measuring rate of O2 uptake), and thats all i have in my notes think thats it


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    (Original post by 19941994)
    I think its just the woodlice, habituation (snails), effects of exercise on tidal volume and breathing rate, the spirometer one (measuring rate of O2 uptake), and thats all i have in my notes think thats it


    This was posted from The Student Room's iPhone/iPad
    The woodlice one came up in Jan 2012.
    The spirometer came up in June 2011.

    So I think I'll focus on the habituation!
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    (Original post by 19941994)
    Lol thats not very nice


    This was posted from The Student Room's iPhone/iPad
    But the thread title says edexcel....
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    Explain how an increase in Heart Rate occurs from exercise (4 Marks )
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    (Original post by ConnorB)
    Explain how an increase in Heart Rate occurs from exercise (4 Marks )
    more co2 produced
    chemoreceptors detect increase in co2 and send nerve impulses to medulla
    medulla sends nerve impulses to heart via sympathetic nervous system to depolarise SAN
    depolarisation of SAN increases which increases the heart rate
    ???
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    Can someone explain what a transcription factor is and does?
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    (Original post by This Honest)
    more co2 produced
    chemoreceptors detect increase in co2 and send nerve impulses to medulla
    medulla sends nerve impulses to heart via sympathetic nervous system to depolarise SAN
    depolarisation of SAN increases which increases the heart rate
    ???
    the chemoreceptors are resposible for the ventilation rate not the heart rate when it detect that there is an increase in the co2 and decrease in the ph it sends to the inspiratory center in the medulla
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    Can someone tell me in UMS..

    out of 120..

    What an
    A* -
    A -
    B - 84/120
    C -
    D -

    I know that 84/120 is what you need for a B..
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    (Original post by This Honest)
    But the thread title says edexcel....
    She probably didnt read it all and just saw biology unit 5 lol. Anyway, oh wells


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    what is the role of myoglobin need 3 points (there are 3 marks for this qu)??!!
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    (Original post by i Pav i)
    Can someone tell me in UMS..

    out of 120..

    What an
    A* -
    A -
    B - 84/120
    C -
    D -

    I know that 84/120 is what you need for a B..
    Its about 53/54 raw marks for a B


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    (Original post by DarrenDM)
    Can someone explain what a transcription factor is and does?
    Protein that binds to a DNA of a gene, causing transcription of it into mRNA, effectively "switching the gene on".
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    (Original post by i Pav i)
    Can someone tell me in UMS..

    out of 120..

    What an
    A* -
    A -
    B - 84/120
    C -
    D -

    I know that 84/120 is what you need for a B..
    Oh sorry i thought you wanted raw marks lol, heres the link:

    http://www.edexcel.com/iwantto/I%20w...%20UMS_web.pdf


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    (Original post by i pav i)
    can someone tell me in ums..

    Out of 120..

    What an
    a* -
    a -
    b - 84/120
    c -
    d -

    i know that 84/120 is what you need for a b..
    a* = 108
    a = 96
    b = 84
    c = 72
    d = 60
    e = 48
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    (Original post by i pav i)
    can someone tell me in ums..

    Out of 120..

    What an
    a* -
    a -
    b - 84/120
    c -
    d -

    i know that 84/120 is what you need for a b..
    a* -108
    a - 96
    b - 84
    c - 72
    d - 60
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    what type of molecules are NAD and FAD? like are they co enzymes or something?
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    (Original post by nadzzdan)
    what type of molecules are NAD and FAD? like are they co enzymes or something?
    ya they are conzymes
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    (Original post by This Honest)
    more co2 produced
    chemoreceptors detect increase in co2 and send nerve impulses to medulla
    medulla sends nerve impulses to heart via sympathetic nervous system to depolarise SAN
    depolarisation of SAN increases which increases the heart rate
    ???
    You're pretty much bang on Though i'm nitpicking a bit here, where are the chemoreceptors located which detect the lower Ph caused by the increase in Co2?
 
 
 
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