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    (Original post by Kingnig)
    Each row must add up to 100% of bases, so you just add up 38, 20 and 24 and subtract that from 100, then do the same for the other row
    Thank you!!
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    (Original post by jessicasydes1)
    Are you sure? My teacher just told me they can't because they leaked some stuff and about grade boundaries for different papers are different so it's unfair , I'm really stressed about it
    I'm sure I just had the reserved exam today, and people were saying that apparently AQA couldnt get the reserve papers in time to all areas
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    Name:  image.jpg
Views: 293
Size:  496.6 KB How do you do this question I'm so confused :///:
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    Can someone help with question 5(a)(i) and 5(b)?

    http://filestore.aqa.org.uk/subjects...W-QP-JUN11.PDF
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    (Original post by joannaly246)
    Name:  image.jpg
Views: 293
Size:  496.6 KB How do you do this question I'm so confused :///:
    What paper is that from?
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    (Original post by Cpie21)
    Could you sort of bullet point what you'd talk about with ions? Thanks

    Posted from TSR Mobile
    VengefulCandy has included a nice out of spec info on it which is:
    "Hydrogen carbonate ions and calcium ions are combined to form calcium carbonate in shells found in clams. However, increasing acidification of sea water by excess hydrogen ions formed by dissolving of CO2 from global warming is weakening the shells and making them brittle."

    I would also include:
    H+ Could be used in terms of photosynthesis and respiration (NADPH, NADH)
    Nitrates in nitrogen cycle
    Cl- in CFTR and inhibitory response in a synapse and in cholera.
    Oral rehydration therapy for cholera - consists of K+ to stimulate appetiate
    Ca2+ in muscle contraction and in in vivo cloning
    Mg2+ for chlorophyll production.
    Na+-K+ pump in maintaining a resting potential and its role in absorption from broken down food molecules.
    Fe2+ In haemoglobin combines with 4 O2 molecules.
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    (Original post by joannaly246)
    Name:  image.jpg
Views: 293
Size:  496.6 KB How do you do this question I'm so confused :///:
    What's the question? ._.
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    I understand what happens in action/resting potential, but can someone explain when and what is hyperpolarasation and depolarisation and what they mean etc?
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    (Original post by Thebest786)
    I understand what happens in action/resting potential, but can someone explain when and what is hyperpolarasation and depolarisation and what they mean etc?
    Depolarisation is when +40mv is reached so Na+ voyage gated channels close and K+ channels are opened causing repolarisation of the axon.

    More K+ ions diffuse out which cause the electrical gradient to fall below -70/-65 mv - hyperpolarisation.

    Posted from TSR Mobile
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    (Original post by dianajxox)
    Can someone help with question 5(a)(i) and 5(b)?

    http://filestore.aqa.org.uk/subjects...W-QP-JUN11.PDF
    Screw 5a i, I didn't get it whatsoever. For b they tell you they've already made a cut with BAMH1 so to get 3 fragments we need 2 more cuts
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    I'm screwed for tomoz


    Posted from TSR Mobile
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    (Original post by 78Saab)
    Depolarisation is when +40mv is reached so Na+ voyage gated channels close and K+ channels are opened causing repolarisation of the axon.

    More K+ ions diffuse out which cause the electrical gradient to fall below -70/-65 mv - hyperpolarisation.

    Posted from TSR Mobile
    Thanks
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    (Original post by Ozy96)
    Screw 5a i, I didn't get it whatsoever. For b they tell you they've already made a cut with BAMH1 so to get 3 fragments we need 2 more cuts
    for a) your just stating that somewhere along the base sequence of the unknown DNA there is one recognition site that Kpn1 cuts which produces the two fragments of DNA. The other cut is on plasmid.
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    (Original post by Turdasaurus Rex)
    What paper is that from?
    It's basically a exam question pack all on genetics and DNS technology
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    (Original post by Ozy96)
    What's the question? ._.
    Name:  image.jpg
Views: 159
Size:  487.7 KB Oops sorry! Here it is
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    https://www.youtube.com/watch?v=zOG4E0vEMUo
    Synoptic Essay Predictions

    Found this earlier on in the thread and thought I would share it again. Nice little video and definitely worth watching if one of the predicted essays come up!
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    does someone have 'out of spec' info for an essay on CO2
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    So if they don't get all the reserve papers out in time and some sit one paper and others the other, surely they'll have to have two separate sets of grade boundaries??
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    Some people said that if a paper is stolen and they produce a new paper etc. Then the grade boundaries are lower no matter what.
    It doesn't make sense to me though. Anyone have any ideas?
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    What the hell is sanger sequence?!

    help please!
 
 
 
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