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    To kinda conclude...
    I'm no master at biology but got pretty high UMS last year (288/300) and did pretty extensive revision for BY4. What I can say is that for this paper there was very little 'standard recall' - even the easiest questions had some level of ambiguity, more than I've ever seen in any of the other BY4's. For the other years the average raw mark for an A* is 67/80 - I'm going to guess much lower than that for this year, because other than the synapses/photosynthesis/kidneys I would say every question as harder than your average question on the subject (except for the 10 marker). I do have one question: use of ATP in muscle cells: I wrote active transport because, although my knowledge isn't great that what I think causes muscle contraction. Too complex? Have a feeling just muscle contraction will get the mark
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    (Original post by Zwitterion1)
    Exactly the same as what I said, K+ channels begin to denature so less k+ diffuse out
    the question said that temperature controls how they open so i dont think its about denaturing also 37 degrees is pretty low temp
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    (Original post by matt1997x)
    Does anyone know the flexibility of the markers for exams like this? Because there was loads of application they'll be getting a lot of different answers. I also saw this thing where the mark schemes that markers get are different to the ones we get online. Apparently the ones online are simplified to contain the core answer. So maybe questions you thought you got disastriously wrong may actually be right, because the questions on that paper today had many different scopes.
    What you said was absolutely correct - there is a much broader mark scheme that isn't released, which contains many more marking points for questions than the ones that are released online do - they are the ones that are released beforehand, and then the examiners have a meeting and suggest what other marking points could be on there that are correct, so the final mark scheme is a much more lenient one.
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    (Original post by Mango88)
    Damn
    haha aw not to worry! it was only a couple of marks i think!
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    (Original post by samwray)
    To kinda conclude...
    I'm no master at biology but got pretty high UMS last year (288/300) and did pretty extensive revision for BY4. What I can say is that for this paper there was very little 'standard recall' - even the easiest questions had some level of ambiguity, more than I've ever seen in any of the other BY4's. For the other years the average raw mark for an A* is 67/80 - I'm going to guess much lower than that for this year, because other than the synapses/photosynthesis/kidneys I would say every question as harder than your average question on the subject (except for the 10 marker). I do have one question: use of ATP in muscle cells: I wrote active transport because, although my knowledge isn't great that what I think causes muscle contraction. Too complex? Have a feeling just muscle contraction will get the mark
    I wrote active transport as well.
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    The question about K+ ion pumps and the effect on the ion channels is I think to do with increasing temperature increasing the speed at which the K+ channels open and close, so when the temperature is raised you would get the K+ ion channels opening quicker (halting depolarisation) and closing quicker (halting the refractory period) explaining why a temperature increase brings about an action potential of less magnitude
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    aw I just put muscle contraction for that one.
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    I put muscle contraction too
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    Hey everyone. I didn't find the paper that bad and now I'm worrying because everyone is saying it was really hard! The 23 degrees and 37 degrees one threw me and I didn't know about cocaine, kinda used the diagram to make it up! What do people think grade boundaries will be? I'm worried now! Does anyone wanna try and put together an unofficial mark scheme?
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    Yeah is anyone willing to attempt Unofficial markscheme?
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    That exam was awful, all application no simple questions and way too much detail on the AS topics. Every question was weirdly worded and no questions from previous year had been repeated (apart from the lovely 10 marker), unofficial mark scheme anyone?
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    (Original post by alevelsarepoo)
    Hey everyone. I didn't find the paper that bad and now I'm worrying because everyone is saying it was really hard! The 23 degrees and 37 degrees one threw me and I didn't know about cocaine, kinda used the diagram to make it up! What do people think grade boundaries will be? I'm worried now! Does anyone wanna try and put together an unofficial mark scheme?
    Im willing if you are..😉
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    (Original post by Mr Average.98)
    Im willing if you are..😉
    can give input if needed, remember most of the exam
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    i need an A in bio and to get an A overall ill need an A* in by4, feel like that is impossible now. Feel like ive lost at least 18-20 marks 😭, weirdest exams ive ever sat. I couldnt even answer the cocaine question properly because the diagram confused me.
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    OMG.. pheww. That Bt bacteria question . That was actually CHEMICAL control agent . Many argue if it was biological or chrmical. But its definitely chemical. Name:  Screenshot_2016-06-16-21-04-18-1.png
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    (Original post by Mr Average.98)
    Im willing if you are..😉
    Yeah I'd be happy to, never made one before though so this would be new! I wrote biological control ;(
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    Hi, i did HB4 and also found it quite hard. These are my answers for what i remember, i know a few are wrong:

    first page was: azotobator, diffusion for nitrates into roots, nitrification aerating the soil by ploughing,

    spreading organic manure, planting leguminous plants between seasonsthen

    next page:myofibrils, actin, quaternary, tertiary

    then A and D

    sq, something , w, ,w, something

    for the why glucose left in filtrate for diabetes people, saying not enough sodium ions present to get diffuse in with glucose via co-transport

    180 and 60 for the numbers

    why more would diffuse at end of pct: it would be more concentrated as less water present at bottom

    carbon dioxide fixing: inorganic to organic compound

    hydrolysis of acetyl choline: adding a molecule of water, forming ethanoic acid and choline

    Thats all i remember
    Thanks
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    It was biological control for sure

    Chemical control would be something like DDT. The Bt is a bacteria, not a chemical so it has to be biological.


    Bacillus thuringiensis (or Bt) is a Gram-positive, soil-dwelling bacterium, commonly used as a biological pesticide.

    source : https://en.wikipedia.org/wiki/Bacillus_thuringiensis

    Sorry for the bad news though, it was a really tough question
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    (Original post by BubbleLover98)
    yes, i put amino acids to manufacture proteins and then the bases for dna synthesis
    Exactly what I put lol I wasn't confident in one word answers so I wrote that.
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    Muscle contractionName:  image.png
Views: 137
Size:  180.7 KB is separate to active transport, the mechanism for bringing about muscle contraction is not active transport, so I'm pretty sure muscle contraction is the answer
 
 
 
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