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*Post Exam Discussion* AQA A2 Biol4 25th January 2012

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  • View Poll Results: Predicted "A" grade boundary
    35-40
    3
    2.78%
    40-45
    13
    12.04%
    45-50
    35
    32.41%
    50+
    57
    52.78%

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    (Original post by Jorgeyy)
    - Final mass increased with B
    - Low SD so farmer can expect increase - reliable
    - If profit of extra final mass (selling larger pigs) outweighed the extra cost of B
    - Whether the food caused distress to pigs

    I didn't have a clue but those were my 4 points haha
    I just talked about ratios and protein content not being increased in the new food so it may not be a good idea to change it :/
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    Aw no i wasn't thinking straight and didn't even relate the last question to the lack of light.. I rambled about how ATP that is produced in photosynthesis is used to maintain the cycle to produce glucose.. Therefore respiration occurs to provide cells with a source of ATP instead.. WHAT!!! It doesn't even make sense stupid exam pressure.
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    I wrote 1/8 as it was sex linked and there is a 1/2 chance of having a male or a female.
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    (Original post by swiftylol)
    I just talked about ratios and protein content not being increased in the new food so it may not be a good idea to change it :/
    Probably legit,

    I just figured I would repeat the information in the graph as I had no idea :rolleyes:
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    (Original post by swiftylol)
    I just talked about ratios and protein content not being increased in the new food so it may not be a good idea to change it :/
    :\ Didnt write that hahah
    can you put a poll up pleaseee for grade boundaries

    Oh in that question did any one mention about standard errors overlapping? o_O
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    (Original post by TheShapeofPunk)
    I wrote 1/8 as it was sex linked and there is a 1/2 chance of having a male or a female.
    It was 25%.
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    (Original post by Waki)
    I wrote a quarter, i hope i get it :/
    1/4 is the same as 25%, so you will more than likely get the mark. i don't think any examiner can justify not giving a mark for a fraction that is exactly equal to the percentage! i gave both 25% and 1/4 just to be safe
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    What was the working everyone did for the energy % Q? I did 10/56 x100 to get 17%, but it said show your working and at the time I didn't think that was right?!
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    (Original post by EffKayy)
    :\ Didnt write that hahah
    can you put a poll up pleaseee for grade boundaries

    Oh in that question did any one mention about standard errors overlapping? o_O
    i said that because the standard errors overlap the results are not significant... but by the time i got to that question i was so stressed i probably wrote a load of nonsense!
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    (Original post by haybo)
    i said that because the standard errors overlap the results are not significant... but by the time i got to that question i was so stressed i probably wrote a load of nonsense!
    I said that!! Wooo. Then I said the results are due to chance.. etc...
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    nvm.
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    (Original post by haybo)
    i said that because the standard errors overlap the results are not significant... but by the time i got to that question i was so stressed i probably wrote a load of nonsense!
    I said that the farmer was probably right as the one he chose had an extremely small standard error whilst still having the highest mean.. So there would be a higher growth rate and more consistence between the size of the pigs, etc..

    It only overlapped with one other result anyway, didn't it? And because A and B's standard error bars levelled off at the top at the same height, it's safe to go with A because of the smaller error (though I didn't write that)..?
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    Wow! Everyone's answer for the pig question is so impressive! I just said stuff about no repeats but large sample size? 0.0

    The ATP and last question was :eek:?!!! What did everyone write for it?

    There was also that question about how would pigs eating more affect result's reliability? What did people write?
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    Where is the other thread? Also just realised that I got the whole of the generic cross diagram wrong. For some reason I put that the male had the recessive allele. How many marks was this question?
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    What did you write for 'ATP is useful I'm biological processes explain why' ?
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    (Original post by I<3Gul)
    What did you write for 'ATP is useful I'm biological processes explain why' ?
    - Atp is soluble, so can be transported easily around cells/ organism.
    - It releases energy in short bursts
    - Cant be stored so lots of mitochondria in cells with high demand, to use when its needed.
    - One step reaction, so quick release of energy.


    What did people think of the reeds question in the gravel bed, where nitrogen-containing compounds get into cells?
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    Did nobody find the pigs over 35 degrees question mildly entertaining/pointless "pigs can't survive at more than 35 degrees, why did the scientists not test above this temperature" - i kinda put 'because they're not cruel bastards' in obviously more eloquent biological speak...
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    (Original post by PumdogMillionaire)
    Did nobody find the pigs over 35 degrees question mildly entertaining/pointless &quot;pigs can't survive at more than 35 degrees, why did the scientists not test above this temperature&quot; - i kinda put 'because they're not cruel bastards' in obviously more eloquent biological speak...
    Lmaooo, I wanted to put that but wrote that the measurements level off
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    (Original post by swiftylol)
    Lmaooo, I wanted to put that but wrote that the measurements level off
    me too lol

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