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AQA Biology B2 - Unofficial Mark Scheme watch

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    For the catalyst question would since they only need lower temp - more money efficient count?
    and disadvantage as allergies?
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    lol did people see that odd last question where there was only one marker on the page? I almost missed it XD
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    (Original post by Elizabesu)
    For the catalyst question would since they only need lower temp - more money efficient count?
    and disadvantage as allergies?
    Nope as it said that the enzyme was removed. It said that hydrogen peroxide method doesn't kill all bacteria
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    (Original post by spoony2799)
    1)Total number of plantains=202)Total area of 10 quadrats (in m^2)=6250
    3)Mean number of plantains per m^2= 20/10=2
    4)Total area of the field=5000
    5)Estimated number of plantains in field=10,000
    This was I got
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    For the what is an enzyme question I was pretty sure these were the marks: it is a protein (1st mark) made of chains of amino acids (2nd mark)...
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    (Original post by Elizabesu)
    For the catalyst question would since they only need lower temp - more money efficient count?
    and disadvantage as allergies?
    Yes I think so, , for a disadvantage I said enzymes are expensive to buy
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    Lol I got 1min for how long he was running cause it levelled off...
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    (Original post by babymarima)
    didn't it ask for the area of all the quadrats (10)? so you'd do 25x25x10 then divide by 100 to get metres
    You Do 0.25x0.25 * 10
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    For the improvements, I put:

    Do more samples
    Randomly place down quadrats
    Increase the area of each quadrat to increase the amount of plantain you count and to give more data thus (more reproducible)
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    (Original post by mellowjoker)
    What did everyone get for the genotype, phenotype and gametes question for the mother, father and then children? I couldn't remember what a phenotype was and so I'm pretty sure I completely messed up that page
    I put as the phenotype Bb and Bb and then the Genotype I put heterozygous and gametes I put XY and XX - I'm certain I've got this entire page wrong as it was something I only briefly revised and now wish I had spent more time on!

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    Yeah I for phenotype as Brown hair and Brown hair for the mother and father, Genotype as Bb and Bb, and the gametes as XY and XXI wasn't confident on that page though haha
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    (Original post by JAOASHAIL)
    You're getting A, not A*. The no. of plantains was 160000
    You forgot to divide by 100 as they asked for the area in metres and they gave it to us in centimetres. So the answer was 1600.
    Unlucky :/
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    So did I!!
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    Minimum: 54/60
    Maximum: 57/60
    Realistic: 56/60

    .... according to unofficial mark scheme and other suggestions

    What does everyone think they got?
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    (Original post by RevisionGuide)
    For the 6 marker, didn't you only have to write about the use of the equipment given in the question, and not using any other equipment such as a stopwatch or test tubes like you mentioned
    Yeah you only had to write about the equipment used on the picture
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    (Original post by jazz_xox_)
    This was I got
    For the last one it was 100,000 not 10,000
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    (Original post by ozziess)
    Yeah I got 1600, remembered it wrong . 20 was the total flies and 62.5 was the total area, so to get the flies per metre you had to divide it by 62.5. I'm 100% sure the unofficial mark scheme is wrong.
    It's 160000. You divide 20 by (0.25*0.25) 0.0625m2. Then times by 10. 0.625.
    20/0.625 is 32.
    32 times 5000 is 160000. Simple.
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    (Original post by Redcoats)
    Minimum: 54/60
    Maximum: 57/60
    Realistic: 56/60

    .... according to unofficial mark scheme and other suggestions

    What does everyone think they got?
    same as you though my maximum is still 59, what did you get for plantanis question?
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    (Original post by Townart)
    It's 160000. You divide 20 by (0.25*0.25) 0.0625m2. Then times by 10. 0.625.
    20/0.625 is 32.
    32 times 5000 is 160000. Simple.
    i put that, people keep telling me im wrong.
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    Why can't I add images!?
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    (Original post by Blahblahblah7)
    The advantage of catalase was that it doesn't require fossil fuels to heat milk to 138

    Disadvantage it said above question that H2O2 (hydrogen peroxide) doesn't kill all bacteria but heating will.
    thats what i wrote
 
 
 
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