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Edexcel B3 unofficial markscheme 19th June 2017 Watch

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  • View Poll Results: What mark do you think you got?
    55+
    23
    8.61%
    47-54
    98
    36.70%
    39-46
    88
    32.96%
    30-38
    41
    15.36%
    22-29
    12
    4.49%
    Under 22
    5
    1.87%

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    1
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    It was 24, it explicitly stated in bold that that there were two groups with a total of 16000.
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    0
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    What did people get for the punnett square question?
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    2
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    (Original post by Olivia2442)
    What did people get for the punnett square question?
    25%
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    1
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    (Original post by Olivia2442)
    What did people get for the punnett square question?
    25%
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    1
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    I got a four digit number for the HIV calculation question
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    0
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    was the answer for 1 mark classical or operant conditioning ?
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    1
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    (Original post by caitlinn124)
    was the answer for 1 mark classical or operant conditioning ?
    Operant
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    6
    ReputationRep:
    2400
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    5
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    (Original post by Jennifercullen)
    25%
    its 50% because it was only to do with the male not male and female
    i put 25% though :/
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    What did u guys say for the cheese making one? I mentioned chymosin, it was first in calves' stomach and it's now genetically modified from yeast and it's cheap and quick to make
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    (Original post by Aaron jhooty)
    What did u guys say for the cheese making one? I mentioned chymosin, it was first in calves' stomach and it's now genetically modified from yeast and it's cheap and quick to make
    Yep, that's what I said as well - GM bacteria now produces it so it doesn't harm any animals so it's suitable for vegetarians.
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    (Original post by Schoolstudent01)
    I got 48 people

    I used the total to work out the percentage of the total and got 100 or one and 148 for the other. 148-100= 48

    Did anyone else do this?
    Yes I did
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    (Original post by Aaron jhooty)
    What did u guys say for the cheese making one? I mentioned chymosin, it was first in calves' stomach and it's now genetically modified from yeast and it's cheap and quick to make
    Chymosin makes it into curds and then the curds are pressed together to form cheese
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    5
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    (Original post by jamesdby)
    It was 24, it explicitly stated in bold that that there were two groups with a total of 16000.
    I split 1600 into two groups (800) and multiplied both by the different percentage separately and worked out the difference and I got 48
    sooo i dont get why it's 24 :/
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    What about the last six marker? I mentioned sodium algninate solution with calcium chloride solution to form calcium Alginate with immobilised enzymes in there. I also said immobilised enzymes are enzymes trapped in or on an inert material. For the actual process I talked about how lactase is immobilised and converts lactose into galactose and fructose, and this makes sure those who don't naturally produce the enzyme lactase don't become unwell when drinking the lactose free milk
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    The first question was species 2 because their tail thing was 25mm so it exactly could fit and reach into the plant to get the nectar wasn't it?
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    The co-evolution one was:
    .natural selection of the 2 species where they evolved to have favourable characteristics to survive
    .mutations occurred
    .they became reliant upon one another
    .you could've also mentioned how it's a specific unique relationship between the 2 species
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    (Original post by Aaron jhooty)
    What about the last six marker? I mentioned sodium algninate solution with calcium chloride solution to form calcium Alginate with immobilised enzymes in there. I also said immobilised enzymes are enzymes trapped in or on an inert material. For the actual process I talked about how lactase is immobilised and converts lactose into galactose and fructose, and this makes sure those who don't naturally produce the enzyme lactase don't become unwell when drinking the lactose free milk
    Its galactose and glucose not galactose and fructose
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    2
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    How much do you guys think it will be for an a*?
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    (Original post by Aaron jhooty)
    How much do you guys think it will be for an a*?
    Probably about 50 give or take
 
 
 
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