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Edexcel B3 unofficial markscheme 19th June 2017 Watch

  • View Poll Results: What mark do you think you got?
    55+
    23
    8.68%
    47-54
    97
    36.60%
    39-46
    88
    33.21%
    30-38
    40
    15.09%
    22-29
    12
    4.53%
    Under 22
    5
    1.89%

    • Thread Starter
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    Predictions for grade boundaries ?
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    (Original post by Oliver4214)
    Predictions for grade boundaries ?
    IM hoping they are quite low because I think this paper was harder than those of previous years, hopefully an a* is around 49 or 50
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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?
    I got this!
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    (Original post by Jadeelmazi)
    I got this!

    Bad luck m8 u got it wrong, enjoy your BTEC
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    What did people put for the first six marker?

    - I discussed about primary and secondary immune response and lymphocytes?
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    What did people write for the transgenic plant question?
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    (Original post by Oliver4214)
    Less predators will soot the eggs and so it is less likely to be eaten thus increasing its chance of survival
    I also talked about that the caterpillar would be able to eat from the leaf as soon as it hatches, which compensates for the lack of parental care. Would that be okay?
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    (Original post by Jadeelmazi)
    What did people put for the first six marker?

    - I discussed about primary and secondary immune response and lymphocytes?
    Yeah that's right, the primary response bit was mentioning first infection of pathogen in body, and an immune response is formed as lymphocytes divide and antibodies bind to the antigen and destroy the pathogen, then memory lymphocytes are in the blood.
    A rapid secondary response is triggered with 2nd infection due to the memory lymphocytes which produce a rapid response of lots of antibodies to destroy the pathogen, most likely before symptoms can be felt. I don't think there was anything else to say to get 6/6?
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    (Original post by Jadeelmazi)
    What did people put for the first six marker?

    - I discussed about primary and secondary immune response and lymphocytes?
    Yup, I first compared the two parts of the graph (primary and secondary response), and then explained ot with the roles of B lymphocytes and memory lymphocytes
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    (Original post by RHIgnis)
    I also talked about that the caterpillar would be able to eat from the leaf as soon as it hatches, which compensates for the lack of parental care. Would that be okay?
    Yes I mentioned this point and the idea of protection from predators so therefore the parents genes carry on through their offspring so the species is continued.
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    (Original post by Jadeelmazi)
    What did people write for the transgenic plant question?
    Restriction enzyme
    Ligases enzyme
    Sticky ends
    Vector
    Infection of plant
    Incorporation of DNA into plant
    I also mentioned crown galls
    What did u mention?
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    (Original post by Aaron jhooty)
    Restriction enzyme
    Ligases enzyme
    Sticky ends
    Vector
    Infection of plant
    Incorporation of DNA into plant
    I also mentioned crown galls
    What did u mention?
    Yep i wrote pretty much the same as that
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    For the last 6 mark question, I wrote about:
    -lactase
    - alginate solution
    - problems with lactose
    But i said the reaction is lactose -> lactic acid like it is in youghut
    How many marks would i get?
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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?
    yeah i got 48 too
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    (Original post by Aaron jhooty)
    Restriction enzyme
    Ligases enzyme
    Sticky ends
    Vector
    Infection of plant
    Incorporation of DNA into plant
    I also mentioned crown galls
    What did u mention?
    Pretty much exactly what I wrote x
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    (Original post by idyrkyskskys)
    You still have the possibility of having a girl, the question asked for a boy with the disease, as a result it is out of all possibilities which is 25%. You can't assume it will be a boy. You can check past papers, you never calculate chances out of two possibilities when there are 4 unless stated, which it didn't.
    I wrote that there's a 25% of a child with the disease and 50% chance of a boy with the disease. I put both.
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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
    i thought lactase makes lactose into glucose and galactose?
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    (Original post by Inspire_pizza)
    i thought lactase makes lactose into glucose and galactose?
    Yeah It does I messed up on that q but hopefully I'll only lose a mark for that
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    (Original post by 2772)
    For the last 6 mark question, I wrote about:
    -lactase
    - alginate solution
    - problems with lactose
    But i said the reaction is lactose -> lactic acid like it is in youghut
    How many marks would i get?
    Well if u went into detail with ur other points u should get atleast 4 marks, i doubt it's made that much of a difference
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    what do you guys predict the grade boundary to be?
 
 
 
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