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OCR Biology F212 Revision [3rd June 2013] (Now Closed) Watch

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    So basically, the paper appeared to be relatively good but ocr mark schemes are so picky think most of my marks will be lost for incorrect wording. *sigh*

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    should be fine
    (Original post by Liamnut)
    I didn't out 35% glycine, I just put 35% of the molecule is made of the same amino acid.
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    If you put 5 answers for a 3 mark question.3 are right,2 are wrong and you don't contradict yourself at all,do you get all 3 marks?
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    (Original post by milworthy)
    What did everyone put for the question about reasons why crop yield varied? I put changing weather patterns and more/less pests
    same plus availibility of water, pH of soil, climate
    competition
    disease
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    (Original post by Sam_1996)
    Q1
    Polypeptide(1)
    H2NCHRCOOH (3)
    Collagen is flexible(1)
    Collagen:
    3 polypeptide chains,linked by covalent bonds to fibres,left handed helix,1 in 3 amino acids is glycine(6)
    Haemoglobin combine to oxygen to transport blood(1)
    Haemoglobin:
    Globular,4 polypeptide chains(3)

    Q2
    Enzymes(1)
    Similar elements,similar bonds,similar shape which is complementary to the enzyme so can for enzyme-substrate complex.(3)
    It can outcompete the -thing- so it is more likely to form an enzyme substrate complex with ethanol than with -thing-.This means that more ethanol will be broken down than -thing-(3)

    Q3
    Cells B and C(1)
    As its the bodies response to a foreign antigen(1)
    As it carries of phagocytosis on all cells.Doesnt involve lymphoctes(1)
    Pinches pathogen into vehicle via phagoctosis.This pathogenic vehicle fuses with lysosomes which secrete enzymes breaking down the pathogen.Then the substances can be absorbed by the phagocyte via diffusion(7)

    Genus name(1)
    Order(1)
    Phylum(1)
    Animals(1)
    Eukarya(1)
    Phylogeny is study of evolutionary relationships.Allows us to see how closely relate two organism are via DNA similarities etc,so can be used to group organism based on similarities therefore helpfull in classification(3)
    Too small to see with the eye as its only 2-3 mm long.Only discovered when microscopes were around(2)


    A very rough start to an unofficial mark scheme
    If we all add to this and improve this.
    Marks next to answers represent marks avaliable and not marks gained by the answer next to it.
    BTW could you say that collagen has high tensile strength (instead of flexible)
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    (Original post by MedMed12)
    depends if it says refer to info or not
    if it ddint im sure they are acceptable as well as others
    I'm just not sure why you would even begin to think of others when you're given these. As long as you don't directly quote the question you could have used two of the three points.

    But I guess in an exam situation it's easy to miss the info so who knows.
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    3 reasons why lower income people are more at risk of TB?
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    (Original post by Sam_1996)
    If you put 5 answers for a 3 mark question.3 are right,2 are wrong and you don't contradict yourself at all,do you get all 3 marks?
    even if you contradict yourself you can get some marks if you wrote both opposing statements in a seperate line hence why always do bullet points- tip from my teacher
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    (Original post by Sam_1996)
    If you put 5 answers for a 3 mark question.3 are right,2 are wrong and you don't contradict yourself at all,do you get all 3 marks?
    Yes unless they specifically say three.

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    For the selective breeding question

    I wrote about how it follows natural selection
    Best crops with best characteristics chosen and bred together until Hugh yielding crop.
    Resistance to diseases due mutation and genetic variation
    Crops with the resistance can on,y survive and reproduce
    Offspring are advantageous
    Alleles which cause this resistance passed over many generation
    Evolution occurs (long term) so crops with the resistance becomes more common I the population
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    (Original post by mastermdc)
    BTW could you say that collagen has high tensile strength (instead of flexible)
    Yes you can
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    (Original post by Minz)
    So, what about the 7 marker on selective breeding to get disease resistant crops and then precautions of selective breeding.

    What did people write about precautions and how to reduce implications of selective breeding?
    Seed banks, botanical gardens? Or do you think they were looking for something else?

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    Looking at it what you've said makes much more sense :/ but I said that they should selectively breed plants from different areas/ try and prevent inbreeding ie. the wild south american potatoes with the Irish ones to increase genetic diversity and ultimately broaden the gene pool so there was a greater chance of a genetic mutation of disease resistance occurring :/ it made sense at the time
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    (Original post by Sam_1996)
    Q1
    Polypeptide(1)
    H2NCHRCOOH (3)
    Collagen is flexible(1)
    Collagen:
    3 polypeptide chains,linked by covalent bonds to fibres,left handed helix,1 in 3 amino acids is glycine(6)
    Haemoglobin combine to oxygen to transport blood(1)
    Haemoglobin:
    Globular,4 polypeptide chains(3)

    Q2
    Enzymes(1)
    Similar elements,similar bonds,similar shape which is complementary to the enzyme so can for enzyme-substrate complex.(3)
    It can outcompete the -thing- so it is more likely to form an enzyme substrate complex with ethanol than with -thing-.This means that more ethanol will be broken down than -thing-(3)

    Q3
    Cells B and C(1)
    As its the bodies response to a foreign antigen(1)
    As it carries of phagocytosis on all cells.Doesnt involve lymphoctes(1)
    Pinches pathogen into vehicle via phagoctosis.This pathogenic vehicle fuses with lysosomes which secrete enzymes breaking down the pathogen.Then the substances can be absorbed by the phagocyte via diffusion(7)

    Genus name(1)
    Order(1)
    Phylum(1)
    Animals(1)
    Eukarya(1)
    Phylogeny is study of evolutionary relationships.Allows us to see how closely relate two organism are via DNA similarities etc,so can be used to group organism based on similarities therefore helpfull in classification(3)
    Too small to see with the eye as its only 2-3 mm long.Only discovered when microscopes were around(2)


    A very rough start to an unofficial mark scheme
    If we all add to this and improve this.
    Marks next to answers represent marks avaliable and not marks gained by the answer next to it.
    Why is it cell b and c and not just cell c ?


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    (Original post by RoseBrilliante)
    I don't know :/ I don't know because I'm not too sure how specific OCR are with their mark schemes. Even if you didn't, I wouldn't worry about it because it's only one mark
    Marks are for Eukarote, Eukarya, or Eukaryotae
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    What did people put for the very first question about the sequence of amino acids?
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    (Original post by sh7171)
    What did people put for the very first question about the sequence of amino acids?
    primary structure
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    (Original post by sh7171)
    What did people put for the very first question about the sequence of amino acids?
    Primary structure


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    (Original post by Munrot07)
    primary structure
    Could you put polypeptide?
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    What was the answer for the question underneath the hydrogen bond dna structure where you had to fill in the gaps? I put ribosome and polypeptide...

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    (Original post by Sam_1996)
    Could you put polypeptide?
    no :/
 
 
 
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