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

  • View Poll Results: How did you feel the F212 exam went?
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    Exam was fair but back me and say if you didn't revise you we're screwed.one question - I put collagen had a triple helix and haemoglobin has a double helix - I've contradicted myself haven't I ?


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    (Original post by Onkar-M)
    I rounded it up to 0.64.
    Woops.
    You might still get the mark, as it is correctly rounded
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    Was the kingdom animale or protoctist for the water bear and why?
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    (Original post by Student296)
    I messed up the phagocytosis question and wrote about lymphocytes. How many marks will i get out of 7 for this?

    Pathogen engulfed by macrophage cells from the immune system
    Removal of antigens from pathogens
    Antigens presented on surface of engulfing cells
    They then find the lymphocytes that can neutralise the particular antigen
    Selection of correct T killer cells and T helper cells
    Reproduction of T killer cells
    T killer cells search for infected cells
    T killer cells attach to infected cells
    T killer cells secrete toxic substances (hydrogen peroxide) into
    infected cells to kill the cell and the pathogens it contains
    I've put down exactly the same thing that you've written down! honestly i don't know whether we'll be able to get the marks
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    (Original post by Student296)
    I messed up the phagocytosis question and wrote about lymphocytes. How many marks will i get out of 7 for this?

    Pathogen engulfed by macrophage cells from the immune system
    Removal of antigens from pathogens
    Antigens presented on surface of engulfing cells
    They then find the lymphocytes that can neutralise the particular antigen
    Selection of correct T killer cells and T helper cells
    Reproduction of T killer cells
    T killer cells search for infected cells
    T killer cells attach to infected cells
    T killer cells secrete toxic substances (hydrogen peroxide) into
    infected cells to kill the cell and the pathogens it contains
    Most likely 0 marks, maybe one if you're lucky
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    (Original post by krishkmistry)
    Exam was fair but back me and say if you didn't revise you we're screwed.one question - I put collagen had a triple helix and haemoglobin has a double helix - I've contradicted myself haven't I ?


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    Haemoglobin has some alpha helix structures, but it is globular so it's not actually said to have a helical structure.
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    (Original post by otrivine)
    Good more

    good practise for me lol
    aww
    what UMS did you get on F212?
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    What did everyone write for the centrifuge question?
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    i drew out the amino acid thing. owp. I also put for the Haemoglobin and Collagen differences.

    Collagen is mainly consisted of 35% glyceine. Haemoglobin is consisted of many various amino acids.
    Collagen is left hand helix whereas haemoglobin is alpha helix.
    haemoglobin contains four tertiary subunits. collagen contains three tertiary subunits.
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    (Original post by bambi77122)
    I've put down exactly the same thing that you've written down! honestly i don't know whether we'll be able to get the marks
    of course you will,
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    1a) Primary structure/polypeptide chain

    b) nh2CHRCOOH

    ci) it is strong

    Cii)

    Collagen is fibrous protein, secondary structure (explanation of hydrogen bonds, coiling, alpha helix, folding, beta sheet), teitary structure (3D shape, futher coiling and folding, ionic bonds, dusulphude bond/bridge, hydrophobic and hydrophilic interactions), quaternary is final shape. Collagen consists of 3 long polypeptide chains

    Di) binds with O2 due to affinity to form oxyhemoglobin to transport O2 in red blood cells

    Ii) haemoglobin differences:
    4 polypeptide chains
    Soluble in water
    Globular protein


    These are answers for first Question I think
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    (Original post by MedMed12)
    aww
    what UMS did you get on F212?
    I got 129UMS , you should have done the Jan 2013 paper, it was a pleasure and less biodiversity, we have a 9 marker question on how to preserve food, very nice
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    (Original post by sylly)
    You might still get the mark, as it is correctly rounded
    Hope so
    Would be silly not to!
    Exams make me do funny things lol!
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    (Original post by Loiks94)
    Was the kingdom animale or protoctist for the water bear and why?
    animal because it was multicellular, could move and was eukaryotic
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    For the people asking about the mycobacterium question I think mycobacterium is the answer, mycobacterium tuberculosis is a specific strain of the infective agent
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    Anyone put high tensile strength for the property of collagen ?


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    (Original post by otrivine)
    I got 129UMS , you should have done the Jan 2013 paper, it was a pleasure and less biodiversity, we have a 9 marker question on how to preserve food, very nice
    well done you!!
    yeah it was a nice paper I got 80/100 on that as a mock and A was 71
    just so annoyed at my silly mistakes as its easy UMS to save on A2 papers :/ I did well in f215 mock so hopefully the real thing I might/could be OK with.
    Was initially aiming for full UMS on this paper :P such a fail aha!
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    (Original post by niceguy95)
    1a) Primary structure/polypeptide chain

    b) nh2CHRCOOH

    ci) it is strong

    Cii)

    Collagen is fibrous protein, secondary structure (explanation of hydrogen bonds, coiling, alpha helix, folding, beta sheet), teitary structure (3D shape, futher coiling and folding, ionic bonds, dusulphude bond/bridge, hydrophobic and hydrophilic interactions), quaternary is final shape. Collagen consists of 3 long polypeptide chains

    Di) binds with O2 due to affinity to form oxyhemoglobin to transport O2 in red blood cells

    Ii) haemoglobin differences:
    4 polypeptide chains
    Soluble in water
    Globular protein


    These are answers for first Question I think
    For the amino acid question instead of writing out the formula I drew an amino acid and labelled it :/
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    (Original post by MrMeep2580)
    animal because it was multicellular, could move and was eukaryotic
    Clever question that,got to give it to OCR


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    (Original post by krishkmistry)
    Anyone put high tensile strength for the property of collagen ?


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    could be that too
    or insoluble
 
 
 
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