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

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    (Original post by lucindaellaaa)
    Yeah, thats exactly what I did I explained the bonds too, you get marks for the bonds (I like studied the haemoglobic question for my first exam ahha).
    Then it said say three things different from Haemoglobin and Collagen;
    I put Haemoglobin is globular, but collagen is Fibrous.
    Haemoglobin has 4 sub units, Collagen has 3.
    Haemoglobin consists of 2 alpha and 2 beta, but Collagen has just 3 alphas.
    They used the prosthetic group as the example, I was like WHAT R U DOING.:mad:
    I litteraly wrote the same thing

    Good times
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    (Original post by krishkmistry)
    Anyone put that tb is transmitted by contaminated beef ? I've deffo seen this in a lot of papers previous to this one


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    I thought TB was badgers .. but i think it's transmitted by droplets mostly but, it can be caught by eating meat too
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    (Original post by student_1995)
    Technically you're meant to underline or italicise latin names, but OCR don't seem to mind this. I couldn't remember the first bit so I just but M. Bovis (which the text book says.)
    It will need Mycobacterium and either bovis or tuberculosis :/
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    (Original post by niceguy95)
    Because when writing the name according to binomial system you underline if it's handwritten
    (Original post by student_1995)
    Technically you're meant to underline or italicise latin names, but OCR don't seem to mind this. I couldn't remember the first bit so I just but M. Bovis (which the text book says.)
    Oh right okay, I understand now, I don't think they would be that specific as long as you written the right answer
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    (Original post by YaprakDokumu)
    For the question about the pathogen, didn't you have to talk about lymphocytes because they also help destroy the pathogen (killer T cells). I wrote nothing about the process of phagocytosis, but wrote about antigen presenting and clonal expansion and differentiation and what they all do and so on........ please anyone??
    The question wanted phagocytosis as it said after the bacterial pathogen has bound to the receptor on a phagocyte :/
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    (Original post by kited4)
    uhhh i put primary structure for the first questions xD is that wrong?
    so did I! My teacher said it's primary structure
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    (Original post by lucindaellaaa)
    I thought TB was badgers .. but i think it's transmitted by droplets mostly but, it can be caught by eating meat too
    Haha well I've just checked it and they accepted it so il be fine


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    For the 6 marker on collagen,

    did they want you to describe primary, secondary, tertiary and quaternary structures?

    As well as some specifics (every 3rd is glycine) ?
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    (Original post by Munrot07)
    The question wanted phagocytosis as it said after the bacterial pathogen has bound to the receptor on a phagocyte :/

    I know but when it does that it is digested and the antigens are presented on the phagocyte's surface... the other pathogens in the body are destroyed by killer Ts as well aren't they??
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    Guys, I wrote for the selective breeding that two plants with high disease resistance were taken and bred assexually, to produce a offspring that also had high yield, then I said about removing the plants without disease resistance and how you could test this, then I said about inbreeding the plants etc... I also said it takes a long time over many generations but eventually the allele for disease resistance would become more common


    How many marks would I receive for this? Thanks
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    (Original post by Blashnet)
    For the 6 marker on collagen,

    did they want you to describe primary, secondary, tertiary and quaternary structures?

    As well as some specifics (every 3rd is glycine) ?
    Yeah, you can easily get 6 marks if you didn't include specifics you'll get a mark for something silly like 'hydrogen bonds form during the secondary structure' so, definitely
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    (Original post by YaprakDokumu)
    I know but when it does that it is digested and the antigens are presented on the phagocyte's surface... the other pathogens in the body are destroyed by killer Ts as well aren't they??
    Since the bacterial pathogen has already been digested and destroyed, only the antigens remain
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    Also, is high tensile strength a correct feature for collagen?
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    (Original post by ellie2996)
    Guys, I wrote for the selective breeding that two plants with high disease resistance were taken and bred assexually, to produce a offspring that also had high yield, then I said about removing the plants without disease resistance and how you could test this, then I said about inbreeding the plants etc... I also said it takes a long time over many generations but eventually the allele for disease resistance would become more common


    How many marks would I receive for this? Thanks
    You should get most of the marks for that. They did also ask for a bit about how to increase the genetic diversity I think, so they would've wanted 'geographically separated' etc. But yeah, you should get most marks for that as it was mainly asking for an explanation of selective breeding.
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    (Original post by Munrot07)
    Since the bacterial pathogen has already been digested and destroyed, only the antigens remain

    what about other invaded cells?
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    (Original post by lucindaellaaa)
    Yeah, you can easily get 6 marks if you didn't include specifics you'll get a mark for something silly like 'hydrogen bonds form during the secondary structure' so, definitely
    yay
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    (Original post by YaprakDokumu)
    For the question about the pathogen, didn't you have to talk about lymphocytes because they also help destroy the pathogen (killer T cells). I wrote nothing about the process of phagocytosis, but wrote about antigen presenting and clonal expansion and differentiation and what they all do and so on........ please anyone??
    The differentiation of T-killer cells and lymphocytes does destroy pathogens and does happen after the pathogen has bound to the phagocyte. I can't remember the exact question, but I included phagocytosis and lymphocytes etc. I hope both are creditworthy!!
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    (Original post by MarkProbio)
    Completely agree.
    I also don't see why they would put the length of the water bear and NOT the length of the phagocyte, unless it was relevant in some way.
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    (Original post by krishkmistry)
    However did you put all your figures to the decimal places on the stated figures - that's a mark I think


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    NOOO!

    How many decimal places was it?
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    (Original post by YaprakDokumu)
    what about other invaded cells?
    This question does seem to have everyone confused, i read it as just the individual bacterial pathogen that was bound to the phagocyte :/
 
 
 
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