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

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    (Original post by MedMed12)
    i put conc of sugar thing
    volume of sugar thing
    how long it is left to spin and same speed


    others could be -temp? volume/length of DNA
    yup but said only 3 we both got it i see
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    No ;( I wrote Protoctists for the water bear!
    I was thinking either animal or protoctist, then the picture looked too buggy to be an animal haha

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    how much do you think is a C?
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    For the water bear one being discovered 300 years ago, I put that;
    Might have evolved/mutated from another species
    May have been classed as the same species as another similar organism due to that fact older classification system were base mainly on appearance.
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    7 marks or not


    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 LaughingGas)
    First microscope was invented in 1590
    Depends how powerful It is doesn't it? Good optics are relatively new
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    (Original post by student_1995)
    It was an electron microscope though, which isn't an "early form"
    Ah yes I forgot it said Electron Miscroscope.

    I said that miscroscopes weren't invented (although should maybe have specified electron miscroscopes) and also that interest in biological science wasn't as high as it is now due to religious beliefs. But that was really just scraping the barrel as I couldn't think what to put.

    (Original post by niceguy95)
    wrote all that but though it was too short and began to talk about b-cells and antibodies, would I loose marks for including the second bit
    I wouldn't have thought you'd lose marks. Like mentioned before, if it doesn't say "State X number of points" then you can write as much as you like. Only thing you might have lost is the sequencing point if it was in the wrong context.
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    (Original post by Deziah)
    For the water bear one being discovered 300 years ago, I put that;
    Might have evolved/mutated from another species
    May have been classed as the same species as another similar organism due to that fact older classification system were base mainly on appearance.
    yep That's right
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    (Original post by niceguy95)
    Lack of money means
    Poor ventilation
    Poor diet
    Overcrowding in small houses
    i said not educated well
    poor health care in low income group areas
    not enough money for wellbeing
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    (Original post by niceguy95)
    7 marks or not


    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
    Natural selection isn't the same as selective breeding?
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    (Original post by Hello...)
    For the people asking about the mycobacterium question I think mycobacterium is the answer, mycobacterium tuberculosis is a specific strain of the infective agent
    Yes I put just Mycobacterium too, so glad someone agrees cos I was getting a bit doubtful after everyone was saying specific strains.

    is underlining required too?
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    (Original post by jackitsme)
    yup but said only 3 we both got it i see
    same i just put the others incase anyone else had them and panicked as i would see those as valid too

    (Original post by Deziah)
    For the water bear one being discovered 300 years ago, I put that;
    Might have evolved/mutated from another species
    May have been classed as the same species as another similar organism due to that fact older classification system were base mainly on appearance.
    i put migration due to change in environment i.e temperature climate etc

    i also put speciation -so allopatric and sympatric barriers :/
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    Was ethanol DEG question, inhibiting?
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    is there an unofficial mark scheme yet
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    (Original post by student_1995)
    It was an electron microscope though, which isn't an "early form"
    Not being funny. I think that was a bad question if the answer has nothing to do with size. If the answer was nothing to do with length, why would they give us the length on the sheet? Just to throw us off? It was of no relevance to the rest of the questions, if anything it would make some people less inclined to place it in the correct kingdom, animal. In addition to this, the fact that it's a tiny single celled organism to me suggests it has been around for a long time. But hey, that logic could be completely wrong.
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    (Original post by smarties94)
    Yes I put just Mycobacterium too, so glad someone agrees cos I was getting a bit doubtful after everyone was saying specific strains.

    is underlining required too?
    probs not
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    **** F212
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    (Original post by lahabz2012)
    yep That's right
    It hasn't really evolved, it's one of the oldest living organisms out there!
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    (Original post by Liberty.)
    I wrote primary structure for the first question technically, that is what it was describing... or did I read the question wrong again!
    And more silly-ass mistakes:
    Spores instead of droplets
    Only underlined mycobaterium instead of tuberculosis (probably spelt that wrong in the exam aswell)
    Cystine instead of glycine

    Why must Biology have such funnily spelt/sounding words ?!
    I put cystine instead of glycine too!!!! :mad:
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    (Original post by lahabz2012)
    yep That's right
    i think microscopes is an answer
 
 
 
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