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OCR F211/F212 AS Biology Retake 2016 Watch

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    (Original post by ToLiveInADream)
    Yeah it was, i think you would say staining provides contrast to distinguish between cell contents eg. supercoiled chromosomes visible under light microscope.

    And the stem cell question is ''divide into different types of cells/mitosis'' I think, either may get the mark
    Wasn't it implied in question that besides differentiation? Our teachers couldn't work it out haha
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    Hi guys, what do think the grade boundries will be like this year? And any predictions for f212?

    Thanks
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    (Original post by WillMac53)
    I put that aswell. Seemed like the most reasonable idea. Flat line at the bottom seems weird to have such a thin right ventricle
    They were making the difference in the thickness of the ventricle walls clear.
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    RE stem cell question. I'm sure normal cells undergo mitosis? I wrote that stem cells have no function. Also, stem calls can rapidly divided.
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    i got FADE, muscles constrict the airways, I know muscular due to high pressure makes sense but the muscles are more to do with constriction. Collagen is more for resistance to high pressure
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    (Original post by badhand45)
    Hey guys, in regard to the one about water movement everyone put exocytosis but I put osmosis as it is still removal of water, so I checked about the contractile vacuole properties I came across this which states mitosis. do you think they will accept osmosis and exocytosis or be OCR picky? thanks
    Contractile Vacuole:
    "The contractile vacuole is basically a water bubble within the endoplasm of A. proteus. It’s function is to regulate the water content of the cell. It is also a means of excreeting its waste from the cell (out through the cell membrane) VIA diffusion. A. proteus regularly moves to the surface of the water, when it needs to discharge wastes and excess water. This is done via osmosis, where there is a semi permeable membrane that lets the flow of materials through the cell. Without the contractile vacuole, the amoeba may burst. Undoubtedly it is a very important organelle with an essential function to the amoeba."

    Ooo...that's a good question...if it's scientifically sound then OCR may have to award the mark or if the majority of students write osmosis for example due to reading their wording differently...but they may have wanted you to read further into inbetween what they said and put exocytosis....but you could possibly have "pinoexocytosis" too!

    It's a tricky one because like you say, the process of osmosis is occurring... I just saw "fuses with membrane" and thought oh, maybe I should put exocytosis instead, if it's trying to trick me.

    Hopefully the biology gods looking down will accept: exocytosis, osmosis or pinoexocytosis


    *goes to a quiet corner and prays*
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    Hey guys, Does anyone remember all the options given for the question to do with matching the hearts components with their main functions?
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    Feeling less confident now ive read through this, definitely messed up on the question about moss.

    Are we reckoning the grade boundaries will be lower than last years or about the same?
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    For the stem cell question, I wrote that stem cells can become specialised so that they can control their Organelle composition and composition of their membranes.

    for the water moving out of cell one, I wrote pinoexocytosis instead of exopinocytosis will they still give me the mark for it??
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    Am I the only who wrote 'stems are able to differentiate and that they are totipotent' ?


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    (Original post by Hsn_)
    Am I the only who wrote 'stems are able to differentiate and that they are totipotent' ?


    Posted from TSR Mobile
    Wasn't that in question "stem cells are able to specialise into other cells"
    Isn't differentiation and specialisation the same thing?
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    What do you guys think will be the grade boundaries?

    I had such high hopes but I think I flopped on the last 4marker and lost some silly marks here and there. I need to get an A or no med school for me D;
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    Grade boundaries have never been higher than 45/60 for an A, I think this year will be 44/45 for an A as overall the paper wasn't difficult
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    (Original post by LB9213)
    Hey guys, Does anyone remember all the options given for the question to do with matching the hearts components with their main functions?
    Can't quite remember, but it was something like this, in no particular order:

    Option C (given in question)

    - both the atria pump blood into the ventricles

    - the smooth muscle contracts

    - the pressure in the blood is high

    - the pressure in the blood fluctuates

    - the heart has a double circulatory system

    - one more option ??

    ----------------------------------------------------------------------------------------------------
    - left ventricle wall thicker than right ventricle wall (given in question)

    - the atrial walls are thinner than the ventricles

    - the arterial walls have smooth muscle

    - small arteries have elastic tissue

    - the septum separates the ventricle
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    (Original post by GLL1998)
    Grade boundaries have never been higher than 45/60 for an A, I think this year will be 44/45 for an A as overall the paper wasn't difficult
    That's alright then. I thought the grade boundaries may be higher this year since its only retakers taking it.

    Cheers.
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    (Original post by DeclanKeeble)
    Can't quite remember, but it was something like this, in no particular order:

    Option C (given in question)

    - both the atria pump blood into the ventricles

    - the smooth muscle contracts

    - the pressure in the blood is high

    - the pressure in the blood fluctuates

    - the heart has a double circulatory system

    - one more option ??

    ----------------------------------------------------------------------------------------------------
    - left ventricle wall thicker than right ventricle wall (given in question)

    - the atrial walls are thinner than the ventricles

    - the arterial walls have smooth muscle

    - small arteries have elastic tissue

    - the septum separates the ventricle



    Which ones go with which ?


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    (Original post by Anymorefor123)
    Which ones go with which ?


    Posted from TSR Mobile
    I think I messed it up, but it was something along the lines off:

    1) the atrial walls are thinner than the ventricles
    = both the atria pump blood into the ventricles

    2) the arterial walls have smooth muscle
    = the smooth muscle contracts

    3) small arteries have elastic tissue
    = the pressure in the blood is high

    I was debating between putting the above^ or "the pressure in the blood fluctuates" but it seems like most people but the latter

    4) the septum separates the ventricle
    = the heart has a double circulatory system
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    i though the kLM bit could of been the sinoatrial , atrioventricular and apex... maybe.
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    How ready is everyone for F212?? Im no where near ready LOL -.-
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    (Original post by Anymorefor123)
    Which ones go with which ?


    Posted from TSR Mobile
    Pretty sure there was also one saying;
    In arteries muscle contract to maintain high blood pressure
 
 
 
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