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OCR F211/F212 AS Biology Retake 2016 watch

  • View Poll Results: How hard did you find F211?!
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    (Original post by astrostar29)
    Erm Haemolysis is the rupturing of Erythrocytes so no... lol
    Pretty sure you're wrong. Cell bursting in animal cells are always haemolysed
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    (Original post by Chazeyourself)
    How would it haemloyse if it doesnt have haemoglobin?
    I think you get the mark for explaining it i.e. it swells up
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    What was the size of the artery?
    Think I may have got it wrong... 117?
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    (Original post by Hdb)
    What was the size of the artery?
    Think I may have got it wrong... 117?
    thats what i got
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    anyone got the unofficial mark scheme?
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    (Original post by Hdb)
    What was the size of the artery?
    Think I may have got it wrong... 117?
    your fine i got that along with everyone else in my class
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    BTW, K/L/M: I am pretty sure they were right ventricle, purkyne tissue and cardiac muscle(or something to do with left ventricle muscle/wall).
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    (Original post by astrostar29)
    Here's my answers to a few peoples questions

    Why doesn't the Amoeba have a transport system, o said it has large surface area to volume ratio therefore diffusion alone is adequate

    Other uses of the plasma membrane of the Amoeba, i said communication with other Amoebas and cell signalling/receptor sites to detect food and nutrient availability.

    KLM - most of the people in my school got right atria, septum and wall of left ventricle
    Pretty much all of us put a line just below the atria going horizontally, not slanted, if you look at a diagram of heart it's tilted.

    With regards to the name given to water moving out of the cell I don't think exocytosis alone would cut it. I think it should exoPINOcytosis - refer to the bottom of page 25 in the ocr purple text book.
    As it's the bulk movement of water out of the cell

    With regards to the movement of water up the moss plant you can't refer to the transpiration pull , capillary action or xylem itself because it said the plant had no vascular tissues. I talked about water potential, osmosis and root pressure.

    125micrometres for the size of the artery

    For the question about having no vacuole I said the Amoeba would keep talking up water and the cell would burst ...

    C was the leaf adapted to living in the conditions they described as it had a small surface area to reduce water loss

    Other adaptations : loads for this I just said densely packed spongy mesophyll ...

    Translocation: movement of (named) assimilates up and down the plant by mass flow (probably other marking points here, eg mention of phloem, source, sink etc)

    How air movement and wind changes increases rate of transpiration.

    Air carries water vapour that has been lost from the leaves. This ensures that the Water vapour potential from the intracellular spaces to the outside of the leaf is high, which increases the rate of diffusion

    I personally thought it was difficult to differentiate between the insert showing telophase or anaphase. Although i think if you put telophase or anaphase it won't affect the marks in the 5marker later on.

    That 3 marker about what else happens other than mitosis, I put interphase consisting of the s phase, DNA replication , G1 phase biosynthesis of organelles or proteins , g2 phase growth organelles

    Sorry they're out of order but just seeing what I can remember
    Didn't you put cytokinesis as well?


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    what was the answer for the question asking what other feature does stem cells have and the specialised cell don't?
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    (Original post by Bailey2j09)
    your fine i got that along with everyone else in my class
    Cheers bro, thought it was a good paper... Last question took me a while but got it in the end I think....
    Did you get DABE for the heart question?
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    Anyone else get 15mm?
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    (Original post by Hdb)
    Cheers bro, thought it was a good paper... Last question took me a while but got it in the end I think....
    Did you get DABE for the heart question?
    I got BADE
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    (Original post by Beta14)
    what was the answer for the question asking what other feature does stem cells have and the specialised cell don't?
    i put that they have every organelle, bc in differentiated cells a lot of them dont have certain organelles, eg rbc's dont have mitochondria or a nucleus
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    (Original post by Beta14)
    what was the answer for the question asking what other feature does stem cells have and the specialised cell don't?
    Stem cells are able to specialise into many types of cells where as specialised cells can only divide into genetically identical copies of them selves.
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    (Original post by Beta14)
    what was the answer for the question asking what other feature does stem cells have and the specialised cell don't?
    I'm not sure but I siad that they are undifferentiated, not sure if that was too similar to the question though because it said they aren't specialised. Thinking about it now I guess it could have been something to do with which genes are switched on and off?
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    (Original post by claytonb)
    i put that they have every organelle, bc in differentiated cells a lot of them dont have certain organelles, eg rbc's dont have mitochondria or a nucleus
    check my reply to the guy, i think you got a bit confused there.
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    (Original post by Bailey2j09)
    I got BADE
    Oh okay no worries lol. I probably got it wrong haha.
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    (Original post by MotorboatMyGoat)
    Pretty sure you're wrong. Cell bursting in animal cells are always haemolysed
    Well if you are adamant that you are correct why ask!
    The bursting of an animals cell due to water uptake is just known as cell lysis

    Haemolysis is the rupturing of a blood cell or an Erythrocyte meaning Haemoglobin is liberated into the surround fluid.
    Hence why there is HAEM in the word

    Google it if you are unsure...
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    (Original post by A.Ka)
    check my reply to the guy, i think you got a bit confused there.
    yep probably
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    (Original post by Hdb)
    Cheers bro, thought it was a good paper... Last question took me a while but got it in the end I think....
    Did you get DABE for the heart question?
    I got DABE but alot of people on here are saying BADE
 
 
 
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