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Upcoming Edexcel AS Biology: Unit 2 exam on 26 May 2011 Watch

  • View Poll Results: Difficulty level of Edexcel's Biology Unit 2 exam?
    VERY EASY, a joke quite frankly.
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    EASY, nicest paper written.
    5
    20.83%
    FAIR, a few odd questions but overall good.
    11
    45.83%
    CHALLENGING, tougher than expected but manageable.
    7
    29.17%
    VERY HARD, disgusting paper.
    1
    4.17%

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    Yeh just realized I made some stupid mistakes.I believe the endemic species was in D as endmism means unique to a location. I also put stem cells :'(
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    (Original post by Great)
    hey guys how many marks was the labelling the haplod thing again??? i put the specie for endemism for A?? i was not sure?? but did you put for the gihest c?? and lowest D i dont remember?
    haploid question was 2 marks
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    (Original post by harcoreage)
    Just a few answers that I can actually remember putting...
    A and C for the highest species richeness and lowest respectively.
    The prokaryotic cell showed a flagellum and I put the outer dashed area as a capsule however some people have told me it could have been a cell wall.
    I then labelled the ribosomes and circular DNA inside the cytoplasm for the other 2 marks.

    There was also an adaptations question I seem to recall which I believe EVERYONE taking the exam should have got, it was behavioural therefore I think it was the one where they lie down in the heat of the sun (can't remember great detail).

    I put 23,000 genes as none of them had differentiated and totipotenty is unspecialised and undifferentiated. (I'm probably wrong here).

    With the allele question where it required shading I simple just swapped the point at where they cross over onto the other one. So on the new diagram I just didnt shade the little tip on the right and shaded the left top top on the right one. If that makes sense.

    There was a lot of data questions and one of the stem cell questions through me completely :/.

    Overall it was okay, could have been better, hopefully the grade boundaries are low and that I got a C .
    The first thing in bold - you are absolutely right, it is a capsule, the cell wall was already labelled I think, but nevertheless it was capsule, see the annotations here on this link.

    The second thing in bold, again, you're right!
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    put the specie for endemism for A?? i was not sure?? but did you put for the gihest c?? and lowest D i dont remember?
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    (Original post by snow leopard)
    The first thing in bold - you are absolutely right, it is a capsule, the cell wall was already labelled I think, but nevertheless it was capsule, see the annotations here on this link.

    The second thing in bold, again, you're right!
    Cheers for the reassurance buddy
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    (Original post by snow leopard)
    I'll be honest in that it was very easy in comparison to previous years, especially the lack of irrelevant and complex graphs - we got a bar chart with the mineral ions were we just had to look for the highest mass (B had highest mag and calcium right?) and throughout were very simple statistics.

    Grade boundaries usually always 60 for A, so just remember that you can lose 20 and still get A
    Yep I put B for both I think. Reasons:
    - calcium is needed to make calcium pectate, which is found at the middle lamella to hold neighbouring cells together - therefore it would strengthen the plant?
    - said B for magnesium but can't remember what I said for it

    Thanks for being so reassuring haha, I don't know, A2 apparently gets like 20 times harder, so I just want as best as I can get in AS, if I get so much as a low A I might consider re-taking... which seems very likely!
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    (Original post by harcoreage)
    Yeh just realized I made some stupid mistakes.I believe the endemic species was in D as endmism means unique to a location. I also put stem cells :'(
    I made the WORST stupid mistakes. I drew and lebelled ribosomes in the prokaryotic cell, then crossed it out and put lysosomes instead. Shoot me now.
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    (Original post by britchick)
    Yep I put B for both I think. Reasons:
    - calcium is needed to make calcium pectate, which is found at the middle lamella to hold neighbouring cells together - therefore it would strengthen the plant?
    - said B for magnesium but can't remember what I said for it

    Thanks for being so reassuring haha, I don't know, A2 apparently gets like 20 times harder, so I just want as best as I can get in AS, if I get so much as a low A I might consider re-taking... which seems very likely!
    magnesium is a component in chlorophyll i think
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    (Original post by Alakamind)
    For the bacteria questions, the awnser was evenly spread the bacteria all over the petri dish to create accurate results whilst using gloves.
    OMG i had no idea what to write there but I put exactly what you said hahahaha so lucky !
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    did you guys put specie A for endomesim ?????
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    (Original post by Great)
    did you guys put specie A for endomesim ?????
    Put D because the flag shape was only present in area D only
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    (Original post by britchick)
    Yep I put B for both I think. Reasons:
    - calcium is needed to make calcium pectate, which is found at the middle lamella to hold neighbouring cells together - therefore it would strengthen the plant?
    - said B for magnesium but can't remember what I said for it

    Thanks for being so reassuring haha, I don't know, A2 apparently gets like 20 times harder, so I just want as best as I can get in AS, if I get so much as a low A I might consider re-taking... which seems very likely!
    I said caclium pectate is a component of the cell wall (which include the middle lamela in its structure) so it's involved in cell strength (as well cell wall permeability). However, I think I was supposed to reference the middle lamela, you may have beat me to this mark :P

    Magnesium is needed to make chlorophyll.

    I would have thought A2 is the same, its biology, just memorizing textbooks??...
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    (Original post by britchick)
    I made the WORST stupid mistakes. I drew and lebelled ribosomes in the prokaryotic cell, then crossed it out and put lysosomes instead. Shoot me now.
    I don't get why people were drawing ribosomes and eukaryotic organelles! It's more concrete to put the loop of DNA and plasmids that are exclusively found in the prokaryotes...
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    for the question about give one evidence for the bacteria where they gave us a chart did you put ethanol extract had least amount of bacterium something like that can remeber correctly?? and where it said why is it sealed i put so that other bacterias dont enter the petri dish to harm or effect the experiment?
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    what did people write for describing how a cell looks in telophase? i knew what happens during telophase but didnt know how to describe what it looks like...
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    (Original post by snow leopard)
    I said caclium pectate is a component of the cell wall (which include the middle lamela in its structure) so it's involved in cell strength (as well cell wall permeability). However, I think I was supposed to reference the middle lamela, you may have beat me to this mark :P

    Magnesium is needed to make chlorophyll.

    I would have thought A2 is the same, its biology, just memorizing textbooks??...
    Yeah I think I said how magnesium is used to make chlorophyll, since it's kinda what the question insinuated

    I don't know, I've heard from teachers and some year 13s in my form that, for example, the jump from GCSE-AS in physics seems huge, but from AS-A2 you've sorta got the "physics brain", but for biology next year the concepts step up a notch and bleurgh.
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    can my idea be correct as well ?? do you think because if is open then maybe other harmful bacterias can enter and damage bacterias which are already inside??? what did you put for the question about fertilised egg thing ?? i put take nucleus from patients body and fuse with egg cell and i mentioned bone marrow??
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    I drew circular DNA and a 'small' ribosome. For the nitrate, calcium graph question I put B for both?
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    (Original post by insertcoinhere)
    so what is the answeer then? 23000 or 11000?
    im confused again :s now im thinkin it cant be 11000 because it means 11000 genes r turned on so it is differentiated it should be 23000 :/
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    Oh and for the 11,000 23,000 debate. This is from the revision guide: 'Stem cells all contain the same genes, but not all of them are expressed (switched on) because not all of them are active'
    So not all of them are switched on. I think it's 11,000.
 
 
 
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