Turn on thread page Beta

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.
    0
    0%
    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%

    Offline

    0
    ReputationRep:
    I also but C and B. >.<

    For the Zoo question, I just rambled. I did not know enough for five marks xD
    Offline

    1
    ReputationRep:
    I mentioned genetic drift, inbreeding depression, reintroduction into wild, use of stud books in my zoo answer... what did other people write??
    Offline

    1
    ReputationRep:
    (Original post by Cleoleo)
    I mentioned genetic drift, inbreeding depression, reintroduction into wild, use of stud books in my zoo answer... what did other people write??
    I mentioned breeding programs, reintroduction of the species, use of studbooks. Another question I just wrote down everything I could remember about the topic
    Offline

    0
    ReputationRep:
    (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.
    I think that's completely wrong.
    -make agar solution
    -pipette out bacterial broth
    -open lid just enough to allow entry of bacteria
    -use aseptic conditions
    Offline

    0
    ReputationRep:
    (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!
    Umm...i don't think the slime capsule is right..that's cuz there was no LABEL for the cell wall..i'm super sure about that..so it's gotta be cell wall..and a the question said that the diagram showed a TYPICAL prokaryotic cell..and typical cells dont have slime capsules, slime capsules are only SOMETIMES present..so yeh
    Offline

    2
    ReputationRep:
    what did everyone put for the telophase q?
    Offline

    0
    ReputationRep:
    hello how did you find edexcel unit 2 biology?? can i ask you for the question about fertilised eggs i put that nucleus removed from patients body and fused with egg cell and put into bone marrow is that correct? and for the question about how to put bacteria i put bacteria shoud be suspended into agar? the last question about reliable i put that it is not reliable as it was tested on only one bacterium
    ?
    are these similar to what you got?
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by emmakh123)
    what did everyone put for the telophase q?
    The three things that happen in telophase, but adapted to question, like, you'll see decondensed chromosomes, etc.

    (Original post by Great)
    hello how did you find edexcel unit 2 biology?? can i ask you for the question about fertilised eggs i put that nucleus removed from patients body and fused with egg cell and put into bone marrow is that correct? and for the question about how to put bacteria i put bacteria shoud be suspended into agar? the last question about reliable i put that it is not reliable as it was tested on only one bacterium
    ?
    are these similar to what you got?
    It didn't ask about how the egg was fertilised, the IVF had already happened, it was looking for some description of embryos as blastocysts after the 8/16 cell stage after 3/4/5 days of fertilisation in their pluripotency.

    I referenced the ranges about the last question as it was a follow up from the data with plus/minus figures.
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by reefataziz)
    Umm...i don't think the slime capsule is right..that's cuz there was no LABEL for the cell wall..i'm super sure about that..so it's gotta be cell wall..and a the question said that the diagram showed a TYPICAL prokaryotic cell..and typical cells dont have slime capsules, slime capsules are only SOMETIMES present..so yeh
    There was an unlaballed solid, thick, black line preceding the jelly, wavering, jagged structure, i.e. the cell wall. Preceding the thick black line (cell wall) was the empty tubular surrounding (thin double black line) - cell surface membrane.

    Cell walls are linear, composed of carbohydrates in straight chains from the beta glucose monomers. We had to label a non-straight structure, otherwise known as the capsule. Cell walls can not be wavy like that, they surpress the hydrostatic pressure from within the cell, and completely unfold, maximising like an over-inflated balloon so that we see a line like this: _____________________
    Offline

    0
    ReputationRep:
    (Original post by snow leopard)
    There was an unlaballed solid, thick, black line preceding the jelly, wavering, jagged structure, i.e. the cell wall. Preceding the thick black line (cell wall) was the empty tubular surrounding (thin double black line) - cell surface membrane.

    Cell walls are linear, composed of carbohydrates in straight chains from the beta glucose monomers. We had to label a non-straight structure, otherwise known as the capsule. Cell walls can not be wavy like that, they surpress the hydrostatic pressure from within the cell, and completely unfold, maximising like an over-inflated balloon so that we see a line like this: _____________________
    It wasnt wavy it was the same shape as the membrane and did you see the link about the june 09 paper which clearly shows the slime capsule to be a completely different shape to the cell membrane and cell wall
    It was only a one mark question anyways
    Offline

    0
    ReputationRep:
    Okay heres what I can remember.. first the shape question.. with that part about which area showed an endemic species.. which was D coz it had that flag shaped thingy.
    Then there was that tensile strength of nylon question?
    What was gene locus? And that question abt which species.. the one with the less number of alleles or more was at a greater advantage..and then why did two samples from the same species vary?
    That magnesium and calcium question was pretty easy.
    i thought this was a very generalized paper... none of the really detailed theory came apart from RER and Golgi Bodies question =/
    will the boundary be higher or lower for a generalized paper =/
    Offline

    1
    ReputationRep:
    (Original post by xstrawberryswingx)
    Okay heres what I can remember.. first the shape question.. with that part about which area showed an endemic species.. which was D coz it had that flag shaped thingy.
    Then there was that tensile strength of nylon question?
    What was gene locus? And that question abt which species.. the one with the less number of alleles or more was at a greater advantage..and then why did two samples from the same species vary?
    That magnesium and calcium question was pretty easy.
    i thought this was a very generalized paper... none of the really detailed theory came apart from RER and Golgi Bodies question =/
    will the boundary be higher or lower for a generalized paper =/
    high grade boundaries without any doubt
    Offline

    0
    ReputationRep:
    (Original post by Luckyk)
    It wasnt wavy it was the same shape as the membrane and did you see the link about the june 09 paper which clearly shows the slime capsule to be a completely different shape to the cell membrane and cell wall
    It was only a one mark question anyways
    Exactly! The shape was regular - and clearly a Cell Wall! Good luck if you want to argue with Snow Leopard, there have been people on here all day trying to say it was a cell wall.. but getting nowhere!

    Look at it this way - if Snow Leopard put Capsule, thats one incorrect answer - which lowers the boundaries ever so slightly
    Offline

    0
    ReputationRep:
    By high does that mean 60/80 for an A =/
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by TheChief)
    Exactly! The shape was regular - and clearly a Cell Wall! Good luck if you want to argue with Snow Leopard, there have been people on here all day trying to say it was a cell wall.. but getting nowhere!
    ARE YOU SAYING IT WAS STRAIGHT LIKE THIS LINE: _________________ ?

    Lol, please prescribe yourself to specsavers - like, now. :|

    Chemically and logically a cell wall cannot be deflated like a shrivelled prune or semi-wavey ocean, it has to withstand the immense internal hydrostatic pressure of the prokayote and is stretched like rubber band under a tonne of dense gold.

    I assure you, the layer we had to label was alternating gently in its peaks and troughs, as flacid as a floppy banana.
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by xstrawberryswingx)
    By high does that mean 60/80 for an A =/
    One year the raw A boundary was at 65 :/ hopefully won't be as much.
    Offline

    0
    ReputationRep:
    (Original post by snow leopard)
    ARE YOU SAYING IT WAS STRAIGHT LIKE THIS LINE: _________________ ?

    Lol, please prescribe yourself to specsavers - like, now. :|

    Chemically and logically a cell wall cannot be deflated like a shrivelled prune or semi-wavey ocean, it has to withstand the immense internal hydrostatic pressure of the prokayote and is stretched like rubber band under a tonne of dense gold.

    I assure you, the layer we had to label was alternating gently in its peaks and troughs, as flacid as a floppy banana.
    there were no peaks and troughs unless you drew them in lol :P
    Offline

    0
    ReputationRep:
    (Original post by snow leopard)
    ARE YOU SAYING IT WAS STRAIGHT LIKE THIS LINE: _________________ ?

    Lol, please prescribe yourself to specsavers - like, now. :|

    Chemically and logically a cell wall cannot be deflated like a shrivelled prune or semi-wavey ocean, it has to withstand the immense internal hydrostatic pressure of the prokayote and is stretched like rubber band under a tonne of dense gold.

    I assure you, the layer we had to label was alternating gently in its peaks and troughs, as flacid as a floppy banana.
    It was a straight line!! Now you really are boring me.. it was a Cell Wall, get over it!
    Offline

    0
    ReputationRep:
    65 =O are you serious =/ craaap thats outrageously high.. what year was that =S
    Offline

    0
    ReputationRep:
    For the zoo question it sed how wud reintrodcution n captive breedin help so surely u cannt refer to research, education-
    u can talk about organisms matin wiv same species, increase numbers
    keep them protected from hunters,
    increase gentiv diversity

    restore habititts facilitate other species that rely on these species that are released into the wild.
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: August 26, 2011
The home of Results and Clearing

2,107

people online now

1,567,000

students helped last year

University open days

  1. Sheffield Hallam University
    City Campus Undergraduate
    Tue, 21 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Wed, 22 Aug '18
  3. University of Buckingham
    Postgraduate Open Evening Postgraduate
    Thu, 23 Aug '18
Poll
A-level students - how do you feel about your results?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.