Hey there! Sign in to join this conversationNew here? Join for free
x 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

    2
    ReputationRep:
    I'm annoyed that people thought it was quite easy, because the people in my year who found it easy were the ones who didn't revise so much, whereas I've spent so long on it and am really disappointed in myself

    I just want to go into A2 with a high A (my coursework was 40/40 and my Jan exam for Unit 1 was 108/120 UMS) so I might have to re-take this paper next January and hope a better one comes up with stuff I'd actually revised!!!
    Offline

    5
    ReputationRep:
    do u think i would get a mark if i said golgi apparatus makes lysosomes?
    Offline

    2
    ReputationRep:
    (Original post by heyadinzi)
    yeh so did i !! what other questions came up that were hard.. the telophase one was annoying !! what did u do for the crossing over one
    I first literally swapped over the colours for the whole pieces that they pointed at
    but then i thought hmmm maybe thats too easy, so rubbed out my shading up till the point they pointed at, so the left X was grey with half of its top right bit white, and the right X was white with its top half of the top left bit grey

    if that makes sense haha
    what did everyone else do for the crossing over Q???
    Offline

    5
    ReputationRep:
    (Original post by britchick)
    I said 23,000 for that reason too, so it could be able to code for all proteins and to carry out all functions etc

    For the Golgi Apparatus question:
    - at least 3 convex sacs ranging from smallest to largest
    - the largest sac is the sac facing the ER i.e. the smallest sac is where functions are last carried out and is closest to the membrane
    - the smallest sac is more condense with enzymes, which might be visible with a stain
    - i drew a labelled diagram in case my explanation didnt make sense XD

    For the Golgi apparatus/rER question:
    - the transcripted RNA comes through the nuclear pores and attaches to the ribosomes (proteins) on the rER's surface
    - the protein and genetic information travel through the rER, taking its 3D-like structure along the way
    - vesicles pinch off the ends of the rER containing the protein and genetic information
    - vesicles travel through the cytoplasm to the ends of the G.A's sacs, where they fuse into
    - enzymes in the G.A modify the protein along its journey
    - this includes the idea that if certain proteins need to be a certain direction e.g. receptors, the protein is turned in a certin way so it can be facing the rigth direction
    - vesicles pinch off the ends of the G.A and travel to fuse with the cell membrane so it can carry out either intercellular/extracellular functions
    lool haha i drew a diagram too for this exact reason and then labelled it
    Offline

    2
    ReputationRep:
    (Original post by godknowsprerna)
    what did u guys write about the endemism questions .. i wrote its in Area D cauz tht was the only area with a unique species o.O to other areas
    YES that's what I did! Woohoo! A question I've seen I did right!
    Offline

    0
    ReputationRep:
    (Original post by pakizrulez)
    do u think i would get a mark if i said golgi apparatus makes lysosomes?
    Yes, you will.
    Offline

    0
    ReputationRep:
    For the bacteria questions, the awnser was evenly spread the bacteria all over the petri dish to create accurate results whilst using gloves.
    • Thread Starter
    Offline

    1
    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 just said something like pour it in using gloves. Hopefully a mark for the gloves part.
    Offline

    2
    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.
    Yeah, you melt the agar to a liquid form, add the bacteria, shake gently to disperse the bacteria evenly, then wait to solidify
    • Thread Starter
    Offline

    1
    ReputationRep:
    Guys what did two labels did you circle on the egg cell question?

    In an egg cell there are eight haploid cells. I believe you could have picked any two except polar nuclei (which are diploid collectively, they fuse with the haploid male gamete to make a triploid endosperm). So any combination of egg cell/synergid/antipodal right?
    Offline

    2
    ReputationRep:
    (Original post by snow leopard)
    Guys what did two labels did you circle on the egg cell question?

    In an egg cell there are eight haploid cells. I believe you could have picked any two except polar nuclei (which are diploid collectively, they fuse with the haploid male gamete to make a triploid endosperm). So any combination of egg cell/synergid/antipodal right?
    This question was worded SO badly, "circle two of the labels of two haploid cells"
    ...WTH?

    I drew a circle around one polar nuclei in the middle, and the bottom middle cell, because I know that's haploid as it fuses with one of the generative nuclei to become diploid.

    Someone said they circled the label words i.e. "polar nuclei" and "antipodal", but I cricled the actual cells, is this wrong? :\
    Offline

    5
    ReputationRep:
    where does mitosis happen?....what did you cross ?
    Offline

    2
    ReputationRep:
    (Original post by pakizrulez)
    where does mitosis happen?....what did you cross ?
    I think I said stem cells. It was a guess
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by britchick)
    This question was worded SO badly, "circle two of the labels of two haploid cells"
    ...WTH?

    I drew a circle around one polar nuclei in the middle, and the bottom middle cell, because I know that's haploid as it fuses with one of the generative nuclei to become diploid.

    Someone said they circled the label words i.e. "polar nuclei" and "antipodal", but I cricled the actual cells, is this wrong? :\
    No that someone is correct - it was labels! Sorry

    Tricky question nevertheless, you either had to have further knowledge that all eight cells are haploid in the embryo sac, or guess that it was antipodal or synergid given it couldn't be polar nuclei.
    Offline

    2
    ReputationRep:
    (Original post by snow leopard)
    No that someone is correct - it was labels! Sorry

    Tricky question nevertheless, you either had to have further knowledge that all eight cells are haploid in the embryo sac, or guess that it was antipodal or synergid given it couldn't be polar nuclei.
    Damn. I hate how I seem to have done so badly and everyone else found the paper quite nice
    Offline

    5
    ReputationRep:
    (Original post by britchick)
    I think I said stem cells. It was a guess
    lool sameeee
    i like your thinking britchick haha
    its similar to myn
    Offline

    0
    ReputationRep:
    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 .
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by britchick)
    Damn. I hate how I seem to have done so badly and everyone else found the paper quite nice
    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
    Offline

    0
    ReputationRep:
    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?
    Offline

    0
    ReputationRep:
    (Original post by godknowsprerna)
    oh my god o_o you are right o_o chemical signals turn the genes on which differentiates it :/ tht means to start with all the genes are off :/ ughhhh how stupid of me
    so what is the answeer then? 23000 or 11000?
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: August 26, 2011
Poll
Do you agree with the proposed ban on plastic straws and cotton buds?

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.