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    (Original post by ghogho)
    okay first let me explain for u the question...

    there was sepreate culturs of bacteria each culture was either grawn in lactic acid or pyruvic acid, or molecule B or C.....and the initail conc. of the substarates was all the same okay
    then the experiment was to measure the uptake of oxygen.
    nw the qu says that u have to use & link between the information in the digram and the graph to suggest the differnce in the uptake of oxygen by the bacteria in each substarte.....okay
    nw the ans is.....
    well the fisrt three points in the markscheme means that u first explains the role of oxygen in respiration and the main stages of cellular respiration then u describe the graph and comare between pyruvic acid, and the molecules B and C
    well the rest of the points in the ms are all suggestions wich u can understand from the graph.... like the purvic acid is more favrable for bacteria than molecule B and C
    btw from the10 points in the ms u need a max of 5 to achive the full mark...
    well i wish that my explanation is helpful
    Thank you very much. I didn't really tak about respiration because it wasn't boldly asked for.
    Next time, whenever I see a keyword, I'm going to write about the topic that relates to the key word
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    (Original post by This Honest)
    Thank you very much. I didn't really tak about respiration because it wasn't boldly asked for.
    Next time, whenever I see a keyword, I'm going to write about the topic that relates to the key word
    ur welcome
    but dont over talk about the topic inorder not to waste time and the run out of time and always try to write ur ans as points the examiners prfare that * i read their comments in the exaimener report and that what they said *
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    (Original post by ghogho)
    ur welcome
    but dont over talk about the topic inorder not to waste time and the run out of time and always try to write ur ans as points the examiners prfare that * i read their comments in the exaimener report and that what they said *
    Yeah I did that in jan but for this June paper, ended up rushing my answers so I didn't think properly and just wrote paragraphs :mmm:
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    Does anyone have/know where I can find a mock paper for this years advanced notice?
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    (Original post by ghogho)
    ooohhh that is alot my dear :indiff:
    well i truely wish u best of luck and im sure u can do it just schedule ur time.
    and there is still time to revise for all the subjects
    just stay calm and do some prays and everything will be all ryt

    wish u best of luck ;D
    Thank you, please pray for me! lol I'm so stressed out o_O Thanks! Good luck to you too
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    (Original post by Bright)
    I am soooooooooooooooo behind. I'm going to only have like a day to revise all this + article.

    I need a 126/180 UMS to get an A (including coursework) I hope we all get our grades!
    Similar to me, I need 130UMS to get an A!!
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    Can anyone help me on Q1c on june 11. I don't know why the MS says marking point 1 and 2.

    QP: http://www.edexcel.com/migrationdocu...e_20110622.pdf

    MS: http://www.edexcel.com/migrationdocu...s_20110817.pdf
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    (Original post by Bright)
    Thank you, please pray for me! lol I'm so stressed out o_O Thanks! Good luck to you too
    i will pray for u alot
    wish u best of luck
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    (Original post by bertiejess)
    Similar to me, I need 130UMS to get an A!!
    How I'd do anything to get what I got in any of my AS modules :'(
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    Doe anyone know how what grade 89 ums is?
    Me needs 89ums for the A grade and 108 for the A*
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    (Original post by ghogho)
    i will pray for u alot
    wish u best of luck
    Thank you, I shall do the same for you
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    (Original post by Gman1234)
    Doe anyone know how what grade 89 ums is?
    Me needs 89ums for the A grade and 108 for the A*
    That'd be a B 96 UMS is an A.
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    (Original post by Bright)
    That'd be a B 96 UMS is an A.
    Ooh, brilliant. Anyone know roughly how many marks that is?
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    Hi guys, are you allowed to take the article in with you?
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    (Original post by Jack5r)
    Hi guys, are you allowed to take the article in with you?
    I think you get a clean copy in the exam...
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    does anyone else find the ventricular ectopic beat question (4c) on the june 10 paper stupid -_-
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    (Original post by Jack5r)
    Hi guys, are you allowed to take the article in with you?
    no we r not allowed.... they will give u a copy with the qu paper but before the exam starts check that the article is inside the qu cuz last jan when i sat for the exam it wasnt present with the qu and i had to ask for it
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    (Original post by maribellaaaa)
    does any one have bio scientific articles
    this is the article
    Attached Images
  1. File Type: pdf June 2012 Scientific Article (1).pdf (109.9 KB, 58 views)
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    Can't start revising this until after my Sociology exam on the 19th -.- this is going to be so much worse than unit 4!
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    Hello. Just been reading this thread as I work as a biology tutor and helping someone with Unit 5. I've also read through the pre-release paper and thought I could maybe help you all on the DNA methylation bit (as I have a Ph.D on that subject!).

    Basically, DNA methylation is when cytosine bases are tagged with a methyl group. This attracts specific proteins which bind the methylated DNA and then act as transcriptional repressors (stopping RNA polymerase from binding). DNA methylation often occurs in the promoter region of genes (which is where RNA polymerase normally binds).

    So whenever DNA is methylated, it is basically being targeted for silencing. Interestingly, it is often seen in cancer where genes that should be active are switched off (cell-cycle regulator genes for example), which leads to a loss in control of the cell cycle and therefore uncontrolled cell division can occur.

    Also, differentiation of stem cells involves DNA methylation - as the cells become specialised, non-required genes are switched off (using DNA methylation).

    Hope this helps!!
 
 
 
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