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    You guys! What happend to going through the spec?
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    Where did you get to?
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    Good Luck everyone
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    (Original post by samydude)
    guys, i know this is like not the moment, well it might is (if your desperate), lets get in an instant chat - come here to brain tease or to give ur neurones a quick fiery last minute revision.
    Join here, takes only moments -

    http://brizz.ly/di9r32
    Or get me on MSN.
    Peace.
    Tried it but is running really slow for me :banghead:
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    (Original post by Cimul8r)
    why cant i write it like that in an exam. LOL
    Oh I don't write like that in exams! it's more like 'ermm, reproductively isolated? something abouttt..... alleles....?'

    haha

    Im learning NPP and GPP, and how to work out transfer efficiency.

    Thankyou samydude, for the HIV/TB info

    FML - <44
    lolllll
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    Never mind my previous post.

    Guys lets get into IRC - instant msging - go here http://qchat.rizon.net/
    then choose ur nickname and type "eBIO4" in the channel.
    We can discuss there.
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    (Original post by peterejhamilton)
    Where did you get to?
    Photosynthesis :p:
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    Guys, wtf is this objective about?

    Describe the role of the scientific community in validating new
    evidence (including molecular biology, eg DNA, proteomics)
    supporting the accepted scientific theory of evolution
    (scientific journals, the peer review process, scientific
    conferences).
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    (Original post by Doughboy)
    Guys, wtf is this objective about?

    Describe the role of the scientific community in validating new
    evidence (including molecular biology, eg DNA, proteomics)
    supporting the accepted scientific theory of evolution
    (scientific journals, the peer review process, scientific
    conferences).
    It's all about the theory of evolution and how organisms evolved from common ancestors, proof in DNA evidence/Proteomics.
    Once you get that nailed down you have to know how to go about proving such theories using scientific journals (publish your experiment, theory, evidence,data etc) to be evaluated and repeated, Peer review where everyone in your field evaluates the work and tries it themselves and Conferences where scientists share information.

    The two are linked because the "Theory" of evolution had to be proved, it's an easy link for them to potentially make in a paper e.g Explain how the theory of evolution is supported by DNA and how you would go about proving said theory or something like that
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    So we're done photosynthesis!

    Discuss how understanding the carbon cycle can lead to
    methods to reduce atmospheric levels of carbon dioxide
    (including the use of biofuels and reforestation).

    Well according to the cycle, plants use CO2 in photosynthesis so it makes more sense to plant more trees. Biofuels are carbon neutral because whatever carbon they took in during growing will be released during burning. I made a detailed post earlier in this thread about this objective: http://www.thestudentroom.co.uk/show...7&postcount=28
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    Guys: Go here: http://qchat.rizon.net/
    enter: eBIO4 EXACTLY THIS [COPY PASTE]
    pick your name and we can discuss the unit.
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    Yup, basically means reforestation as a carbon sink to remove existing CO2 and use of biofuels as a carbon neutral energy source
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    This is a perfect answer to memorise for HIV (what exactly happens);

    - gp 120 on HIV virus
    - binds with CD4 receptors
    - on surface membrane of t-helper cells (MS did say lymphyocyte, but t-h cell is more specific)
    - viral RNA enetrs the lymphocyte
    - viral RNA used to produce viral DNA
    - by action of reverse transcriptase
    - new virsuses formed
    - T-helper cells destroyed when new viruses leave host cell
    - T killer cells destroy t-helper cells

    ***

    Can anyone write the process for TB?... And are both the dormant and active stages part of the process?
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    (Original post by pingu09)
    This is a perfect answer to memorise for HIV (what exactly happens);

    - gp 120 on HIV virus
    - binds with CD4 receptors
    - on surface membrane of t-helper cells (MS did say lymphyocyte, but t-h cell is more specific)
    - viral RNA enetrs the lymphocyte
    - viral RNA used to produce viral DNA
    - by action of reverse transcriptase
    - new virsuses formed
    - T-helper cells destroyed when new viruses leave host cell
    - T killer cells destroy t-helper cells

    ***

    Can anyone write the process for TB?... And are both the dormant and active stages part of the process?
    Thanks,


    a lot!
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    Model answer for gel electrophoresis:

    1. Use of {agarose / polyacrylamide} gel;
    2. DNA loaded into wells / description;
    3. Use of a buffer;
    4. {pd / current} applied;
    5. (Negatively charged) DNA moves to (positive) electrode;
    6. DNA fragments move according to {charge / size} / {smaller go
    further or faster / converse} / eq;
    7. Transfer DNA to {nylon / nitrocellulose} (paper) / southern
    blotting;
    8. DNA strands separate (exposing base sequences) / single
    stranded / use of alkali;
    9. Gene probe with complementary sequence;
    10. {Binds / eq} to faulty gene;
    11. Use of {radioactive / fluorescent} labelling;
    12. Use of imaging technique (e.g. X-ray, UV, laser);
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    (Original post by pingu09)
    (b) Suggest one disadvantage of T cells killing infected human cells. (1)
    Cell lysis releases the contents of the cell therefore potentially allowing reinfection. (It is preferable to have natural cell death or "apoptosis" as this does not do this)

    (c) Explain how a mutation of HIV could lead to the viral peptide presented by the
    infected cell being unrecognised by active T killer cells.
    T-killer cells detect a specific complementary antigen on cells they target, mutations cause the shape of this antigen to possibly change and therefore are once again immune
    I don't think these were answered so I thought I would... if you are still here to read them
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    (Original post by Disto)
    I don't think these were answered so I thought I would... if you are still here to read them
    Thanksss! :-)
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    Good luck guys.
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    you too!
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    When are we allowed to discuss the exam?
 
 
 

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