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    (Original post by Viva009)
    what does the term 'genetic code' actually mean?
    Genetic code has many properties. It is a triplet code which is a set of three bases that codes for one amino acid. Also, it is degenerate. Degenerate means that each amino acid is determined by more than one code bar one. Also, they are sometimes stop codons which signify the end of the polypeptide chain. They are widespread but not universal due to the fact that the same codon usually codes for the same amino acid in all organisms, however this is not always the case.
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    (Original post by katie93)
    I'm just about to have a look through the past papers/specification and see what hasn't been asked yet, but im thinking maybe nitrogen cycle? and probably meiosis too
    I posted a document on this thread with a list of everything that has and hasn't been on yet I'll put it on again incase you missed it.
    Attached Images
  1. File Type: pdf A2 Biology F215- Topics covered on previous exams (before June 2011).pdf (173.3 KB, 238 views)
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    Found this youtube clip really useful if anyone's struggling with epistasis

    http://www.youtube.com/watch?v=EnG3s5F8S14
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    How are people revising for this exam by the way? What are your techniques??
    Mindmaps, cartoons, past questions, powerpoints, flash cards.
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    Can there be a 6/7 marker on the procedure of electrophoresis? If there is, i hopefully want it to come up. :P
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    (Original post by ManPowa)
    Can there be a 6/7 marker on the procedure of electrophoresis? If there is, i hopefully want it to come up. :P
    There can be on anything... I think the spec says we need to explain it, so I'm sure there could be. Although I think it would be more likely to be on the use of electrophoresis and then DNA probes. For those kind of questions, there are always at least 15 points you could make, and I think it would be difficult to find those points for just electrophoresis.
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    i think everyone missed my post
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    Can someone help me?

    In the PCR reaction, why are primers required? And why can the enzyme DNA polymerase itself bind to DNA fragments?

    thanks in advance
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    (Original post by TobeTheHero)
    i think everyone missed my post
    didums
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    (Original post by kabolin)
    didums
    Attached Files
  2. File Type: rtf Cellular control questions F215.rtf (1.18 MB, 108 views)
  3. File Type: rtf Cellular control answers F215.rtf (220.5 KB, 68 views)
  4. File Type: rtf Biotechnology and gene tech questions F215.rtf (1.46 MB, 103 views)
  5. File Type: rtf Biotechnology and gene tech answers F215 (1).rtf (137.4 KB, 72 views)
  6. File Type: rtf Ecosystems and sustainability questions F215 part 1.rtf (1,019.5 KB, 80 views)
  7. File Type: rtf Ecosystems and sustainability questions F215 part 2.rtf (716.2 KB, 76 views)
  8. File Type: rtf Ecosystems and sustainability questions F215 part 3.rtf (754.2 KB, 71 views)
  9. File Type: rtf Ecosystems and sustainability answers F215.rtf (81.0 KB, 60 views)
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    the more i revise... the more I feel like something is missing... so revise more and then it feels like I havent revised certain bits.. its scary
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    can someone explain to me how to work out the expected value in a chi squared test?
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    (Original post by greenford)
    the more i revise... the more I feel like something is missing... so revise more and then it feels like I havent revised certain bits.. its scary
    Can you elaborate on this please? I'm getting scared by what you mean now
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    (Original post by sportycricketer)
    Can you elaborate on this please? I'm getting scared by what you mean now
    its just that iology revision is getting on my head.... 6 hours biology everyday... whenever I revise something...it feels like i've missed something but when I go back to it...i know it... :confused::confused:
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    (Original post by greenford)
    its just that iology revision is getting on my head.... 6 hours biology everyday... whenever I revise something...it feels like i've missed something but when I go back to it...i know it... :confused::confused:
    Ahh right ok what are you doing in these 6 hours?? reading through notes etc??
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    (Original post by sportycricketer)
    Ahh right ok what are you doing in these 6 hours?? reading through notes etc??
    read notes... do question pack... read notes again..memorise... do little sticky notes of extra information thats not in the book...etc etc..
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    (Original post by ManPowa)
    Can someone help me?

    In the PCR reaction, why are primers required? And why can the enzyme DNA polymerase itself bind to DNA fragments?

    thanks in advance
    In annealing the temperature is reduced to 53 degrees. The primers bind to each end of the target sequence to be copied and they replicate the DNA using the free nucleotides.

    And are you going on about taq polymerase in the 2nd qyestion? If so what happens is the temperature is raised to 72 degrees which is the optimum temperature of taq polymerase. Therefore this allows the binding of the taq polymerase to the primers that are attached to the DNA fragment.
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    hey

    how can dissipating proton gradient induce apoptosis?

    Transcription factors in hox clusters?
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    Questions on Homeobox genes?

    are Hox clusters Homeobox gene located on separate C'somes

    but all together are the hox clusters homebox genes?
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    okay so I've gone through the whole of the bio book and the spec but still don't know anything! Do you think mindmaps are a useful way of revising? I've tried making notes but they don't really help me
 
 
 
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