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AQA BIOL5 Biology Unit 5 Exam - 22nd June 2011 watch

  • View Poll Results: Are you resitting this unit?
    YES!
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    NO!
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    (Original post by Safx)
    Really struggling with this unit :/
    What revision methods is everyone using? What works best for you...revision guides, textbooks, online resources?
    Also this sounds a bit weird but is there anyway how you can improve application skills for hsw and making links other than doing past papers? There's only a few.
    I make notes from the Nelson Thornes and CGP books, then do every question I can get my hands on to do with the topic. So I do the NT exam questions, the CGP questions and the past paper questions. I've been doing homeostasis all day and I feel like crying.
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    Can someone please explain to me what mRNA is?
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    (Original post by FristyKino)
    The wolf question on june10 is a major wtf -.-
    agreee with u 100 percent if i had rep i wud rep u mate
    hate aqa all the maths exams especially
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    if both the synoptic essays are based on genetics im doomed
    hate genetics theres so much to learn
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    (Original post by FristyKino)
    Can someone please explain to me what mRNA is?
    Basically mRNA is a way of transporting the genetic code for proteins from DNA in the nucleus to ribosomes in the cytoplasm where the protein chain is created.
    Hope that helps.
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    howmuch synoptic revision has everyone done?
    has everyone learnt everything from AS in detail?
    bit worried
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    (Original post by choc1234)
    howmuch synoptic revision has everyone done?
    has everyone learnt everything from AS in detail?
    bit worried
    its not about detail. breadth not depth.
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    does any1 have any ideas how to do practice Qs on bio apart from past paper and specimen?

    many thanks guys x
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    (Original post by kingsmod1)
    does any1 have any ideas how to do practice Qs on bio apart from past paper and specimen?

    many thanks guys x

    The exam style questions at the end of each topic are pretty useful. Also questions in the CGP book if you have it?
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    (Original post by AboutAn8orA9)
    The exam style questions at the end of each topic are pretty useful. Also questions in the CGP book if you have it?
    Is generator potential and nerve impulse are the same? a bit confused
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    (Original post by FristyKino)
    Can someone please explain to me what mRNA is?
    mRNA (messenger RNA) is a messenger molecule containing complementary base pairs to a DNA template strand. It is used to transport genetic information OUT of the nucleus to the machinery needed in protein synthesis (in the cytoplasm). It is created because DNA is way too big to exit the nucleus, so a smaller molecule is needed.

    It is a type of ribonucleic acid so it contains a) a ribose sugar (rather than deoxyribose in DNA) and b) replaces the base 'thymine' T with 'uracil' U.

    It is suited to its function because it produces an exact complementary sequence to the DNA template strand, meaning it codes for amino acids and hence polypeptides with high accuracy. It is also relatively unstable, meaning after it has been used it is broken down preventing excess protein being produced.
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    (Original post by arvin_infinity)
    Is generator potential and nerve impulse are the same? a bit confused
    A generator potential is what is created in receptors and is a direct result of a stimulus. If the generator potential (the change in p.d. caused by a stimulus) exceeds a THRESHOLD (the minimum p.d. needed to cause an impulse) then an NERVE IMPULSE (passage of an action potential in a neurone) is created. At least this is what I understand it to be, the terminology is kinda vague.
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    (Original post by Flux_Pav)
    suggest why somatic cell therapy more successful in treating diseases caused by a recessive allele than those caused by a dominant allele (2 marks)
    Most likely because if the disease is caused by recessive alleles, only ONE of the alleles (from the mother's and father's chromosomes) would need to be replaced (gene replacement) or supplemented (gene supplementation) with a dominant healthy gene. If it is a dominant allele causing the disease, the healthy gene would be recessive so there is a chance that two healthy genes would have to be inserted, which is much more difficult when using gene therapy via somatic cells.
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    (Original post by l4ith)
    Most likely because if the disease is caused by recessive alleles, only ONE of the alleles (from the mother's and father's chromosomes) would need to be replaced (gene replacement) or supplemented (gene supplementation) with a dominant healthy gene. If it is a dominant allele causing the disease, the healthy gene would be recessive so there is a chance that two healthy genes would have to be inserted, which is much more difficult when using gene therapy via somatic cells.
    thanks
    and also for the latter, inserting two healthy recessive genes will only work by gene replacement rather than supplementation right? because recessive alleles cannot mask the effects of the dominant alleles
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    Correct Inserting a functional gene (with recessive alleles) does not remove the defective gene (with dominant alleles) - it just means that the cells produce both functional and non-functional proteins at the same time
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    I'm fine with everything including synoptic essays, except gene technology. Our teacher had to rush the course towards the end, so I'm learning, as opposed to revising
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    (Original post by Ineluctable)
    I'm fine with everything including synoptic essays, except gene technology. Our teacher had to rush the course towards the end, so I'm learning, as opposed to revising
    Jealous. How did you get comfortable with the synoptic essays?
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    (Original post by tehsponge)
    Jealous. How did you get comfortable with the synoptic essays?
    They aren't hard. Just look over the specifications of the other units. You don't have to know anything in great detail, just pick the relevant points.
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    guys, i think im gonna get BBB at A level wid bio chem and maths (strted wid DDD)

    i have always wanted an A and i feel these grades are terrible at A level just for myself

    do u lot think its that bad

    p.s. bio 5 is makin gd progress :P
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    (Original post by Ineluctable)
    They aren't hard. Just look over the specifications of the other units. You don't have to know anything in great detail, just pick the relevant points.
    I thought they had to be as detailed as the 6 mark questions you get at the end of the unit 4 paper? I've always thought of them as like 3/4 of those questions. Also I can't remember much from unit 2 because I found it so mind numbingly boring.
 
 
 
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