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BIOL4 Biology Unit 4 Exam - 13th June 2011 watch

  • View Poll Results: Are you resitting this unit?
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    (Original post by coffee345)
    is anyone here doing BIOL5 revision as well?

    I havent started revisiing for unit 5 yet
    neither! I've got 3 exams on monday (including this one) so after that, purely biol 5!
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    (Original post by Rose1990)
    The questions gives, resus negative( phenotype/ genotype) does not give us allele frequency. Hardy weingberg is all to do with finding frequency of allele.

    So resus negative= 16% =0.16
    Q^2=0.16 ( Q^2 represent homozygous recessive genotype)
    q=0.4 , p+q=1.
    P=0.6. 2pq= 48%

    This is how I make sense of this kind of questions. :dontknow:
    why cant u do 1 - 0.16 straigt away like the others

    some1 help?
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    (Original post by tehsponge)
    LOL who just neg repped me for that? ****ing pathetic.
    I know, some people don't really appreciate it when you're giving others help :rolleyes:

    I have corrected the wrong and gave you a thumbs up :^_^:
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    Hey guys, I never really wondered this myself until now, but can you like abbreviate molecules in exams like co2 intend of writing carbon dioxide? It just that by looking at the markschemes they right it abbreviated... sorry for the stupid question.
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    STOP NEGGING PEOPLE!!!!!


    (Original post by Reccoshai)
    Hey guys, I never really wondered this myself until now, but can you like abbreviate molecules in exams like co2 intend of writing carbon dioxide? It just that by looking at the markschemes they right it abbreviated... sorry for the stupid question.
    You abbreviate Co2 and o2 and stuff but when it comes to things like GP, RuBP, I got told to write in once in full form them you can abbreviate them.
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    (Original post by User12399)
    STOP NEGGING PEOPLE!!!!!




    You abbreviate Co2 and o2 and stuff but when it comes to things like GP, RuBP, I got told to write in once in full form them you can abbreviate them.
    Thank alot! Really dont understand the people neg reping.,but anyways cheers its just that I always wrote the full form of everything and if I can write abbreviations of something I could really save time.
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    (Original post by kingsmod1)
    why cant u do 1 - 0.16 straigt away like the others

    some1 help?
    There is difference between genotype (Bb) and allele(B)or (b)
    p+q=1 ( this lets us work out the allele frequency)

    P^2+2pq+p^2=1 ( this lets us predict genotype frequency)

    The question you mentioned in earlier post, gives us genotype(0.16) and your asked to find heterozygous( 2pq).

    p^2=0.16 ----> But to work out heterozygous ,we need "p" and not the square . (Rest of the solution in earlier post) Hope this helps.
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    what is the advantages of uses organic fertilliser?
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    (Original post by User12399)
    You abbreviate Co2 and o2 and stuff but when it comes to things like GP, RuBP, I got told to write in once in full form them you can abbreviate them.
    For AQA you don't have to remember the full names of Ribulose Bisphosphate or Triose Phosphate or the complicated names, it was mentioned at a conference and you only need to know the abbreviations for them(G-3-P, GALP, RuBP ect). Although the examiners will be happy if you know what they stand for!
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    (Original post by tehsponge)
    http://www.mediafire.com/?ynzizznywym
    This was posted a while ago, its a file with like 500 pages of old spec questions.
    Woops. Just realised that its unit 5.
    Do you have a similar file for Unit 4? Thanks in advance.
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    (Original post by ben10)
    what is the advantages of uses organic fertilliser?
    Organic fetilisers are usually cheaper and have a longer lasting effect on the soil. Whereas other fertilisers like ammonia are more expensive and have to be applied more often.
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    (Original post by Blackshadow)
    Do you have a similar file for Unit 4? Thanks in advance.
    I don't have one, sorry. There will probably be one out there somewhere though...
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    (Original post by Eloades11)
    Organic fetilisers are usually cheaper and have a longer lasting effect on the soil. Whereas other fertilisers like ammonia are more expensive and have to be applied more often.
    Why is that? I would have thought inorganic nitrogen fertilisers would have to be applied less often because they can be engineered to provide enough nitrates to the crops?
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    (Original post by tehsponge)
    Why is that? I would have thought inorganic nitrogen fertilisers would have to be applied less often because they can be engineered to provide enough nitrates to the crops?
    Bacteria takes time to break down the organic fertilisers, so the plant absorbs the nutrients slowly. Whereas the inorganic ones just get absorbed straight away(or washed away by rain), and would need to be re-applied at specific intervals to keep sufficient growth of crops.
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    (Original post by Eloades11)
    Bacteria takes time to break down the organic fertilisers, so the plant absorbs the nutrients slowly. Whereas the inorganic ones just get absorbed straight away(or washed away by rain), and would need to be re-applied at specific intervals to keep sufficient growth of crops.
    Ah, that makes sense. I'd rep you but it says I've repped you too many times
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    Hiya, does anyone have the markscheme for Unit 4 January 2011??? Thankyou!
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    (Original post by EavieQu)
    Hiya, does anyone have the markscheme for Unit 4 January 2011??? Thankyou!
    Its at the start of this thread
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    (Original post by Tericon)
    Its at the start of this thread
    Got it! Thankyou!
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    any ideas on the last 6 mark topics?
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    (Original post by Eloades11)
    Bacteria takes time to break down the organic fertilisers, so the plant absorbs the nutrients slowly. Whereas the inorganic ones just get absorbed straight away(or washed away by rain), and would need to be re-applied at specific intervals to keep sufficient growth of crops.
    Also inorganic fertilizers tend to be very soluble and can be easily leached away by heavy rain and therefore need to be reapplied often.
 
 
 
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