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

  • View Poll Results: Are you resitting this unit?
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    (Original post by appleschnapps)
    Yeah, I got overly excited in my diagram making there. IGNORE THE PARTIAL CUTS AT 3 AND 5.


    No worries.

    I would really appreciate if you could explain part 9b(ii) and (iii) on the spec paper
    http://store.aqa.org.uk/qual/gce/pdf...5-W-SQP-07.PDF
    I am panicking
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    (Original post by Cyanohydrin)
    Sorry, but how do you link this to the specific base sequence?
    Sorry, its been a few hours and im tired and a bit panicky, what do you mean by specific? Which specific?
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    (Original post by gunit123)
    can some1 plz explain the sliding filament theory?
    Once a cross bridge is formed, the Myosin heads change angle, pulling the actin fillaments over them as they do so. This shortens the length of the sarcomere and allows the muscle to contract.
    Ca2+ then activates ATPase which hydrolyses ATP into ADP and Pi to release energy for the detatchement and reformation of actomysoin cross bridges further along the actin. ( i think)

    Or did you want the mechanism?
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    http://www.youtube.com/watch?v=aPN8LP4YxPo

    This is really good.
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    I have gotten to the point were i literally cant be ****ed to do anymore biology, think I'll have an early night, like 10-11 :]
    Are you guys gunna try and do some revision in the morning?
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    (Original post by Boo!xx)
    I have gotten to the point were i literally cant be ****ed to do anymore biology, think I'll have an early night, like 10-11 :]
    Are you guys gunna try and do some revision in the morning?
    Yeah, I'm just going to go over a few essays that I've done in the morning. Gon'a sleep around 3ish I think.
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    (Original post by Tericon)
    Sorry, its been a few hours and im tired and a bit panicky, what do you mean by specific? Which specific?
    I have just read the bit in NT where it talks about the fluoresecent dyes used to label the terminator



    So in the case of the above..

    is it

    AATGCTAGC

    ?
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    in the sliding filament theory do the Ca+ activate ATPase to hydrolyse ADP to ATP or isit hydrolysis of ATP to ADP?
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    i dont undesrtand the point of the sanger method by adding terminator nulceotides, i know it stops process but what is the point????

    Many thanks :P
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    (Original post by Jasx)
    in the sliding filament theory do the Ca+ activate ATPase to hydrolyse ADP to ATP or isit hydrolysis of ATP to ADP?
    the latter.
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    (Original post by Consilio Et Animis)
    A major resource for the essay. Hope they come in handy to you guys. Good luck! Also have a book (pdf) on writing the essay but it seems too big to attach
    can you email it to me please?
    I'll pm my it to you now...

    thanks so much in advance.
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    (Original post by Jin3011)
    Once a cross bridge is formed, the Myosin heads change angle, pulling the actin fillaments over them as they do so. This shortens the length of the sarcomere and allows the muscle to contract.
    Ca2+ then activates ATPase which hydrolyses ATP into ADP and Pi to release energy for the detatchement and reformation of actomysoin cross bridges further along the actin. ( i think)

    Or did you want the mechanism?
    mechanism please. i do understand when muscle contraction is triggered by an influx of Ca2+ions though.
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    (Original post by NRican)
    No worries.

    I would really appreciate if you could explain part 9b(ii) and (iii) on the spec paper
    http://store.aqa.org.uk/qual/gce/pdf...5-W-SQP-07.PDF
    I am panicking
    http://www.thestudentroom.co.uk/show...141&highlight=

    Remember, if you have more than one radioactive fragments, it is including partial digests so the first cut in the sequence will be the smallest radioactive fragment. Then, because the next radioactive fragment is at 4kb, it must be 3+1.
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    (Original post by gunit123)
    can some1 plz explain the sliding filament theory?
    http://www.thestudentroom.co.uk/show...887&highlight=

    Is this okay?

    [Oh ew, double post. Apologies.]
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    (Original post by Jasx)
    in the sliding filament theory do the Ca+ activate ATPase to hydrolyse ADP to ATP or isit hydrolysis of ATP to ADP?
    Ca2+ activate ATPase which hydrolyses ATP into ADP and Pi.
    You could say the hydrolysis of ATP to ADP but its better to include the finer detail to make sure you get the marks
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    (Original post by Cyanohydrin)
    I have just read the bit in NT where it talks about the fluoresecent dyes used to label the terminator



    So in the case of the above..

    is it

    AATGCTAGC

    ?
    Yes, that would give you the complementary base sequence, aka the sequence of the strand produced in the PCR.

    So original sequence = TTACGATCG
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    http://www.youtube.com/watch?v=x5yPkxCLads
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    (Original post by Jasx)
    in the sliding filament theory do the Ca+ activate ATPase to hydrolyse ADP to ATP or isit hydrolysis of ATP to ADP?
    the calcium binds to the troponin which moves the tropomyosin - allowing the myosin head to leave/bind the actin site...
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    (Original post by appleschnapps)
    http://www.thestudentroom.co.uk/show...141&highlight=

    Remember, if you have more than one radioactive fragments, it is including partial digests so the first cut in the sequence will be the smallest radioactive fragment. Then, because the next radioactive fragment is at 4kb, it must be 3+1.
    Thank you for helping me with this btw Big weight off my mind
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    (Original post by Tericon)
    Yes, that would give you the complementary base sequence, aka the sequence of the strand produced in the PCR.

    So original sequence = TTACGATCG
    ah of course, thanks :yy:
 
 
 
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