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    I remember writing stroke volume somewhere :/

    Also unofficial mark scheme anyone? :ahee:
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    (Original post by blush.ox)
    I remember writing stroke volume somewhere :/

    Also unofficial mark scheme anyone? :ahee:
    paper first
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    (Original post by medtobe)
    paper first
    Noone has it yet? :sad:
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    (Original post by blush.ox)
    Noone has it yet? :sad:
    no
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    What does inshallah mean?
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    (Original post by LibbyU)
    What does inshallah mean?
    If God wills... (in Arabic)
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    what is the answer for the question that asked about EPO production in Q7 ??
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    (Original post by raednassar)
    what is the answer for the question that asked about EPO production in Q7 ??
    i wrote about transcription factors and repressor molecules preventing the gene from being expressed... some people put negative feedback aswell.. :/
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    Hi guys, did anyone else put in that pH q about muscles that fast twitch muscles respire mainly anaerobic and slow twitch aerobic... therefore lower pH in anaerobic conditions i.e. more lactic acid and so fast twitch muscles more adapted to pH6?
    Also, the only q that I couldn't answer was the troponin one... the q said that taking troponin from fast twitch and putting it in slow twitch made it act like fast twitch (or v.v. i can't remember). I can't find it in any of my (3) textbooks... anyone have an answer?
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    (Original post by Doughboy)
    Unit 5: Energy, Exercise and Coordination


    This unit is worth 40% of your A2 grade and 20% of your total A Level grade.

    Content summary:
    • *ATP, glycolysis, anaerobic/aerobic respiration
      *control and functioning of heart; ventilation and cardiac output
      *homeostasis
      *the nervous system
      *impact of exercise on body, and improving performance
      *hormonal coordination
      *brain structure and development
      *imbalances in brain chemicals
      *Human Genome Project.




    hi doughboy how are you??? i was wondering if you can get the may 2011 edexcel unit 1 and 2 bio and chem papers pleasee can you get them some how i really want them soo badly and its my birthday on tuesday this will be a good present pleaseeee mate i am begging you thank youu

    Assessment:
    This unit is assessed by means of a written examination paper, which lasts 1 hour 30 minutes.

    Assessment information
    Assessment information
    [u]This unit is assessed by means of a written examination paper,which carries 90 marks, lasts 1 hour 30 minutes and will include:[u]
    • *objective questions
      *structured questions
      *short-answer questions
      >and will also cover:
      *How Science Works
      *practical-related questions.


    One question will relate to a previously released scientific article that students will have studied during the course. Students may be asked to summarise the information in the article, and explain or comment upon the biology and other issues within the context of the article. The article may draw on knowledge and understanding from any of the four units 1, 2, 4 and 5. A different article will be provided each year and the examination questions will change to reflect this. This question carries a third of the marks of this unit.

    Unit Description
    Unit Description:
    Topic 7: Run for your life
    This topic is centred on the physiological adaptations that enable animals and humans, particularly sports people, to undertake strenuous exercise. It explores the links between an animal’s physiology and its performance. The topic summarises the biochemical requirements for respiration and looks at the links between homeostasis, muscle physiology and performance. It ends by looking at how medical technology is enabling more people to participate in sport, and by raising the issue as to whether the use of performance-enhancing substances by athletes can be justified.

    Topic 8: Grey matter
    The scene is set by considering how the working of the nervous system enables us to see. Brain imaging and the regions of the brain are considered. The topic also demonstrates how an understanding of brain structure and functioning is relevant to such issues as the response to stimuli, the development of vision and learning. It investigates how imbalances in brain chemicals may result in conditions such as Parkinson’s disease and its treatment with drugs are investigated. Students discuss the ethical issues raised by the Human Genome Project and the risks and benefits of using genetically modified organisms.


    Resources:
    Specification
    Sample Paper , Scientific Article for Sample Paper
    6BI04+5 Notes
    Scientific Article for June 2010
    Old SNAB Unit 6 Article Past Paper Pack



    Let us use this thread to discuss preparations & difficult problems and to analyse the scientific article. We can formulate glossaries and possible questions from the article and we can summarise important data as well.

    Good luck guys! Let the discussion begin! :eek3:

    hi doughboy how are you??? i was wondering if you can get the may 2011 edexcel unit 1 and 2 bio and chem papers pleasee can you get them some how i really want them soo badly and its my birthday on tuesday this will be a good present pleaseeee mate i am begging you thank youu
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    (Original post by JP83)
    Hi guys, did anyone else put in that pH q about muscles that fast twitch muscles respire mainly anaerobic and slow twitch aerobic... therefore lower pH in anaerobic conditions i.e. more lactic acid and so fast twitch muscles more adapted to pH6?
    Also, the only q that I couldn't answer was the troponin one... the q said that taking troponin from fast twitch and putting it in slow twitch made it act like fast twitch (or v.v. i can't remember). I can't find it in any of my (3) textbooks... anyone have an answer?
    Yssss Jen, i did write exactly this for the pH qn and i believe it is ryt, and then i went on by explaining one other point which i can't atm remember....

    Well, as far as i think, in the troponin qn we had to answer from our own basic knowledge and cover a point or two from the spec....so i said that troponin is a protein and it's tertiary and quaternary structure determines whether Calcium ions bind to it or not; it's structure is same whether it is found in either of the two types of muscle fibres therefore the binding of calcium ions to troponin is not affected by the type of muscle fibre the troponin is found in....i hope this is ryt....these points were the only ideas that came into my mind at that time....what did u write for this qn?

    Cheers!
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    (Original post by M Kh)
    Yssss Jen, i did write exactly this for the pH qn and i believe it is ryt, and then i went on by explaining one other point which i can't atm remember....

    Well, as far as i think, in the troponin qn we had to answer from our own basic knowledge and cover a point or two from the spec....so i said that troponin is a protein and it's tertiary and quaternary structure determines whether Calcium ions bind to it or not; it's structure is same whether it is found in either of the two types of muscle fibres therefore the binding of calcium ions to troponin is not affected by the type of muscle fibre the troponin is found in....i hope this is ryt....these points were the only ideas that came into my mind at that time....what did u write for this qn?

    Cheers!
    I thought the question asked why the fast twich fibres replaced with slow twich troponin had the same sensitivity as slow twitch?! They didn't stay the same did they?

    I said that fast twich are used for short bursts of rapid movement so have more sarcoplasmic reticulum and release more ca2+ ions which the troponin is more sensitive to and more abundant to allow for rapid contraction ,.. then i wrote the relevent but of the sliding filament theory out. then I said so replacing it with slow twitch troponin would mean more (the same amount as slow twitch) ca2+ is required for contraction to the same degree.

    I hope I didn't completely misinterpret the question ... But the whole abundance/sensitivity thing I just made up cause I had no idea how to answer it with texbook knowledge
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    have mixed views on this paper now
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    (Original post by JP83)
    Hi guys, did anyone else put in that pH q about muscles that fast twitch muscles respire mainly anaerobic and slow twitch aerobic... therefore lower pH in anaerobic conditions i.e. more lactic acid and so fast twitch muscles more adapted to pH6?
    Also, the only q that I couldn't answer was the troponin one... the q said that taking troponin from fast twitch and putting it in slow twitch made it act like fast twitch (or v.v. i can't remember). I can't find it in any of my (3) textbooks... anyone have an answer?
    Yeah I wrote that about the fibres ... I also said that slow twich respire aerobically which requires more respiritory enzymes which could denature at pH6
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    (Original post by mobius323)
    The strength ran in the mother's side of the family. It didn't say anything about the father's side, so I assumed he had no such mutation. Talking in terms of genotypes, that is definitely an AA genotype.



    The question asked how the boy "could have obtained this mutation." The article said the boy "had a mutation in both copies of the gene". It also said the mother had "a mutation in one copy of the gene". There is no reference to the father having such a mutation, but there is a reference to the mother. Conversely, if the father had been mentioned and the mother had not, it's not accurate to say the mother would have the mutation.

    I've always been taught to work on information I have, not information I would like to have. So, in that case, I worked on the premise that they boy might have obtained the mutation on his own. After all, it asked to suggest a way, not give a way.
    According to that, the mother should also be a superhuman as well. Which the information did not say.
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    Looking at this thread, I know I flopped biology hard. Hopefully I get a B so I can get into uni.
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    The mother is heterozygous recessive, and so is the father since the superbaby is the only human known to have this condition, as it says in the article. So the superbaby is homozygous recessive, making him have the condition. There is a 1 in 4 chance of this happening. And remember, the superbaby has no myostatin, so the allele must be recessive.
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    (Original post by monkeyslut27)
    I thought the question asked why the fast twich fibres replaced with slow twich troponin had the same sensitivity as slow twitch?! They didn't stay the same did they?

    I said that fast twich are used for short bursts of rapid movement so have more sarcoplasmic reticulum and release more ca2+ ions which the troponin is more sensitive to and more abundant to allow for rapid contraction ,.. then i wrote the relevent but of the sliding filament theory out. then I said so replacing it with slow twitch troponin would mean more (the same amount as slow twitch) ca2+ is required for contraction to the same degree.

    I hope I didn't completely misinterpret the question ... But the whole abundance/sensitivity thing I just made up cause I had no idea how to answer it with texbook knowledge
    ummm....well even i hope i did not completely misinterpret the qn...v shall not really worry as v r already done with the exam......v don't know whose answer is right so all v hav got to do is wait for the results and the qps and ms to be out....until then no one will know whose ans is right and whose wrong....i hop all receive the results they deserve....All the best for the 18th of August!!
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    (Original post by jam277)
    According to that, the mother should also be a superhuman as well. Which the information did not say.
    The article says the mother had one mutation and had some excess strength. It also said the boy "was the first to lack any myostatin at all. You can assume from this that the boy was different to his mother.
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    (Original post by mobius323)
    The article says the mother had one mutation and had some excess strength. It also said the boy "was the first to lack any myostatin at all. You can assume from this that the boy was different to his mother.
    And his father.
 
 
 

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