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    (Original post by dime_piece)
    Can someone please define & explain the following to me:
    Low critical temperature
    Low lethal temperature
    High critical temperature

    Thanks in advance!
    I cannot seem to find these in the textbook

    Are you sure they are in the specification?
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    (Original post by Mr van der WAALs)
    I cannot seem to find these in the textbook

    Are you sure they are in the specification?
    I don't think they are on the spec but they are on page 163 (i've read through it a couple of times but i still don't understand even though the concept is pretty simple)!
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    I will not be studying anything about:

    Low critical temperature
    Low lethal temperature
    High critical temperature

    What the hell?
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    (Original post by Doughboy)
    I will not be studying anything about:

    Low critical temperature
    Low lethal temperature
    High critical temperature

    What the hell?
    Its covered in the edexcel texbook but its not in the snab textbook. But i do not know if its in the spec or not.
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    (Original post by Abu3005)
    Its covered in the edexcel texbook but its not in the snab textbook. But i do not know if its in the spec or not.
    okay, so what i gather from the textbook is that low critical temp is when the body reaches a low temp which still able to be restored by thermoregulation, low lethal temp is beyond the threshold level and so can't be restored causing death and high critical is the same as low just too hot.

    i very much doubt you'll get asked about it though, they're not in the spec.
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    Is there any site from where I can get the answers to the questions on the Edexcel student book?
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    (Original post by Doughboy)
    I will not be studying anything about:

    Low critical temperature
    Low lethal temperature
    High critical temperature

    What the hell?
    It's covered in the green textbook, which give a lot of background knowledge and knowledge that is there to give you fuller answers and to broaden your understanding, however, I don't think we actually need to know about them in that much detail. Knowing about homeostasis is the key thing.
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    (Original post by jimber)
    Doing (well planning to do) past papers, I hate the book questions/snab sheets personally!
    the past papers are sooo hard and most of the questions arent even in our syllabus!
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    (Original post by Blackelf)
    Is there any site from where I can get the answers to the questions on the Edexcel student book?


    your teacher or school should be having a green A2 biology file which has the answers to all the questions in that textbook!
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    (Original post by Nearing Insanity)
    your teacher or school should be having a green A2 biology file which has the answers to all the questions in that textbook!
    thats the last thing my school will have . thanks anyway!
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    The answers are in the back of the book aren't they?
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    I'm not as confident on this exam as I was on unit 4. I'm really good at all the stuff to do with heart and muscles and respiration but I hate topic 8, I find all the stuff to do with neurotransmitters and axons etc so confusing. And I havn't even seen the scientific article yet so I've done no prep for the synoptic. My teacher said we're are doing it in the next couple of weeks but he's an idiot for leaving it so late.
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    anyone know what the core pracs are for this one? we've only done habituation.
    i looked at the tick sheet for them but it doesn't give much away ):
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    Do we have to write an essay for this exam? or was that the old spec?
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    (Original post by zoe1992)
    The answers are in the back of the book aren't they?
    No, they aren't. Im talking about the Edexcel A2 student book, the green one.
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    (Original post by abcdemilyxx)
    anyone know what the core pracs are for this one? we've only done habituation.
    i looked at the tick sheet for them but it doesn't give much away ):
    The core pracs are there in bold in the specification.
    Isnt the practical paper over? Or are you doing the paper on Jan?
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    Hey guys which book are you doing?
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    (Original post by Isabelle K)
    Hey guys which book are you doing?
    We were given both the green book and the orange book. I personally use the green book more, but for when revising I also use the orange book as the orange book has everything you need to know, but the green book expands on this and gives you background and wider knowledge and a better understanding. for some aspects the orange book is better though.
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    (Original post by Blackelf)
    The core pracs are there in bold in the specification.
    Isnt the practical paper over? Or are you doing the paper on Jan?
    i know, i have no idea how to carry them out though. i presumed like the other three papers this one would include questions about core pracs we've done? i may be wrong, we've not really been told much about how it's structured other than the case study.
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    Page 4

    Miesenbock approach;
    He had to first insert a gene which made P2X2, which then binded to ATP, caused firing of neurones. Made them light-sensitive by placing form of ATP only activated by exposure to light of specific wavelength.

    Para 4- it states the limitation

    ***

    I don't understand exactly what the limitation to his approach is?

    Also, is this related to genetical engineering (AS stuff)....
 
 
 
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