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EDEXCEL Biology Unit 2 6BIO2 21st May 2012

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    (Original post by ShmangoBaby)
    Here are my notes for Cells and Plants and the core practicals..

    http://www.scribd.com/doc/48506933/A...ctical-Summary
    Thanks!! This is really helpful!! xo
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    does anyone have the grade boundaries for the past papers?
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    (Original post by titch_04)
    does anyone have the grade boundaries for the past papers?
    for which year ?
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    Do we have to kno about transpiration of water through the xylem and the sympoplast and apoplast way??
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    Wow i wanna do dentistry or a doctor realted course at uni, have you got any advice??? ive not done much reasearch on it as i am totally focusing on my exams right now
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    does anyone know anything about using embryos for stem cells and the ethical issues around it?

    I am scared that there will be a four mark question about this. :eek:

    I can only think of: some people believe that a genetically unique individual is created at fertilisation and that this new individual has a right to life.

    Also I know that there are issues involving the destruction of embryos when IVF is carried out, but why are they destroyed?
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    (Original post by dench_crepz)
    Do we have to kno about transpiration of water through the xylem and the sympoplast and apoplast way??
    yes we do ..
    (Original post by thegreenchildren)
    does anyone know anything about using embryos for stem cells and the ethical issues around it?

    I am scared that there will be a four mark question about this. :eek:

    I can only think of: some people believe that a genetically unique individual is created at fertilisation and that this new individual has a right to life.

    Also I know that there are issues involving the destruction of embryos when IVF is carried out, but why are they destroyed?
    there are some lovely notes on this thread about this .. look through the thread .. ithink its about page 2
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    (Original post by dench_crepz)
    Do we have to kno about transpiration of water through the xylem and the sympoplast and apoplast way??
    Yeah i think we do. I'm doing to go over it anyway cause I remember seeing a question on that in some paper.
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    (Original post by thegreenchildren)
    does anyone know anything about using embryos for stem cells and the ethical issues around it?

    I am scared that there will be a four mark question about this. :eek:

    I can only think of: some people believe that a genetically unique individual is created at fertilisation and that this new individual has a right to life.

    Also I know that there are issues involving the destruction of embryos when IVF is carried out, but why are they destroyed?
    For the use of ES cells:
    1) alleviate human suffering
    2)some people dont consider them potential babies yet as they are still at an early stage
    3)they are easy to extract and handle in the lab, and are either pluripotent or totipotent, so can differentiate into a wide range of cells

    Against:
    1)against some people's religious views
    2)pressure on woman to produce surplus babies
    3)some people believe them to be potential humans since the moment of conception
    4)difficult to police use, so may be used to clone human beings
    5)there is risk of rejection, infection and cancerous growth upon transplant which my not be worth it

    they are destroyed so that ES cells can be extracted. on the other hand ES cells can be extracted from the blastocyst at its 8-cell stage without damage to the embryo.

    i have found many definitions for ES cells, but one that guarantees u to get 3 marks is:
    unspecialised cells that keep on dividing and are totipotent, pluripotent or multipotent

    hope this helps
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    (Original post by jerichi)
    Thanks!! This is really helpful!! xo
    You're welcome x
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    Do we need to know about bacteriostatic and bactericidal??
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    (Original post by Lujain Al Omari)
    For the use of ES cells:
    1) alleviate human suffering
    2)some people dont consider them potential babies yet as they are still at an early stage
    3)they are easy to extract and handle in the lab, and are either pluripotent or totipotent, so can differentiate into a wide range of cells

    Against:
    1)against some people's religious views
    2)pressure on woman to produce surplus babies
    3)some people believe them to be potential humans since the moment of conception
    4)difficult to police use, so may be used to clone human beings
    5)there is risk of rejection, infection and cancerous growth upon transplant which my not be worth it

    they are destroyed so that ES cells can be extracted. on the other hand ES cells can be extracted from the blastocyst at its 8-cell stage without damage to the embryo.

    i have found many definitions for ES cells, but one that guarantees u to get 3 marks is:
    unspecialised cells that keep on dividing and are totipotent, pluripotent or multipotent

    hope this helps
    wow thanks so much!
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    (Original post by FareedPatel)
    Wow i wanna do dentistry or a doctor realted course at uni, have you got any advice??? ive not done much reasearch on it as i am totally focusing on my exams right now
    yeah you're doing the right thing by focusing on exams right now! but after exams, maybe consider getting some work experience done
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    (Original post by Lujain Al Omari)
    For the use of ES cells:
    1) alleviate human suffering
    2)some people dont consider them potential babies yet as they are still at an early stage
    3)they are easy to extract and handle in the lab, and are either pluripotent or totipotent, so can differentiate into a wide range of cells

    Against:
    1)against some people's religious views
    2)pressure on woman to produce surplus babies
    3)some people believe them to be potential humans since the moment of conception
    4)difficult to police use, so may be used to clone human beings
    5)there is risk of rejection, infection and cancerous growth upon transplant which my not be worth it

    they are destroyed so that ES cells can be extracted. on the other hand ES cells can be extracted from the blastocyst at its 8-cell stage without damage to the embryo.

    i have found many definitions for ES cells, but one that guarantees u to get 3 marks is:
    unspecialised cells that keep on dividing and are totipotent, pluripotent or multipotent

    hope this helps
    thanks hope this comes tomorrow ..
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    Hey guys, I'm stuck on this question I would have said that "The molecule could have side branches" would be True, because of the (1,6) glycosidic bonds that can form in amylopectin in starch... but the mark scheme says it is false. Any help as to why?

    Click image for larger version. 

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    (Original post by ummm)
    Hey guys, I'm stuck on this question I would have said that "The molecule could have side branches" would be True, because of the (1,6) glycosidic bonds that can form in amylopectin in starch... but the mark scheme says it is false. Any help as to why?

    Click image for larger version. 

Name:	weird question.jpg 
Views:	104 
Size:	28.3 KB 
ID:	149525

    my teacher said this was a very strange and badly worded question because it doesnt make clear which polysaccharide to focus on. its weird. and i got that wrong as well.
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    Can anyone explain the whole blastocyst stem cell thing?
    I know what a blastocyst is but i cant remember much else.

    Thanks in advance
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    Also another question: if they ask you to name the eukarya domain what are you going to write? I have seen that in some papers they accept eukarya and eukaryote and in others eukaryota! and in the revision guide is eukaryota. I dont know what to do because if i write eukaryota they might not accept it even though thats what the book says!
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    (Original post by thegreenchildren)
    Also another question: if they ask you to name the eukarya domain what are you going to write? I have seen that in some papers they accept eukarya and eukaryote and in others eukaryota! and in the revision guide is eukaryota. I dont know what to do because if i write eukaryota they might not accept it even though thats what the book says!
    Just write Eukarya... I'm pretty sure that is accepted every time!
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    (Original post by ummm)
    Hey guys, I'm stuck on this question I would have said that "The molecule could have side branches" would be True, because of the (1,6) glycosidic bonds that can form in amylopectin in starch... but the mark scheme says it is false. Any help as to why?

    Click image for larger version. 

Name:	weird question.jpg 
Views:	104 
Size:	28.3 KB 
ID:	149525
    the mark scheme is incorrect, my teacher told me so

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