EDEXCEL Biology Unit 2 6BIO2 21st May 2012

Here are my notes for Cells and Plants and the core practicals..

http://www.scribd.com/doc/48506933/AS-Edexcel-Biology-Core-Practical-Summary

does anyone have the grade boundaries for the past papers?

Do we have to kno about transpiration of water through the xylem and the sympoplast and apoplast way??

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.

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?

Do we have to kno about transpiration of water through the xylem and the sympoplast and apoplast way??

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.

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?

Thanks!! This is really helpful!! xo

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 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

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

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?

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!

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?