# Edexcel a2 biology revision for the may/june 2012 exam :)

Biology exam discussion - share revision tips in preparation for GCSE, A Level and other biology exams and discuss how they went afterwards.

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1. Re: Edexcel a2 biology revision for the may/june 2012 exam :)
(Original post by Rainbow_2010)
Hey its pretty simple, basically u just have to remember to take away the energy that the plants use from the GPP value given at 24.4,
24.4 x 10^6 - 3.7 x 10 ^6 that gives ur NPP
and then u calculate the perecentage by 2.07 x ^6 / 24.4 x 10^6 = ans x 100= 84.9%
Hope that helps
Yh I got it earlier thanks!
Btw it's 20.7
2. Re: Edexcel a2 biology revision for the may/june 2012 exam :)
I don't understand this one part in the humoral response. When the antigens of the bacterium attach to the B cell, what happens to it? Is it engulfed and the antigens are expressed on the cell surface membrane or do the antigens just bind to the receptors of the cell surface membrane? :/
3. Re: Edexcel a2 biology revision for the may/june 2012 exam :)
(Original post by verdikt)
I don't understand this one part in the humoral response. When the antigens of the bacterium attach to the B cell, what happens to it? Is it engulfed and the antigens are expressed on the cell surface membrane or do the antigens just bind to the receptors of the cell surface membrane? :/
Check out this link.. I wrote a post on humoral response & cell mediated response.. might help you:-)

http://www.thestudentroom.co.uk/show....php?t=1950350

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4. Re: Edexcel a2 biology revision for the may/june 2012 exam :)
Can someone please briefly the spirometer practical to me?? what would i write for a response to them 6marker practical questions?? Any links to videos/websites would be helpfull azwell! thanks
5. Re: Edexcel a2 biology revision for the may/june 2012 exam :)
(Original post by Hanz_a93)
Can someone please briefly the spirometer practical to me?? what would i write for a response to them 6marker practical questions?? Any links to videos/websites would be helpfull azwell! thanks
Post it on this thread: http://www.thestudentroom.co.uk/show...005162&page=21

I think this is now the main thread for the exam on Friday
6. Re: Edexcel a2 biology revision for the may/june 2012 exam :)
sorry for scraping in this thread, but i'm doing A2 in biology now, and no one has said anything about an article !!
7. Edexcel a2 biology revision for the may/june 2012 exam :)
(Original post by hazel43)
sorry for scraping in this thread, but i'm doing A2 in biology now, and no one has said anything about an article !!
Article is in the unit 5 exam, don't worry about it for now. It comes out in March.

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Last updated: October 17, 2012
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