Edexcel Biology Salters Nuffield A Level Paper 3 17th June 2019 Unofficial Markscheme

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Lizzi Burford
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How did everyone find the test and what were your answers for the calculation question?
For the article questions,
Stem cells are undifferentiated cells (totipotent before the blastula stage and pluripotent afterwards)
I got ethical issues with the embryonic stem cell research as removal of the potential for life and potential to feel pain after 14 days
Gastruloids are different from organoids as they're still in the embryonic stage
The tissues are likely to be rejected from the patient due to the immune response because the t-cells recognise the foreign antigens on the surface of the tissue and this stimulates the immune response
iPSCs are less likely to be rejected as they are the original tissue from the patient therefore the antigens aren't foreign
Last edited by Lizzi Burford; 1 year ago
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bigbadger
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Yeah the article section wasn’t too bad. I struggled with a lot of the rest.
Fish was alright as well
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bigbadger
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I remember getting 48 or 49% for one of the calculations
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mudmuggleblood
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I got 49% for the percentage increase of the cross sectional area
(Original post by bigbadger)
I remember getting 48 or 49% for one of the calculations
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Harrow Plug
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what did u guys put for the statistical test to see if there was a difference?
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Harrow Plug
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what did u get for the first question the heart rate calculation
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Harrow Plug
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and also why does the breathing rate increase at the START of the exericse what did u guys put
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mudmuggleblood
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T test

(Original post by Harrow Plug)
what did u guys put for the statistical test to see if there was a difference?
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anonymoussse
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i got 60secs per min

for o2 consumption I got 1.5dm3/20secs (I don't know what that equals to lol)
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solark
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Why did i get 96% for the area?
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anonymoussse
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I mean 60 beats per min
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Harrow Plug
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i think 96% is correct mate
(Original post by solark)
Why did i get 96% for the area?
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anonymoussse
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I think I got an A for bio. I wouldn't be surprised with a B because I was distracted
I think I will get a B for chem. mistakes and stuff
I think I got an A for psychology

whatever I get i'll be beyond proud of myself and happy. I've worked so hard and long.

even if I get ccc< I don't think those grades will reflect my hardwork and knowledge of my subjects and mark scheme answers
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Harrow Plug
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96% is correct
(Original post by solark)
Why did i get 96% for the area?
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Harrow Plug
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lol i put spearmans rank cuz its random sampling
(Original post by mudmuggleblood)
T test
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jimmy432
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(Original post by Harrow Plug)
i think 96% is correct mate
I got 96% aswell. Diameter was 22mm => radius = 22/2 = 11mm and therefore Cross-sectional area = 121xpi

([121pi - original area]/original area) x 100 = 96.3% (3sf)

edit: iirc the orginal area was 193.6mm^2
Last edited by jimmy432; 1 year ago
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kishan2257
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What did everyone write for the 9 marker
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jimmy432
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nothing bc i ran out of time-
left 9 marker till the end but only managed to get 30s-1min to do it ; wrote 1-2 points down but will probs get 0 marks :/
(Original post by kishan2257)
What did everyone write for the 9 marker
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solark
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How mutations on transcription factors will silence genes and change the genome hence change allele frequency in gene pools? Pure waffle
(Original post by kishan2257)
What did everyone write for the 9 marker
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Sally577
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9 marker made me wanna cry ffs
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