AQA BIOL1 Biology Unit 1 Exam - 16th May 2011

I'm only absolutely sure about one mark that I have lost which is the buffer one (so frustrated that I overlooked it... I guess I was a bit slack on that area of revision, been doing heart, lungs and immunity mostly) otherwise I can't pinpoint anything else. Although I've probably lost a handful more around... Just a critical guess... 6 - 7 marks in total lost?

Chlamydia?
Atheroma is caused by LDLs(or cholerstoral) (1) in artery wall (1);
Atheroma linked to thombosis (1)
Coronary artery blocked (1)
means no oxygen can reach heart muscle(1)
heart muscle cannot respire/dies(1) (MAX 3??)
Antigen
protein (1) which causes a stimulation in antibodies/causes an immune response(1)
Why it attacks muscles
Similar antigens(1)
are COMPLEMENTARY (to muscles). REJECT: same

Evaluate:
Yes - memory cells produced (1), so when pathogen invades again, much faster stimulation in antibodies (1) long term immunity?
No - done on mice? - cant generalise (1) - memory cells (1)will attack the muscle(1), sample size unknown (?!??!) (1), side effects (1), antigenic variability (1) - pathogen may mutate, and form new strains(1)
max 3.
/10

http://www.thestudentroom.co.uk/showthread.php?t=1643032

markscheme!

cheers for the link, 43 for an A , hmmmmm if thats what it turns out to be like, i might just have salvaged an A, but lets wait and see, hopefully i get an A in BIOL2 and then smack the chemistry edexcel exams ill be happy

would anyone be able to upload the paper online wid a copy of answers they think fits
would be realli helpful
ma teacher has a copy buh she wouldnt let us see it
she keeps sayin wots dun is dun jus revise for ur others nw

4. Lungs?;
Why breathing out? Decrease in tidal volume of lungs (1);
Calculation (2); 1.4? (got that wrong), 1 mark for principle (dividing vol/time);
Emphsema: not as much air breathed out as person A as the decrease in volume of lungs is less, (due to loss of elasticity) (MAX 1);
Alveoli walls break down/walls THICKEN(1), reduces surface area (1)
Loss of Elastin/ Loss of elasticity (so can't recoil/deflate fully) (1); reduces concentration/diffusion gradient (1) (MAX 4)

/7

1.4 was correct

http://www.thestudentroom.co.uk/show....php?t=1643032

That is an unofficial mark scheme.

Your teacher does have a point all you can do now is revise for your next unit 2 bio exam.

can u add it as an attchment here cuz wen i try to click on the like it doesnt seem to be working
n tnx soo much for the link

just wondering about that vaccine QU - im pretty sure that the antigen is similar to the mices' heart muscle antigens and thus the antibodies created would therefore attack the heart muscle. So i didnt put that it would attack the human heart in the evaluation because it only stated it was the similar to the antigen for mice and not humans.

http://www.thestudentroom.co.uk/showthread.php?t=1643032

markscheme!

yes . what do you think you've got then?