AQA BIOL1 Biology Unit 1 Exam - 16th May 2011

I'm not sure where but my sister's friend had a really big mess up of an exam and nearly everyone did so they discounted the question or something? Was either Jan or Jun 2010. Maybe 2009 probably 2010.

EDIT: January 2010
EDIT2: Was unit 4 :/

Yes i got all of that That's right.

isit allright to talk about carrier proteins and protein channel for the 6 mark question

oh i'm so stressed over this exam, can anyone clarify if my answers are right?

fistly i know i messed up on the heart, and ALL the calculation questions...

1. for the emphysema i wrote about
- thicker alveoli walls, so longer diffusion pathway
- not much elastin so lungs can't expell air easily, making it harder to inhale air and therefore less diffusion.
- small surface area due to thicker alveoli walls

2. for the first and secon question i got hydrolysis and glucose

3. for the phagocyte question i got:
- phagocyte attracted to pathogen
- phagogcyte attatches and engulfs the pathogen
- vesicle forme
- lysocomes produce lytic enzymes to break down the pathogen
- absorbed into cytoplasm

4. for the pH question to maintain it i put that you should use a buffer solution

5. for the last questoon on absorbtion i totally freaked out, but i put
- microvilli increases surface area
- Contain mitochondria so there is ATP for active transport
(i hardly got any points for that last one )

6. for the lactose intoleance : water potention in the lumen is lower so osmosis occurs causing diarrhoea :/

im stressed!

It is but the time starts at 0.0 seconds. 0.0 - 0.1, 0.1 - 0.2, 0.2 - 0.3, 0.3 - 0.4, 0.4 - 0.5, 0.5 - 0.6, 0.6 - 0.7. So it's seven intervals so 0.7 seconds. (then 0.7 - 0.8 is the new cycle, same as 0.0 - 0.1)

That happens rarely though.

NOT HAVING A GO HERE but their objective is not the 'catch you out'. Their objective is to differentiate the candidates who have done proper hardcore revision and know all the info and how to apply it from the candidates who just skimmed over the subjects. In all honesty though, I have for suuuure failed this!

what did everyone write for the atheroma question?

yes that will get you 2 marks if qualified with a back up statement.

wasnt 1.4 haha it asked for average

isit allright to talk about carrier proteins and protein channel for the 6 mark question

85.7 beats per minute, you cant round up, since there aren't half heart beats. 85 sucessfull heartbeats were completed.

i wrote about how it's a build up of cholesterol in the artery wall and how it can lead to a blockage which leads to higher blood pressure and stops oxygen reaching the heart via the corany artery and this causes a heart attack
not sure if thats right though

Yeah did you link it to active transport and mitochondria?

i wrote buffered zone instead of buffered solution! does that even matter?

Whats the max i can get if talking about villi, as i wrote everything in nelson thornas book about it

increas surface area for diffusion
thin walled - reduce distance over which diffusion takes placerich with netweork of blood capillies - as they are supplied with it - so blood carries away absorbed glucose molecules - maintain diffusion gradient
can move - maintain diffusion gradient
then about microvilli.

|: please give me some hope