AQA BIOL5 Biology Unit 5 Exam - 22nd June 2011

is everything else wrong then?

con someone run through all the answers for the IAA / NAA question
and the pupa question thanks
i think i got zero marks in these 2 lol and restriction mapping.

i did too! i think. actually ended up guessing 75% of the paper!

will anyone be doing an unofficial ms?

what did people put for the electrophoresis question, i put that they can predict the number of bases by electrophoresis as the dna fragments move according to size, and they can compare these with known size fragments alongside, did eni1 else write something like that

I didn't think the exam was that bad. The questions themselves were rubbish, and I hated how they generally gave you all the knowledge you were meant to learn then it was all suggest (like siRNA). But the exam itself wasn't hard, I don't think (we'll see on results day!). I did the DNA essay. Wrote about DNA replication, PCR, gene probes, recombinant DNA, gene therapy, genetically modified plants, genetic fingerprinting for both in crime and to see how closely related people were, gel electrophoresis (but very briefly, thought it didn't really do much in science and tech and it's used in genetic fingerprinting anyway), treatment of cancer and for extra knowledge mitochondrial DNA.

anyone

for the cylces i wrote
cardiac
krebs
calvin
predprey
nitrogen]
carbon
oestrous
cell cyle
muscle cont
homeostasis
in detail
9pages
but nothing outside the syllabus
can i still get 25 marks
ireally need toas i completely failed the questions
only the essay can save me now as i need an a overall

There is almost a 0% chance that you will get >22 marks.
The examiners are told to make it so that roughly 15% of the candidates get above 12 marks for scientific content, if you made no more than one mistake; then you could maybe get 14. 3 for breadth, usually they give 2 for both relevance and QWC and as you have so much I'd expect that. So probably at the most 20-22, hope that helped

you know the question about the behaviour of the lupas or whatever they were,
was it just asking about kineses and how that results in them having a greater chance of returning to an environ (in this case, lower temp) with more favourable characteristics??

Yes That was helpful

I completed the seemingly less popular Cycles question. I wrote about 5 and a half pages and discussed the following in great detail

- Oestrogen cycle

- Cardiac Cycle - (including Blood V adaptations, names of valves, tissue fliud etc...)

- Recycling of tRNA through Translation

- Muscle contraction - also the cyclling of Atp within this

- The transmission on a cholinergenic synapse (linked with muscles) focussing on the recycling of acetyl choline

- The Nitrogen cycle

- A brief outline of the neurone reflex (i.e. - receptor, sesnory neurone etc...)



I was just wonder what your thoughts were on the breadth and scientific content? I produced a detailed and lengthy account incorporating various aspects from all reached of the syllabus - even those less obvious, but all the more crucial ones :P

Thanks

Hi, to get an A overall for biology, I would need to get 53/100 raw marks or 92/140 UMS. This is based on the grade boundaries from the June 2010 paper. However, are the UMS marks always the same? For example, will 53 raw marks always be 92 UMS or can the amount of UMS marks for each raw mark increase? :/

for the sexual reproduction question,
i think meiosis was key
so i think you were a bit too basic but its AQA so you could still get the marks
don't know if its right but i talked about independent segregation and crossing over of chromatids producing diffrent combinations of alleles so different characteristics so more variability

don't stress yourself out though - all the people on here don't represent all people who took the exam