AQA BIOL2 Biology Unit 2 Exam - 26th May 2011

Dont worry about it!
it was only two marks and a lot of people will have stuffed up the calculations.
You can always retake it like i've just done, so no worries

for the frogs egss questions, could you say anything about eutrophication to get marks??

what do you guys think grade boundaries will be for A?

the answer was 55.6% and strand a and b had each 74 bases

grade boundaries will probz be about 58 for an A from experience

loved the enzyle Qs guys

omg really? thats what i wrote about but i thought it would be wrong!

Hopefully we're right! I didn't know what it meant by selection tho

I've also got AQA CHEM2 tomorrow.
I got 9.1 and 14 for the Wales MRSA and something like 53.8% for the percentage increase.
I mentioned antibiotic presence exerting a selection pressure, resistant bacteria surviving and reproducing and the proportion of bacteria with resistance increasing due to natural selection, vertical gene transmission in division and horizontal transmission by one bacterium forming a conjugation tube, the plasmid being replicated and made linear, and the allele for resistance being passed on. I then said that this could cause different species of bacteria to develop resistance.
I talked about osmosis at the venous end of the capillary causing reabsorption from tissue fluid and drainage of excess fluid into lymph vessels which empty into two ducts close to the heart.
I got diagonal values for strand A and B because it was complementary strands, not the percentage of organic base in the DNA as a whole molecule in which case A=T and C=G.

I was pushed for time! I could have done with another 10 minutes to check my answers tbh.

I'm not looking forward to results day

Strand A: 19 26 9 20
Strand B: 26 19 20 9

They weren't possibly in that order but that's the answer, A is 20.

Doesn't each strand have to add up to 100? That's what I read in a past paper.

Hey

Btw, what did people put for the reason why Carbohydrate would be a good storage source in water? I said that it was insoluble in water and so wouldn't pass through the cell membrane and be lost, but that was really a stabby answer; I skipped it and it was literally the last question I did right at the end >_>

Doesn't each strand have to add up to 100? That's what I read in a past paper.

Hey

I'm a little bit nervous. I know I was strong for about 70% of the paper but I really needed the loo towards the end. At that point onwards I was compulsively answering the questions. I think I got most of them okay but I have a weird feeling now that I misread some questions through lack of concentration -.- It didn't help that that part of the paper had a lot of HSW stuff about Synthetic EPO.

I didn't get the percentage increase either, that's the only question I missed.


Btw, what did people put for the reason why Carbohydrate would be a good storage source in water? I said that it was insoluble in water and so wouldn't pass through the cell membrane and be lost, but that was really a stabby answer; I skipped it and it was literally the last question I did right at the end >_>

probs 58.
sup with your username?!

Grade boundaries are usually low for this unit so you never know, results day might turn out better than expected!

Anyway, good luck if you have any more exams.
I'm off to partake in some mass junk food consumption.