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AQA BIOL2 Biology Unit 2 Exam - 26th May 2011 Watch

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    (Original post by failingatm)
    Hopefully we're right! I didn't know what it meant by selection tho :indiff:
    yeah me neither, but maybe we'll get at least some marks? :3
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    (Original post by ScheduleII)
    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 also talked about large proteins which remain in blood that decreases the water potential
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    (Original post by sablarrr)
    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
    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.
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    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 >_>
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    I have lost 20 marks minimum! Nightmare!
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    (Original post by NutterFrutter)
    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.
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    (Original post by Digg93)
    Doesn't each strand have to add up to 100? That's what I read in a past paper.
    Each strand has to add up to 74, 148 in total. It's not percentages.
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    (Original post by JSLCampbell)
    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 >_>
    I put insoluble so doesn't draw excess water in by osmosis, as the pond is freshwater with a high WP

    and hey
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    (Original post by JSLCampbell)
    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 >_>
    i guess it's got sth to do with the fresh water of the pond, so i put down "no osmotic effect"
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    (Original post by Digg93)
    Doesn't each strand have to add up to 100? That's what I read in a past paper.
    No the question said it was 74.....
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    (Original post by EffKayy)
    probs 58.
    sup with your username?!
    58, thats high...

    n its the exam which caused me to join tsr :P Lol, its for lols really tbh.
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    (Original post by SittingOnCornflakes)
    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.

    Yeah I could have done with 10 more mins, I mean i finished the paper but would have liked to have checked.

    Haha, the mass junk food consumption sounds like a plan, although it goes totally against what we learnt in unit 1 haha.
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    (Original post by ChessMister)
    I put insoluble so doesn't draw excess water in by osmosis, as the pond is freshwater with a high WP

    and hey
    hmm i didn't mention the bit because i thought the mark scheme will be:

    insoluble - 1
    no osmotic effect - 1
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    (Original post by JSLCampbell)

    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 >_>
    I put the starch is insoluble, so no osmotic effects, so no water enters/leaves the cell causing it to shrivel/burst.
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    did anyone else mention lugworms having LUNGS for oxygen association at low partial pressures?!!! ****ed up and for the bit about methicillin resistance or whatever, apprently it was due to a 'competitive inhibitor' worst examm :|
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    (Original post by Rocketeeer)
    i also talked about large proteins which remain in blood that decreases the water potential
    Yay me too!
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    (Original post by Rocketeeer)
    hmm i didn't mention the bit because i thought the mark scheme will be:

    insoluble - 1
    no osmotic effect - 1
    yeh it will be; I get paranoid and write a dissertation for every question
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    What did people actually put for what is genetic diversity? I know its simple but i got stuck on that I never found a good way to phrase it.
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    (Original post by katieeeeeee)
    did anyone else mention lugworms having LUNGS for oxygen association at low partial pressures?!!! ****ed up and for the bit about methicillin resistance or whatever, apprently it was due to a 'competitive inhibitor' worst examm :|
    In markschemes you normally have to say:

    -Lower partial pressure of 02 in the lungs
    -Haemoglobin has a higher affinity for oxygen, at this lower partial pressure
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    (Original post by liviaaa)
    I put the starch is insoluble, so no osmotic effects, so no water enters/leaves the cell causing it to shrivel/burst.
    Bugger

    I've never learnt anything related to that, and I wrote out the whole syllabus in notes >_>
 
 
 
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