AQA GCSE Biology Unit 3 - BLY3H - Monday 21st May 2012


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    Yo. Got the thread ready... All please feel free to post any questions/answers you can remember from the day... Thanks !!

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    http://gcserevision101.wordpress.com/biology-b3/ - Helpful website for this topic

    Good luck everyone

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    (Original post by Jaykishen)
    Yo. Got the thread ready... All please feel free to post any questions/answers you can remember from the day... Thanks !!
    Dreading this exam ><

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    DW... Trust me - Its much easier than B2.. No lie !!
    Just needa learn the stuff...

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    yeah it actually is easier than b2!

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    http://store.aqa.org.uk/qual/pdf/AQA-4411-W-SP-12.PDF
    The specification for Biology Unit 1, 2 and 3.
    VERY useful!
    Unit 3- Page 49-54.
    Learning everything on there, will guarantee you an A.

    I haven't even had a teacher for Unit 3, but I still managed to get an A in a mock I just completed by just revising everything from the specification

    Good luck!

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    what time is the exam? haha so unorganised :L

    (Original post by jermainegolley)
    what time is the exam? haha so unorganised :L
    9am, I think

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    Find biology unit 3 so hard!!
    Im cramming at the moment, can't get my head round fermenters and exponential growth and stuff :confused:
    Good luck everyone

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    Am I the only person who finds Unit 3 far harder than Unit 2?

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    I'm really confused, everywhere I go I'm getting different answers...can anyone explain to me what happens to glucose, ions and water in the body? Like, how are they absorbed into the bloodstream?

    Thanks!

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    (Original post by pokings)
    Am I the only person who finds Unit 3 far harder than Unit 2?
    Unit 3 is miles harder than unit 2, unit 2 was a doodle!
    Try some of the unit 3 past papers, half of them are "application of knowledge" questions which I can't stand...

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    (Original post by Swords N Thorns)
    I'm really confused, everywhere I go I'm getting different answers...can anyone explain to me what happens to glucose, ions and water in the body? Like, how are they absorbed into the bloodstream?

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    Is this in the kidney that your asking about?? If so....
    A healthy kidney:
    − first filtering the blood: urea, glucose, water, ions
    − reabsorbing all the glucose (via active transport)
    − reabsorbing the sufficient ions (via active transport)
    − reabsorbing the sufficient water (via osmosis)
    − reabsorbing NO urea

    So in the urine there are excess ions, excess water and urea
    Hope this helps!

    (Original post by Swords N Thorns)
    I'm really confused, everywhere I go I'm getting different answers...can anyone explain to me what happens to glucose, ions and water in the body? Like, how are they absorbed into the bloodstream?

    Thanks!
    After being filtered:

    Glucose is almost completely reabsorbed by active transport from the proximal tubules.
    Some Water is reabsorbed by the process of osmosis.
    Some Ions are reabsorbed by active transport.
    About 50% of urea is reabsorbed by passive transport (although at GCSE, I think it's OK to say that no urea is reabsorbed )

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    Good luck everybody! I think unit 3 is definetly easier than unit 2...

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    unit 2 was easy but the genetic stuff put me off
    unit 3 - i need to revise glucose stuff so basically the last chapter lol

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    I find B3 pretty simple but i always forget the production of stuff using microorganisms i.e. beer, yoghurt, biogas

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    I'm doing both tomorrow and i find B2 so much easier !! Well in B3 it's not the actual content that's hard but the type of questions they ask, well for me anyway. Just wondering, does anyone have the Jan 2012 papers for B2 or B3?

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    @James; I agree, it's the way they set the questions out.
    After looking at the past papers, they grade boundaries seem quite reasonable.

    Hopefully tomorrows paper is alright. I remember doing B2 In January, and it was completely How science works questions. Nothing really knowledge wise.

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