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OCR Biology F212 Revision [3rd June 2013] (Now Closed) Watch

  • View Poll Results: How did you feel the F212 exam went?
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    Only a few days til the exam! How is everyone feeling about the exam and how is revision going? I've just a few things to go over from the health section Really hoping for a biological molecules heavy paper which it should be
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    (Original post by own)
    There are some called 'human health and disease' and I think 'environmental biology' they are all old specification from ~2000-->2008 so you have to be picky and see which questions are actually still relevant, but its good practice


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    okay thanks
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    (Original post by AtotheT)
    Hey dude, they're not covalently bonded. Cellulose molecules form glysocidic bonds with each other and this is an example of a condensation reaction because a water molecule is released. Also, they are joined together by hydrogen bonds because their hydroxyl groups are antiparallel. Hydrogen bonds form between the anime and carboxyl groups
    My bad, it seems I mixed cellulose with collagen
    Okay so cellulose:
    Hydrogen bonds between chains due to the projecting OH groups.
    Collagen:
    Covalent bonds (cross-links) between molecules.
    Also, cellulose molecules don't form glycosidic bonds with each other, it's the glucose monomers that do *
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    (Original post by wndms)
    Thank you!

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    What I told you was wrong, sorry
    I've edited my post.
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    (Original post by own)
    Yes they are covalently bonded, glycosidic is just the specific name for the bond. Like in DNA, the back bone is made up of phosphodiester bonds, however the bonding is actually just covalent between a phospate group and a sugar...just fancy names


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    Yeah the bonds between the monomers are covalent but I was talking about bonds between the actual chains, which in cellulose, are hydrogen bonds.
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    What structure does collagen have? Is it quaternary or just completely different structure?
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    (Original post by Minz)
    What structure does collagen have? Is it quaternary or just completely different structure?
    Quaternary
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    (Original post by Minz)
    What structure does collagen have? Is it quaternary or just completely different structure?
    What is quaternary?

    I don't understand it :'(
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    Has anyone done the January 2011 paper?
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    (Original post by Blashnet)
    What is quaternary?

    I don't understand it :'(
    It just means that the protein is made up of more than one polypeptide chain. So collagen is made up of 3 chains and haemoglobin is made up of 4.
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    (Original post by Blashnet)
    Has anyone done the January 2011 paper?
    Yes, I have
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    (Original post by Gotzz)
    Yes, I have
    how did you find it?
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    Does anybody have notes on biodiversity?
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    I really hope this paper isn't as strong on biodiversity and evolution, i struggle with that but

    Btw does nicotine cause constrictions of arterioles? Cause in the text book it says it does but i did a past paper yesterday, and it said that carbon monoxide does.

    Don't they both? or is it just CO?
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    Is phagocyte a primary defence?

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    (Original post by wndms)
    Is phagocyte a primary defence?

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    No its a secondary defence
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    (Original post by Blashnet)
    how did you find it?
    Not too bad, I got an A (73 marks)
    What about you?
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    (Original post by Gotzz)
    Not too bad, I got an A (73 marks)
    What about you?
    I thought it was the hardest past paper, a lot of ambiguous questions!

    I got 69, an A
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    (Original post by Blashnet)
    I thought it was the hardest past paper, a lot of ambiguous questions!

    I got 69, an A
    I still have two papers to go but so far my lowest marks are on January 2013 (due to no revision) and January 2010 :P
    But the grade boundaries for that paper were rather low so I guess it must have been quite difficult.
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    Is cellulose the only carbohydrate we need to know formed by Beta glucose?
 
 
 
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