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

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    (Original post by OHK567)
    Primary Secondary
    Slow Fast
    Produces Symptoms No Symptoms
    Pathogens enter for the 1st time Pathogens enter for the 2nd time
    Activates B and T lymphocytes Activates Memory Cells
    Good answer. Could also mention that more antibodies are produced in the secondary and that there is a shorter delay time.
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    (Original post by OHK567)
    Define Ex Situ Conservation (2 marks)
    Conservation that takes place outside of the species natural habitat.
    (I don't know if that's enough for 2 marks? Maybe I should give an example...)
    For example, in a zoo.
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    (Original post by flygerianmc)
    em wait am so amylopectin is branched but not because of 1-6 bonds? i thought glycogen only contained 1-6's for quicker energy release. and em anyone gimme a quick run down on there structure and functions plox
    I think it is because of 1,6 bonds. It's just that starch is also made up of amylose, which is straight, so the final structure is therefore less branched than glycogen's.
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    (Original post by otrivine)
    will I not get the 4 marks, thought that was enough
    I don't really know what the mark scheme would be looking for, but it's best to write down everything you can think of to be safe
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    (Original post by Gotzz)
    Conservation that takes place outside of the species natural habitat.
    (I don't know if that's enough for 2 marks? Maybe I should give an example...)
    For example, in a zoo.
    Yeh that is 2 marks the main thing to put down is outside the species' natural habitat
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    (Original post by Gotzz)
    I don't really know what the mark scheme would be looking for, but it's best to write down everything you can think of to be safe
    oh ok


    Describe why kidneys cannot retain high concentration of glucose (3)
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    (Original post by otrivine)
    oh ok


    Describe why kidneys cannot retain high concentration of glucose (3)
    Wow that's kinda hard.
    Because glucose is soluble so it is constantly being used in respiration?
    I have no idea
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    (Original post by Gotzz)
    Wow that's kinda hard.
    Because glucose is soluble so it is constantly being used in respiration?
    I have no idea
    Because there is a high concentration of glucose, the glucose cannot be held in the kidney and so is excreted out of the body in the form of urine and so leads to an indication if person is diabetic

    my turn
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    I don't believe non-reducing sugars tests have come up, anyone?


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    (Original post by otrivine)
    Because there is a high concentration of glucose, the glucose cannot be held in the kidney and so is excreted out of the body in the form of urine and so leads to an indication if person is diabetic

    my turn
    Are we meant to know that? :eek:
    Describe an experiment to measure the change in concentration of a reducing sugar. (7)
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    (Original post by own)
    I don't believe non-reducing sugars tests have come up, anyone?


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    June 2012, Q4dii
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    What is Passive artificial immunity? It says you get injection with antibodies but that's clearly active...

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    (Original post by Gotzz)
    Are we meant to know that? :eek:
    Describe an experiment to measure the change in concentration of a reducing sugar. (7)
    but about kidney is A2 stuff
    so you didnt need to know it to get the marks but it may be on the markscheme
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    (Original post by Gotzz)
    Are we meant to know that? :eek:
    Describe an experiment to measure the change in concentration of a reducing sugar. (7)
    We aren't meant to know that :P thats F214 an A2 question
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    (Original post by MedMed12)
    but about kidney is A2 stuff
    so you didnt need to know it to get the marks but it may be on the markscheme
    (Original post by Munrot07)
    We aren't meant to know that :P thats F214 an A2 question
    Good, got all panicky
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    (Original post by Gotzz)
    Are we meant to know that? :eek:
    Describe an experiment to measure the change in concentration of a reducing sugar. (7)
    -set up 5 soloutions each with different concentrations of glucose.(2,4,6,8,10 mMol per dm^3)
    -each soloutions should have the same volume of glucose and same volume of Benedicts soloution.
    -have excess Benedicts soloution
    -Add all 5 soloutions to a water bath at 80 degrees and keep them in there for 10 mins
    -soloution will change from blue to red with reducing sugars
    -remove the soloutions and filter out the precipitate
    -then add each soloution into a colorimeter and measure the transmission
    -measure transmission of water as a contrast
    -a greater transmission means a greater concentration of reducing sugar.
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    (Original post by Gotzz)
    June 2012, Q4dii
    Oh, shame more unlikely now, but its a easy question for a lot of marks xD


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    (Original post by wndms)
    What is Passive artificial immunity? It says you get injection with antibodies but that's clearly active...

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    Passive artificial is injection of antibodies.
    Remember that active is always when the body makes the antibodies itself, due to an activation of the immune response.
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    (Original post by otrivine)
    will I not get the 4 marks, thought that was enough
    Also you can't mention anything about day 31, you have no idea what day the secondary response will occur, what if the person isn't infected again for 50 days after the original infection
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    (Original post by wndms)
    What is Passive artificial immunity? It says you get injection with antibodies but that's clearly active...

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    To be active the immune system has to be involved (activated), injecting antibodies does not activate the immune system
 
 
 
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