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

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    (Original post by otrivine)
    No please answer This is good revision!
    Ah, sorry!
    I thought you wanted "Biogeek" to answer this specifically!


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    What is interbreeding?
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    look up the definition of apoptosis, replace "cell" with "Lizzie" and that's how I feel about Biology right now
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    What details do we need to know about allopatric and sympatric speciation (reproductive isolation mechanisms), and stabilizing disruptive and directional selection?

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    (Original post by Ché.)
    Ah, sorry!
    I thought you wanted "Biogeek" to answer this specifically!


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    No for everyone
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    (Original post by michmic)
    What is interbreeding?
    Interbreeding most commonly refers to breeding two different species within the same genus to get a hybrid
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    (Original post by otrivine)
    No please answer This is good revision!
    I am just going to say the differences in general as I don't know how I would three, 'specific' ones:

    SPECIFIC:
    - Antigen based; antigens are the main stimulation when detecting pathogens.
    - The use of cells for specialised functioning towards the immune response.
    - The antibodies are specialised per bind with the antigen more than non-specific.
    NON-SPECIFIC:
    - Innate based; the phagocytes will detect and engulf ANY pathogen in site.
    - The use of receptors as their cell signalling - mainly lipoproteins.
    - defences include the obvious skin and mucous membranes.


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    (Original post by kited4)
    Interbreeding most commonly refers to breeding two different species within the same genus to get a hybrid

    Thank you
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    (Original post by otrivine)
    Answer this biogeek


    Describe 3 differences between specific and non-specific response
    oooooh
    hmmm...

    Non specific does not involve recognizing a specific molecule.
    oooh can you tell me the answer? haha
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    I think this is right...
    Specific only involves response to an antigen whereas non-specific involves response to any foreign object and does not distinguish between different pathogens
    Specific involves B and T lymphocytes whereas non-specific involves primary defence e.g. physical barriers (skin) and mucous membranes
    Specific produces memory cells and non-specific does not

    I'm not sure but I gave it a try
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    (Original post by coco_madem0iselle)
    I think this is right...
    Specific only involves response to an antigen whereas non-specific involves response to any foreign object and does not distinguish between different pathogens
    Specific involves B and T lymphocytes whereas non-specific involves primary defence e.g. physical barriers (skin) and mucous membranes
    Specific produces memory cells and non-specific does not

    I'm not sure but I gave it a try
    I think this sounds like a good answer


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    (Original post by lauren1brown)
    I think this sounds like a good answer


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    That is definitely a more concise answer than mine!
    Thanks for sharing.


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    When the lipid content is high, the level of cholesterol is also high so there is more fat deposited under the endothelium which increases the risk of atherosclerosis due to the blockage of the lumen.

    Is this right?

    Question: Other than obesity outline why a diet high in lipids might have a negative effect on the health of an individual
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    (Original post by Danny786)
    When the lipid content is high, the level of cholesterol is also high so there is more fat deposited under the endothelium which increases the risk of atherosclerosis due to the blockage of the lumen.

    Is this right?

    Question: Other than obesity outline why a diet high in lipids might have a negative effect on the health of an individual
    Completely acceptable and correct, in my opinion.
    You might want to put the specific lipids in - LDL.
    Bt, other than that - if that - you're spot on!



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    Ok thanks..

    Does anyone know what they think the 6/8 markers will be on and does anyone know what kind of questions will come up?

    I've revised everything I want to know what I should focus on
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    (Original post by Danny786)
    Ok thanks..

    Does anyone know what they think the 6/8 markers will be on and does anyone know what kind of questions will come up?

    I've revised everything I want to know what I should focus on
    I have a horrible feeling it's going to be on different conservation methods and comparing them - I never know what to say
    However I don't think there are enough things to say to make it a 6/8 marker..hopefully
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    What is the theory of Darwin?
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    Really didn't know how to answer this and the mark scheme didn't help so much, would be grateful if anyone could help!:

    Amylase is an enzyme that hydrolyses amylose to maltose (a reducing sugar)

    Student investigates action of amylase on amylose. She mixes them and places the mixture into a water bath.

    Describe how she could measure the change in concentration of maltose (reducing sugar) as the reaction proceeds.
    (8 marks- one for spelling ect)




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    What are different methods of conservation guys? Also anybody tell me some pros and cons of Ex and In situ


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    (Original post by coco_madem0iselle)
    I have a horrible feeling it's going to be on different conservation methods and comparing them - I never know what to say
    However I don't think there are enough things to say to make it a 6/8 marker..hopefully

    Sorry what are the conservation methods??:confused:
 
 
 
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