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

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    (Original post by wndms)
    What kind of disease can we relate the hormone adrenaline? Explanation please..?!

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    You could talk about atherosclerosis
    Nicotine in cigarettes causes the body to increase adrenaline levels. This increases blood pressure and heart rate meaning there is more likely to be damage to artery walls. Leading to atherosclerosis


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    (Original post by LaughingGas)
    Nice answer! Full marks!
    Thank you very much!



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    (Original post by MrMeep2580)
    Define Taxonomy and Phylogeny? (3 Marks)
    Taxonomy: It's the study of the principles of classification and the difference between species
    phylogeny: It's the study of evolutionary history of species using an evolutionary tree diagram
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    (Original post by Gotzz)
    Recognise the virus
    Produce a clone
    Can form plasma cells on infection, which make antibodies
    They are responsible for the secondary response.
    Omg...wait- how did you know LOL. Cause it says in the book that it produces immunological response but doesn't explain how etc...I'm guessing you did the past paper for this question already haha
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    (Original post by cookiess)
    Omg...wait- how did you know LOL. Cause it says in the book that it produces immunological response but doesn't explain how etc...I'm guessing you did the past paper for this question already haha
    Lmao, yeah I've done the past paper
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    What do we need to know about allopatric and sympatric speciation - and stabalising, disruptive and directional selection?
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    Have I got this right.. the difference between T and B lympthocytes are T cells mature in the thymus gland and respond to the bodies own infected cells. B cells mature in the bone marrow and respond to foreign pathogenic cells?
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    (Original post by kited4)
    What do we need to know about allopatric and sympatric speciation - and stabalising, disruptive and directional selection?
    Allopatric: It's speciation which is a result of geographical seperation e.g. what happened on the galapogas island. For example if there are two groups of the same species living on different islands, they are unlikely to breed
    Sympatric: It's speciation which is not a result of geographical seperation. This speciation can be behavioural e.g. a courtship dance is not recognised; it can be biochemical e.g. species cannot fertilise the egg
    Directional selection: It's a selection pressure- it's a external pressure that drives evolution in a particular direction
    And the others I haven't heard of O_O
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    (Original post by lauren1brown)
    You could talk about atherosclerosis
    Nicotine in cigarettes causes the body to increase adrenaline levels. This increases blood pressure and heart rate meaning there is more likely to be damage to artery walls. Leading to atherosclerosis


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    Thank you!

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    (Original post by kited4)
    What do we need to know about allopatric and sympatric speciation - and stabalising, disruptive and directional selection?
    I know about these, I think you need to know how they cause speciation (geographical or reproductive barriers etc)
    Directional is due to selection pressures, drive evolution in a certain direction.

    I've never heard of the others and I've done all the past papers more than once...so that scares me
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    (Original post by cookiess)
    Allopatric: It's speciation which is a result of geographical seperation e.g. what happened on the galapogas island. For example if there are two groups of the same species living on different islands, they are unlikely to breed
    Sympatric: It's speciation which is not a result of geographical seperation. This speciation can be behavioural e.g. a courtship dance is not recognised; it can be biochemical e.g. species cannot fertilise the egg
    Directional selection: It's a selection pressure- it's a external pressure that drives evolution in a particular direction
    And the others I haven't heard of O_O
    Thanks
    my teacher taught us that- and he has a terrible habit of not teaching us stuff that we actually need to know and spending ages on pointless stuff to the extent where we had to self teach most of food and health!

    i guess we dont need to know it - thanks guys
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    "Explain how biodiversity may be considered at different levels:habitat, species and genetic"
    This is what it says inthe specification, can anybody help me what we are supposed to say? :/

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    (Original post by wndms)
    "Explain how biodiversity may be considered at different levels:habitat, species and genetic"
    This is what it says inthe specification, can anybody help me what we are supposed to say? :/

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    Oh!
    This is the first paper of the Biodiversity specification...
    It is much more simpler than it sounds!
    It is talking about the different forms of variety in living organisms..

    I'll take a picture!

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    (Original post by wndms)
    "Explain how biodiversity may be considered at different levels:habitat, species and genetic"
    This is what it says inthe specification, can anybody help me what we are supposed to say? :/

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    Habitat - The range of habitats in which different species live
    species - the number of different species
    genetic - genetic variation between individuals within a species
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    (Original post by wndms)
    "Explain how biodiversity may be considered at different levels:habitat, species and genetic"
    This is what it says inthe specification, can anybody help me what we are supposed to say? :/

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    Here!



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    (Original post by otrivine)
    Yes, those the ones I said was the answer, but for you is fine! Use your A2 knowledge as well then the examiners would be very impressed with the quality of your answers
    :P aha I will do, so worried we might get a occurrence of last June
    aiming for full UMS this time-will save me stress on F215
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    Ah thank you!

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    (Original post by kited4)
    What do we need to know about allopatric and sympatric speciation - and stabalising, disruptive and directional selection?



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    (Original post by g.k.galloway)
    I know about these, I think you need to know how they cause speciation (geographical or reproductive barriers etc)
    Directional is due to selection pressures, drive evolution in a certain direction.

    I've never heard of the others and I've done all the past papers more than once...so that scares me
    see above
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    (Original post by MedMed12)
    see above
    Great thanks It always worries me when people starting saying words i've never heard of!
 
 
 
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