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

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    (Original post by Ché.)
    Yes, yes!
    I am up for it...



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    Define the term antigen (2)
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    (Original post by BioGeek)
    Define the term antigen (2)
    Antigen:
    "A toxin or other foreign substance on the surface of the cell that activates an immune response in the body producing antibodies."


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    For antigens can't you just say ''molecules that stimulate an an immune response''
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    Can some explain species evenness

    As in the ey things we need to know
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    Any1 up for revision?


    (Original post by Danny786)
    For antigens can't you just say ''molecules that stimulate an an immune response''
    Nope,

    A good answer is, a protein molecule which in on the surface of a pathogen which stimulates an immune response.

    (Original post by Ché.)
    Antigen:
    "A toxin or other foreign substance on the surface of the cell that activates an immune response in the body producing antibodies."

    2/2

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    (Original post by BioGeek)
    Any1 up for revision?
    i am
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    (Original post by Danny786)
    For antigens can't you just say ''molecules that stimulate an an immune response''
    That absolutely correct!
    However... For the full two marks, you might need to include more of the topic-specific vocabulary - surface, the production of antibodies as that's its function really.
    I have a thing where I write in full sentences almost all the time; since my discovery the QWC marks, I always have!
    Marks count!
    LOL.


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    Ask me a question please
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    (Original post by BioGeek)
    Any1 up for revision?




    Nope,

    A good answer is, a protein molecule which in on the surface of a pathogen which stimulates an immune response.
    I have one for you guys...
    Get your long answer heads on!

    "One of the symptoms of smoking is the development of a smokers cough.
    Explain how smoking causes a smoker's cough AND how the cough itself can lead to further problems with the lungs over a long period of time. (7)."


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    (Original post by BioGeek)
    Ask me a question please
    "Describe the role of memory cells when the Influenza virus enters the body."
    (3).


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    [QUOTE=Ché.;42902822][QUOTE=ssflcb;42902529]
    (Original post by Ché.)

    Haha!
    Thank you very much for your comment.
    I will just have to brace myself then... And go for it!
    How are you finding your preparation?
    Any further tips that you could share with me!?



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    Haha its fine . Today i just revised the whole topic, did a past paper that i did ages ago , so helps me learn and yeh look through all the past apers i have done and have chemistry aswell s You ?
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    (Original post by BioGeek)
    Ask me a question please
    Explain how smoking can lead to thrombosis or a Stroke. (6 marks)
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    (Original post by Ché.)
    "Describe the role of memory cells when the Influenza virus enters the body."
    (3).

    .


    Posted from TSR Mobile
    Memory cells circulate in the blood.
    Memory cells provide immunological memory to a particular antigen.
    Memory cells can differentiate into plasma cells to secrete antibodies

    (Original post by the A* guy)
    Explain how smoking can lead to thrombosis or a Stroke. (6 marks)
    Smoking contains nicotine.
    Nicotine causes platelets to become sticky.
    If the membrane that covers the plaque is damaged
    Red blood cells begin to stick to the exposed fatty deposits
    A blood clot then forms and is known as thrombus.
    This constricts the lumen of the artery.
    This reduces the oxygen uptake in the blood.
    Less oxygen is received at the brain.
    Which causes a stroke.
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    (Original post by the A* guy)
    Explain how smoking can lead to thrombosis or a Stroke. (6 marks)
    Can you post the model answer to that question please?
    Thanks
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    How much do I need for A if i got C in unit 1 abd 39/40 for practical

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    (Original post by Ché.)
    I have one for you guys...
    Get your long answer heads on!

    "One of the symptoms of smoking is the development of a smokers cough.
    Explain how smoking causes a smoker's cough AND how the cough itself can lead to further problems with the lungs over a long period of time. (7)."


    Posted from TSR Mobile

    Smoking contains tar.
    Tar accumulates in the trachea.
    Paralyses the cilia.
    Cilia can no longer waft mucus out of the trachea.
    Goblet cells over produce mucus.
    Mucus accumulates in the trachea.
    This provides opportunistic infections to occur.
    As it provides optimum conditions for bacteria grow.
    This is known as chronic bronchitis.


    Over secretion of mucus also causes...
    triggers an immune response.
    This leads to a neutrophil
    secreting an enzyme known as elastase.
    This digests the elastic fibers surrounding the alevoli
    Alveolar can longer recoil back during expiration.
    Causes them to burst
    Reduced surface area.
    Shortness of breath.
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    (Original post by Ché.)
    "Describe the role of memory cells when the Influenza virus enters the body."
    (3).


    Posted from TSR Mobile


    Memory cells (specifically the B memory cells) release antibodies, the memory cells circulate around the whole body in blood , in order for the antibodies to attach to the antigen of the virus to prevent the pathogen from entering the host cell. More antibodies make causes the secondary response , as more antibodies are made.
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    I got 70 ums for f211 and 34/40 for the practical, could anyone help me find out what raw marks I need for an A or a B please
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    (Original post by BioGeek)
    Define the term antigen (2)
    Antigen are molecules that are found on the cell surface of the pathogen that cause the specific disease.
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    (Original post by BioGeek)
    Can you post the model answer to that question please?
    Thanks
    what you said is the model answer.
 
 
 
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