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A level Biology: Post your doubts here!

Discussion in 'International A And AS Level' started by XPFMember, Sep 29, 2011.

  1. Sammy1234

    Sammy1234

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    I think that you're right.
     
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  3. {#}324354

    {#}324354

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    I wrote the same
     
  4. angryrider_56

    angryrider_56

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    u
    unfortunately i think i haven't understood the question too well...so no i haven't wrote that point but i wrote about osmosis and other stuff to try and increase my chances of meeting valid answers in the MS.
     
  5. angryrider_56

    angryrider_56

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    My answer was that the thing prevented the translation from happening....guys it said it was on the start codon so how can translation happen if the start codon isnt available?
     
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  6. Kanekii

    Kanekii

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    Oh i just said its longer lasting/life and used for treatment against cancer/tumour
     
  7. A*****

    A*****

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    I wrote that the small molecule had a STOP codon so the polypeptide is not synthesised as the STOP codon is encountered before the START codon...is it right?
     
  8. A*****

    A*****

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    I wrote that it marks the antigen so it is easier for the macrophage to identify and destroy it
     
  9. angryrider_56

    angryrider_56

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    same
     
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  10. fayzaan

    fayzaan

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    what do u guys think about the threshold?!
     
  11. fayzaan

    fayzaan

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    and what was the answer for the question with different pathogenic strains
     
  12. A*****

    A*****

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    Maybe around 40
     
  13. A*****

    A*****

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    Which question are u talking about?
     
  14. fayzaan

    fayzaan

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    the one with immunity
     
  15. A*****

    A*****

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    We had to mention about specificity of memory B and T cells and about the different shapes of antigens
     
  16. fayzaan

    fayzaan

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    i forgot to mention about memory cells but mentioned about the specificity of antibodies to antigens. How much marks will i lose?!
     
  17. fayzaan

    fayzaan

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    there was also a question about the features of channel protien
    what did u write in the question
     
  18. A*****

    A*****

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    1 I think
     
  19. A*****

    A*****

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    I wrote about amino acids with hydrophobic R groups facing the hydrophobic fatty acid chains so they can interact for stability and the lining of the inside with hydrophilic R groups to allow the entry and interaction with polar molecules
     
  20. fayzaan

    fayzaan

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    it a
    lt also mentioned about the total number of polypeptide chain it contains. Is it necessary to tell about quatenary structure
     
  21. A*****

    A*****

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    I don't know whether mentioning about the quaternary structure was mandatory or not...but I think that the question was to state and explain so the answer which I told u would be sufficient for 4 marks...what do u say?
     

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