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  1. joanna omar

    A level Biology: Post your doubts here!

    A change in a DnA or amino acid sequence leads to mutations.....Expalin then base subtituation of sickle cell anemia where T changes to A * take comprative fig of the amino acid from diagram ANd this mutation it could lead to altering the functin of protein and whole polypeptide changes
  2. joanna omar

    A level Biology: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s11_qp_23.pdf I don't understand Q 4 b (ii)
  3. joanna omar

    A level Biology: Post your doubts here!

    1.they have many antigens 2.eukarayote have many different satges of life cylce 3.mutation changes antgens 4.Parasite only vulurnable at certain stage of life cycle
  4. joanna omar

    A level Biology: Post your doubts here!

    sorry Q3 c(ii)
  5. joanna omar

    A level Biology: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w08_qp_2.pdf Anyone Q 3 c (iii) how 64 codes for 20 a.a ?
  6. joanna omar

    A level Biology: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w07_qp_2.pdf help me out in Q2 b (ii) ANd why in (c) the graph is on the right ?
  7. joanna omar

    A level Biology: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s07_qp_2.pdf Anyone Q3(b) please :)
  8. joanna omar

    A level Biology: Post your doubts here!

    HOOWW but isn't the same Q as in this year Q1 (C) ??? http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s05_qp_2.pdf
  9. joanna omar

    A level Biology: Post your doubts here!

    well that's better more detailed (y)(y):p
  10. joanna omar

    A level Biology: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s06_qp_2.pdf Help me out in Q5 (a)
  11. joanna omar

    A level Biology: Post your doubts here!

    To ensure cells are gentically same having same gentic material as parents To avoid any mutation occuring
  12. joanna omar

    Duas

    Thanks aloot ...jazaki allah :) sara kamal....
  13. joanna omar

    A level Biology: Post your doubts here!

    thanks but in M.s they say vital capcity is the volume of air that can be exchanged during one breath in and out I guess u have said all abt inspiratory reserve volume ! I still don't understand difference !
  14. joanna omar

    A level Biology: Post your doubts here!

    Cholera: 1)Poor sanitation 2)Malnutrition 3)no sewage treatment 4)over population 5)people live faraway from vaccination centres and health AIDS: 1)many people dont go for Hiv testing due to personal freedom 2)they dont know they are carriers of the disease 3)testing HIV is expensive and...
  15. joanna omar

    A level Biology: Post your doubts here!

    What's the difference between Tidal volume and vital capacity ?
  16. joanna omar

    A level Biology: Post your doubts here!

    Anyone help me out with .........> Q6 (C) http://papers.xtremepapers.com/CIE/...and AS Level/Biology (9700)/9700_s09_qp_2.pdf
  17. joanna omar

    A level Biology: Post your doubts here!

    can you help me with this http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w13_qp_12.pdf q40 and this http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s13_qp_13.pdf q39
  18. joanna omar

    A level Biology: Post your doubts here!

    dissociation curve --->The affinity of HB for Oxygen is measured experimentally by determining the % saturation of oxygen of samples of blood after exposure to air mixture containing different partial pressure of oxygen ...the results,called an oxygen dissociation curve Bohr effect (shift)...
  19. joanna omar

    Revisions for English as a second language (0510) Posted here !!!!!!

    np xoxo :D
  20. joanna omar

    A level Biology: Post your doubts here!

    LolxD...np Even though I just realized !
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