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  1. A

    Bio p22 and 52

    i wrote transpiration is when water diffuse from higher conc. gradient to lowe conc. gradient down the concentration gradient from an air space to outside through stomata while evaporation when water moves from cell wall from higher water ptential to lower ,down water potential by osmosis into...
  2. A

    How was your biology paper 22? I am so sad and devastated.

    for the endoplasmic reticulum iwrote smooth endoplasmic reticulum what was its function?that wasnt clear o.O
  3. A

    How was your biology paper 22? I am so sad and devastated.

    im a girl :D btw what did u write for that labeling figure what were A B and C?
  4. A

    How was your biology paper 22? I am so sad and devastated.

    its that question which was like:name the covalent bond formed between the neucleotides
  5. A

    A level Biology: Post your doubts here!

    when co2 combine directly with the -NH2 group (amine group) without that reaction that involve carbonic anhydrase enzyme >>> carbo amino haemoglobin is formed while when carbon monoxide combine with haemoglobin ,,carboxyhaemoglobin is formed
  6. A

    A level Biology: Post your doubts here!

    for loading of sucrose: - the hydrogen ions in the companion cell are pumped outusin ATP as source of energy -this create a high level of H+ ions outside companion so move back down their conc. gradient with sucrose molecules from mesophyll cells through co-transporter(against conc. gradient of...
  7. A

    A level Biology: Post your doubts here!

    thank u alot :) .....haha im not a man :D ^_^
  8. A

    Chemicals spilled to the question paper?

    you're not alone i spilled kmno4 too! LOL and some girls with me had the same problem but when we told the teacher she told us thats ok ..dont worry what to do for them?! we cant keep the paper so far we should write the answers :D
  9. A

    A level Biology: Post your doubts here!

    you're welcome ^^
  10. A

    A level Biology: Post your doubts here!

    thank u ...so for c02 transport shall i know the steps of formation of carbamino-haemoglobin ?cuz the teacher didnt mention that . we took the bohr''s effect only
  11. A

    A level Biology: Post your doubts here!

    i dont think that Type of immunoglobulins are included 6 ways are: 1- antibody combine with viruses and bactrial toxins preventing them entering or damaging cells 2-attach to their flagella so they become less active 3-antibodies with multiple binding sites can cause agglutination of bacteria...
  12. A

    A level Biology: Post your doubts here!

    hi why is the antibiotics non effective on viruses? and is the co2 transport included in the syllabus or i should only know the bohr's effect?
  13. A

    Some biology practical doubts

    yeah this is what i meant thank you....so we can leave the vascular bundle position and identify it by label only?
  14. A

    Some biology practical doubts

    hi everyone ..how to do labeling for a xylem or vascular bundle ,by drawing circles?
  15. A

    AS Chemistry P2 Prep.

    yaaay :)
  16. A

    AS Chemistry P2 Prep.

    for NACL+conc. H2SO4 its heat under reflux right? PI3 is heat and pcl5 is Room temp .....im i right?? i mean the halogenoalkanes :)
  17. A

    Chemistry: Post your doubts here!

    really thank u sooo much..this is so appreciated :)
  18. A

    Chemistry: Post your doubts here!

    i think its permanent cuz the hydrogen bond occurs only with nitrogen,oxygen,fluorine (N,O,F)
  19. A

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s09_qp_2.pdf q3 dii can anyone explain please..when to use the 0.50-x and 0.20+x method and 1 more doubt is the type of bond in PH3 permanent or induced? how to get it?
  20. A

    Igcse Ict M/J 2012 Paper 1

    no the light sensor is also correct i also wrote light before but i crossed it out..most of the students with me did light :) i did it wiki but i know thats incorrect
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