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  1. salma_69

    Biology P51

    anyways it's only 3 marks and i guess you get marks when mentioning using distilled or deionised water and stirring so if in case we lose or sth it will be 1 mark i guess hopefully
  2. salma_69

    Biology P51

    yeah i hope they accept a lot of methods
  3. salma_69

    Biology P51

    ooops then i wrote something and explained sth else *facepalmed* i hope they go blind while reading this :/ the conversion part i mean is as i remember they said we have a 1 mgcm-3 subtilisin and we need to prepare different conc ranging from 20 ugcm-3 - 100 ugcm-3 i forgot doing this and just...
  4. salma_69

    Biology P51

    oh yeah i did the same :D do you think we will lose marks for not converting
  5. salma_69

    Biology P51

    like how proportional i don't get it
  6. salma_69

    Biology P51

    i did the same but not the halfing method i made conc 0.8, 0.6, 0.4, 0.2
  7. salma_69

    Biology P51

    i even forgot to do this step i just did the normal serial dilution and used the formulae c1v1=c2v2 how did u do it
  8. salma_69

    Biology P51

    did you convert from mg to ug in this question
  9. salma_69

    Biology P51

    STOPWATCH i don't remember seeing this what was that
  10. salma_69

    A level Biology: Post your doubts here!

    this might help https://www.xtremepapers.com/community/threads/biology-paper-5-tips.27105/
  11. salma_69

    A level Biology: Post your doubts here!

    specimen 07 :/ could the ms be wrong:confused:
  12. salma_69

    A level Biology: Post your doubts here!

    the ms answers are too weird can someone explain plz part ii and iii
  13. salma_69

    A level Biology: Post your doubts here!

    it is specimen 07
  14. salma_69

    A level Biology: Post your doubts here!

    guys this question is about effect of temperature on oxygen uptake what is Q10=2
  15. salma_69

    A level Biology: Post your doubts here!

    don't mention it ;);)
  16. salma_69

    A level Biology: Post your doubts here!

    i go for B as during asthma attacks more mucus is produced cuz some foriegn substance actually entered which triggered the asthma attack so choice 2 is now eliminated as exocytosis will increase not endocytosis and as 2 is eliminated the ans should be B the cilia will be more active as it will...
  17. salma_69

    A level Biology: Post your doubts here!

    they are not the same one is about solute potential and one is about solute concentration this makes the 2 questions different as solute potential is the opposite of solute concentration:)
  18. salma_69

    A level Biology: Post your doubts here!

    i don't get why when i add te 85g to 1 dm^3 i get 1 mole:confused:, like is it fixed with any other molar mass. What's the use of that step anyway
  19. salma_69

    A level Biology: Post your doubts here!

    can someone explain to me this question Scribd q1 part b (ii) P.S i didnt take chem AS
  20. salma_69

    accounting doubts anyone i am ready to answer it

    http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Accounting%20(0452)/0452_s13_qp_23.pdf question 5a please help me with that.
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