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Recent content by oahmed64

  1. oahmed64

    Bio 42 2015!!!

    Was it really that easy? People say section b was really hard
  2. oahmed64

    Bio 42 2015!!!

    Which question?
  3. oahmed64

    Bio 42 2015!!!

    Hey,how did it go for you guys? Was it hard? We're there any tricky or unusual questions?
  4. oahmed64

    Biology P51

    Guys how many marks will I lose for halving the concentrations?
  5. oahmed64

    Biology P51

    [QUthat's Senorita.K, post: 916533, member: 143857"]when you are using serial dilution method you dont have to use any formula :) c1v1=c2v2 formula is used for normal dilution(dilution other than serial dilution) , you can never use this formula for serial dilution because serial dilution means...
  6. oahmed64

    Biology P51

    I wrote that we will use serial dilution and did the halfing method (decrease the conc by half each time ) is this correct ?
  7. oahmed64

    Biology P51

    What did you guys write in the dilution question?? Please answer ? Was it serial or proportional ?
  8. oahmed64

    Hey could I ask what the topics of paper 52 biology were please?

    Hey could I ask what the topics of paper 52 biology were please?
  9. oahmed64

    Hey could I ask what the topics of paper 52 biology were please?

    Hey could I ask what the topics of paper 52 biology were please?
  10. oahmed64

    Hey could I ask what the topics of paper 52 biology were please?

    Hey could I ask what the topics of paper 52 biology were please?
  11. oahmed64

    Hey could I ask what the topics of paper 52 biology were please?

    Hey could I ask what the topics of paper 52 biology were please?
  12. oahmed64

    A level Biology: Post your doubts here!

    Mahmood Magdy, thanks for answering, could you PLEASE answer my question again ? One thing I do not understand is what does it mean when they say in the mark scheme that ferric oxidizes other ores ? does this mean that the bacteria oxidizes ferrous to ferric and then ferric oxidizes sulfide to...
  13. oahmed64

    A level Biology: Post your doubts here!

    Hey could anyone PLEASE give me a model answer for how bacteria is used in extracting metals?
  14. oahmed64

    Biology P41 and P51 June 2015 difficulty poll and exam prediciton

    Hey guys Really nervous for the upcoming exam,just wanted to get you opinions on how you think the exams will be difficult this year. Share with us your opinion on what topics you expect the examiner to be brining this year and what we should focus on. Add any valuable tips you have so it may...
  15. oahmed64

    Help with very hard question in biology P5

    Hey, Can anyone help me with this reallly hard question (J14,52,Q1,E)I AND II)
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