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  1. S

    A level Biology: Post your doubts here!

    can someone please explain the experimental evidence for the semi-conservative replication of DNA in genetics. I dont understand the whole heavy DNA and the generations stuff...
  2. S

    Chemistry: Post your doubts here!

    Can someone please explain chemical energetics and how exactly to calculate the enthaply questions with examples of each type of calculation pleaseee
  3. S

    Chemistry: Post your doubts here!

    can someone explain or give me notes on chemical bonding and structure as well as enthaply cycles and calculations please :)
  4. S

    Lets Solve A's chem MCQ paper together.

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s10_qp_11.pdf Q-14,22,25,30, 35 can someone please explain :)
  5. S

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_11.pdf Q-14,22,25,30, 35 can someone please explain :)
  6. S

    A level Biology: Post your doubts here!

    can someone please tell me what exactly do we need to know from the chapter infectious diseases. Do we need to know how the diseases were spread in the past and the dates and countries and all that? or just an outline of the diseases history? because my text book has so much information about...
  7. S

    Biology P1 doubts.

    Um..i dont really get your question but ill explain what i think your asking anyways :) Basically for a recessive gene to be shown in the phenotype of a person they should have 2 recessive genes coz if they have 1 recessive and 1 dominant the dominant 1 will stand out so for a person to show...
  8. S

    Biology P1 doubts.

    30 will be D: coz the allele for white hair is recessive and will need 2 recessive alleles to have the white hair phenotype so 1 parent has homozygous allele for white hair and the other has grey hair which is the dominant allele but for it to produce an offspring with recessive alleles it has...
  9. S

    Biology P1 doubts.

    in q30 since they have off springs of both types of animals it immediately crosses out option A and D and if u look at the number of animals with and without spots u would see that they are almost equal, almost (1:1 ratio) and if they were of genotypes shown in B there would be way more normal...
  10. S

    Chemistry paper 31- how was it? :D

    Same here :(
  11. S

    Chemistry paper 31- how was it? :D

    Not discussing dont worry :P just want to know how it went for everyone? good or bad? :D i think i went pretty good :D We'll discuss here after 24 hours :P and who still has bio paper 1 tomorrow? :P :(
  12. S

    Chemistey Doubts

    viewtopic.php?f=24&t=9375&start=10 check this out :) 2nd page 1st post :)
  13. S

    Chemistey Doubts

    The polymerisation in a(i) is addition as it is the polyermisation of the above diagram right and the in a(ii) is condensation so theres one difference for u to state in for a(iii) :) and the other difference is that in an addition polymerisation there aren't any by products but in condensation...
  14. S

    Chemistry paper 3 doubts here!!!

    Both actually :D Thanks :D Could u also help with 4b(ii)? thanks :D
  15. S

    Chemistry paper 3 doubts here!!!

    http://www.xtremepapers.me/CIE/Cambridg ... 4_qp_3.pdf q4 (iii) :(
  16. S

    Chemistry paper 3 doubts here!!!

    But can u explain how you came up with those answers :/ i dont get how im suppose to figure it out :(
  17. S

    Chemistry paper 3 doubts here!!!

    i dont get it either, im sorry :sorry:
  18. S

    Chemistry paper 3 doubts here!!!

    The link u gave does not work :S
  19. S

    Chemistry paper 3 doubts here!!!

    http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_3.pdf Q3 :( helpp i dont get how im suppose to know the reagent and stuff :/
  20. S

    Chemistry paper 3 doubts here!!!

    I dont think u can do it with the "n" and brackets :no: i just know the NHCO bond for protein
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