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  1. H

    A2 Biology | Post your doubts here

    ITS NOT REALLY A CIE QUESTION BT.....a doubt in my mind.....how FSH can cause superovulation when it normally leads to one oocyte per cycle only ,......any idea
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    A level Biology: Post your doubts here!

    what does standard error tells us about?......
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    A level Biology: Post your doubts here!

    Outline the principles of electrophoresis as used in sequencing this DNA? ms does not anywhere mentions sequencing of DNA......WHATS THIS HYPOCRISY,,,,,is it bcos dna sequencing is not in syllabus learning outcmes? 1 cut DNA (into fragments) ; 2 by, restriction enzymes / named enzyme ; 3 place...
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    Chemistry: Post your doubts here!

    empirical formula of addition polymer is the same as that of its monomer.......this is a point mentioned by CIE in their ms....bt i never seem to understand it....i cnnt think wat wud be the end of molecule like.....i think it wud be like alkane bt this contradicts the ms point.....so kindly pls...
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    Chemistry: Post your doubts here!

    cie writes in one mS that condensation needs two different functional groups.....bt i have a problem with this cos PEG a molecule mentioned by cie in their application booklet plus in their exams ....this pmolecule's monomer is ethan1,2 diol....and PEG is a condensation polymer of this.....so...
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    Chemistry: Post your doubts here!

    The slight increase in melting point between tin and lead is due to the increased effective nuclear charge associated with the filling of f-orbitals and their relatively low screening effect . Morover, lead has a cubic close-packed structure which is tighter than the body-centred cubic...
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    Chemistry / biology /physics applications

    http://www.sciencedaily.com/releases/2011/03/110301122053.htm
  8. H

    Physics: Post your doubts here!

    Use the first law of thermodynamics to explain why the specific latent heat of vaporisation is greater than the specific latent heat of fusion for a particular substance.
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    Physics: Post your doubts here!

  10. H

    Physics: Post your doubts here!

    can u be more specific please cos its a very long question.....i guess u ll be asking for that not in phase thing cos dats the difficult part in this.....so wat u need to do is to do a graph for original equation given prev. in question......and then shift it horizontal by 120 deg. in right...
  11. H

    A level Biology: Post your doubts here!

    how the proportional increase in cell no. is calculated and what is meaning of 4th bullet point.i cant understand it
  12. H

    Chemistry: Post your doubts here!

    I is for competitve inhibition.....and II for non-competitive......why is rate for non-competitive higher than competitve but lower than normal....?
  13. H

    A level Biology: Post your doubts here!

    http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_w09_qp_52.pdf q 3 b(ii)
  14. H

    A level Biology: Post your doubts here!

    mantains food webs....mantains large gene pool.....ethical reasons e.g some people think that we must protect and preserve this vast array of species for future generations to comE.....some species can serve as a food source for humans.,....plants like herbs can have use in making...
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    need help forA level bio paper 5 and if you got notes on it , it will be nice :)

    i also need notes for biology p5.......its damn hard
  16. H

    Chemistry: Post your doubts here!

    Nickel often occurs in ores along with iron. After the initial reduction of the ore with coke, a nickel-iron alloy is formed. Use data from the Data Booklet to explain why nickel can be purified by a similar electrolysis technique to that used for copper, using an impure nickel anode, a...
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    Know everything about the subject and still not getting an A?

    yea....the same technique i use
  18. H

    A level Biology: Post your doubts here!

    explain,wid example,how environmental factors can act as stabilising or evolutionary forces of natural selection CHEK mary jones book.......there is an example in which rabbits are plunged into ice age...........in this case white rabbits will be slected for by the environment not the more...
  19. H

    A level Biology: Post your doubts here!

    EXAMPLE OF ARTIFICIAL SELECTION:
  20. H

    A level Biology: Post your doubts here!

    q1.here u ll describe both the allopatric and sympatric speciation......for allopatric u can say that a population gets isolated due to a geographical barrier so hence they cn not breed together and no gene flow occurs.....different selection pressures operate on the two separate populations...
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