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  1. phanttasy

    A level Biology: Post your doubts here!

    Because the hydrogen bond is between 2 nitrogenous bases on each strand.. If we multiply 700 by 3, it means that there are 700 nucleotides on each strand of DNA molecules. Since a DNA molecules has 2 strands of polynucleotides, there will be a total of 1400 nucleotides in the DNA molecules. The...
  2. phanttasy

    A level Biology: Post your doubts here!

    19: Telomere does not have any genetics material. It protect the ends of the chromosomes. It will "degenerate" in each nuclear division. So the cell will stop dividing if there is no telomere. If there is no telomere, the nitrogenous base in the end of chromosome will be "degenerate", so the...
  3. phanttasy

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w11_qp_11.pdf Q8, Q16, Q25 and Q 28... help please
  4. phanttasy

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s12_qp_12.pdf Q24, Q30 and Q5
  5. phanttasy

    Last minute preparation on MCQS 9701 and 9702. Discussion here.

    Thank you very much!
  6. phanttasy

    Chemistry: Post your doubts here!

    Help please。 answer is B
  7. phanttasy

    Last minute preparation on MCQS 9701 and 9702. Discussion here.

    sorry! it is chemistry :p
  8. phanttasy

    Last minute preparation on MCQS 9701 and 9702. Discussion here.

    Need help on question 9 in 2007 ON variant 1
  9. phanttasy

    Physics: Post your doubts here!

    The answer is A but i could not get it :( Help please
  10. phanttasy

    Chemistry A2 topicals P4 are finally here!!!

    Thank you!!
  11. phanttasy

    Chemistry: Post your doubts here!

    The thermal decomposition of Group 2 decreases down the group is due to the cation increases in size, and small cation with higher charge tend to undergo thermal decomposition with large anion. What would happened if both cation and anion are small in size too?
  12. phanttasy

    Chemistry: Post your doubts here!

    Oh.. I see... Is it also means that 1 mole of (NH4)2CO3 has 3 mole of oxygen atoms/ 1 mole of carbon/ 8 mole of carbon atoms?
  13. phanttasy

    Chemistry: Post your doubts here!

    need help on this! How many moles of nitrogen,N are in 0.65mole of (NH4)2CO3? How many grams of this compound supply this much nitrogen?
  14. phanttasy

    Chemistry: Post your doubts here!

    Whats is the oxidation of S in CS2? The answer says —2 but i calculated myself i got +1
  15. phanttasy

    Chemistry: Post your doubts here!

    Thank you very much :)
  16. phanttasy

    Chemistry: Post your doubts here!

    i have problem while solving question number b iii) :( your help will be much appreciated
  17. phanttasy

    Sharing my CIE A-level Chemistry notes [AS chapters completed]

    Thank you for your notes! Looking forward to your complete A2 notes ^__^
  18. phanttasy

    Mathematics: Post your doubts here!

    Need help on this question. At a particular point of a curve y=5x^2 -12x +1 the equation of the normal is x +18y +c=0. Find the value of constant c.
  19. phanttasy

    Physics: Post your doubts here!

    guys, do you have any reference book for physics recommend? :(
  20. phanttasy

    Mathematics: Post your doubts here!

    So today I bought a photostat version or this but found out that there was no answer behind! Does anyone know where can I find the solutions for this book? p/s: this is a practice book, it's not a test book :(:(:(:(
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