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  1. J

    Chemistry: Post your doubts here!

    31 Which statements are correct in terms of the Brønsted-Lowry theory of acids and bases? 1 Water can act as either an acid or a base. 2 Sulfuric acid, H2SO4, does not behave as an acid when dissolved in ethanol, C2H5OH. 3 The ammonium ion acts as a base when dissolved in liquid ammonia. Answer...
  2. J

    Physics: Post your doubts here!

    Anybody know? Answer is B, why isnt half life 90 minutes?
  3. J

    Physics: Post your doubts here!

    Anybody know? Answer is B, why isnt half life 90 minutes?
  4. J

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s10_qp_11.pdf Guys, need help! :O Q 16, 27, 34, 36 Answer is 16 D 27 A 34 A 36 D Pls help :D THANKS!
  5. J

    Physics: Post your doubts here!

    A small charge q is placed in the electric field of a large charge Q. Both charges experience a force F. What is the electric field strength of the charge Q at the position of the charge q? A) F/(Qq) B) F/Q C) FqQ D) F/q Answer is D, why isn't B? :O HELP
  6. J

    Physics: Post your doubts here!

    The order of magnitude of the frequency of the longest-wavelength ultraviolet waves can be expressed as 10^x Hz. What is the value of x? A 13 B 15 C 17 D 19 Answer is B, why?
  7. J

    A level Biology: Post your doubts here!

    It is not C and D because the assemble of free DNA nucleotide is in opposite direction, from 5' to 3'. It is not B because there is a URACIL instead of THYMINE. Uracil is for transcription and translation but NOT for DNA replication, should be thymine. Hence is A.
  8. J

    A level Biology: Post your doubts here!

    Cancer cells divide out of control, forming tumours. Which statement describes the difference between a cancer cell and a normal cell? A Cancer cells do not undergo cytokinesis. B Cancer cells have a shorter interphase. C Cancer cells do not have metaphase. D Only cancer cells have...
  9. J

    A level Biology: Post your doubts here!

    HIV-1 protease is an enzyme produced by the HIV virus. Two identical chains of 99 amino acids form the enzyme. In each chain, amino acids 25, 26 and 27 in the sequence form part of the active site. Which orders of protein structure control the shape of the active site? A primary, secondary...
  10. J

    Chemistry: Post your doubts here!

    What will react differently with the two isomeric pentanols, (CH3)3CCH2OH and (CH3)2CHCH2CH2OH? A acidified aqueous potassium manganate(VII) B concentrated sulphuric acid C phosphorus pentachloride D sodium Why is it B? Both are primary alcohol, should it both become Alkene?
  11. J

    A level Biology: Post your doubts here!

    http://olevel.sourceforge.net/papers/9700/9700_s13_qp_12.pdf need HELP IN Q3,4, 16, 40 3C 4A 16D 40A
  12. J

    A level Biology: Post your doubts here!

    20) DNA replication occurs at interphase 21) statement 1 and 2 are interphase, only 3 is metaphase 22) maximum hydrogen bonds between 2 bases are 3 hydrogen bonds, 700 * 3 = 2100 24) transcription product is mRNA. Must know.
  13. J

    A level Biology: Post your doubts here!

    1) it's MICROSCOPE, only can reach till micro μm, hence is 3 and 4 4) use formula (pie)r^2. See properly, there is 100 small divisions along the circle. Since 0.1mm(1 division of bigger scale) covers 40 smaller divisions, use ration method to calculate. 100/40 = (diameter)/0.1mm. Then u get...
  14. J

    A level Biology: Post your doubts here!

    :D need some help in this http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s08_qp_1.pdf Q26, 34, 37 26A 34D 37B Thanks (:
  15. J

    Chemistry: Post your doubts here!

    Love your explanation! Thanks :D
  16. J

    Chemistry: Post your doubts here!

    Hey, need help in http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w07_qp_1.pdf Thanks! (: Q9, 35, 37 9B 35B 37B
  17. J

    A level Biology: Post your doubts here!

    Thanks!!!!! :D help a lot love u!!!
  18. J

    A level Biology: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s07_qp_1.pdf Need help in Q15, 24 15C. 24C. Need help pls!!! :o thanks!!!
  19. J

    Chemistry: Post your doubts here!

    Can anyone help me? :o http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s06_qp_1.pdf Q18, 20, 33, 34, 35, 36 18C 20C 33D 34C 35D 36B Really need help thanks :00
  20. J

    Chemistry: Post your doubts here!

    Guys need some help. http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w05_qp_1.pdf Q 4, 5, 33, 35 4C (why only carboxylic acid BP affected by hydrogen bond, why not aldehyde too?) 5A 33A 35A
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