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  1. S

    A level Biology: Post your doubts here!

    I have biology paper 22 exam tomorrow....:D
  2. S

    A level Biology: Post your doubts here!

    It is a quarternary structure....so contains all the 4 bonds as in tertiary structure......
  3. S

    Physics: Post your doubts here!

    Can you elaborate a bit more.....I mean, won't the wave travel a further more after 5 sec...and for the wave given isn't the time period 30m/s....a bit confused here....:unsure:
  4. S

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s13_qp_22.pdf..... Q.no.5 b(iii)...A little bit of a help in graph part...anyone?....
  5. S

    A level Biology: Post your doubts here!

    At PCT , urea is some urea is absorbed due to its small size....not all of them.....so at DCT and collecting duct, almost all of the water is absorbed, leaving urea and other waste products....so, its concentration increases....
  6. S

    A level Biology: Post your doubts here!

    Potometer is not that difficult....just go through the book once, i think you will understand it....and i have seen a potometer related question in p2..so there's a chance
  7. S

    A level Biology: Post your doubts here!

    So, guys exams are almost here...so if any of us has any confusions in any topic....let us discuss here and try to get clear of all the doubts we have.....
  8. S

    A level Biology: Post your doubts here!

    Ok, 1 can't be correct, because in an active tissue, high amount of co2 are produced, so in the presence of co2, you can't expect HB to react with O2. 2 can be correct, because, you know that, co2 diffuses into the RBC and it forms H2CO3, catalysed by carbonic anydrase...the H2C03 dissociates...
  9. S

    A level Biology: Post your doubts here!

    Here is the calculation,from 1st diagram 50 eyepiece divisions=0.1 stage 1 EP=0.1/50 stage Convert it to micrometer, 1EP=0.1/50 multiplied by 1000, which is 2 micrometer. Now from 2nd diagram, The increment in 4 hours is 10 division So 1 division of EP=2 10 division of EP=2 into 10...
  10. S

    Chemistry: Post your doubts here!

    Really...haha, i have no idea why did that happen...here's the question...http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s12_qp_51.pdf Q.1...c(iii)
  11. S

    Chemistry: Post your doubts here!

    Help me with this one ..http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s12_qp_51.pdf Q.no.1...c(iii)
  12. S

    Chemistry: Post your doubts here!

    Well that's because, i am a bio student too....:D.....
  13. S

    Chemistry: Post your doubts here!

    Haha same here.....NMR is too much of a headache.....
  14. S

    Chemistry: Post your doubts here!

    A2 guys, how much marks are you guys expecting in this session?
  15. S

    Mathematics: Post your doubts here!

    First get the direction of the line AB....this will be perpendicular with the plane's normal.....equate their dot product to 0.......you will get an equation.....now use the given angle and ......you will get another equation.....solve the two equations...you will get the value of b and c......
  16. S

    Chemistry: Post your doubts here!

    If you look at the 2nd reaction the double bond in aldehyde is being attacked by CH3CH2O-, which is a nucleophile, and it involves formation of a single product, so it is nucleophilic addition
  17. S

    Chemistry: Post your doubts here!

    GaN in which Ga exists as 3+ so N must exist as N3-, and it now it has 3 more eletrons...so total of 10
  18. S

    Chemistry: Post your doubts here!

    Nitrogen will exist as N3- ion....so it will have total of 10 electrons....so, the answer is D
  19. S

    Chemistry: Post your doubts here!

    My friend, i tried doing it using the E values......but, i did not match with what we have actually studied...but on our coursebook, an list of increasing ease of oxidation of elements are given...see that...it will help you
  20. S

    Chemistry: Post your doubts here!

    Ahhhh...what did i do up there......sorry....i,myself got pretty confused ....let me think....:p
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