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  1. L

    Physics: Post your doubts here!

    I wonder if amplitude is a vector quality or scalar? The definition is max displacement. Displacement is a vector, but some books also said that amplitude is the MAGNITUDE of max displacement. I don't think that amplitude needs a direction, right? So I just got confused.........
  2. L

    A level Biology: Post your doubts here!

    Can anyone tell me what is the structural differences between smooth ER and Golgi apparatus? I am sooooo confused with the shape of these two.. To be more specific, if they both show up in a microscopic photograph of a cell, how can I distinguish them? Pls help !!! TAT
  3. L

    Chemistry: Post your doubts here!

    all right, thank you very muchhhhhhhhhh anyway XD!!!
  4. L

    Chemistry: Post your doubts here!

    yeah I know. But according to your reply, when we change the temperature, there should also be a new equilibrium, so the equilibrium constant should remain unchanged..... Oh my gah I am totally confused TAT
  5. L

    Chemistry: Post your doubts here!

    Can anyone explain to me why change in pressure won't affect equilibrium constant?
  6. L

    Chemistry: Post your doubts here!

    I got that!! Thx!!
  7. L

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w10_qp_12.pdf quetion 27 the answer is A please explain what happens here..
  8. L

    Chemistry: Post your doubts here!

    Can anyone answer my questions PLEASE!!!! TAT..
  9. L

    Physics: Post your doubts here!

    That's a hard one.. My teacher had talked about this question before.. F=Vq/d=ma so a Vq/md let's take Li as an example, q for Li is 3 but m for Li is 7 (7 nucleons) , so a= 3/7 ( I ignore V and d cuz it's the same) and after you work out the acceleration for other elements in this way, you...
  10. L

    Chemistry: Post your doubts here!

    C2Cl4 it will be helpful if you draw the structure( C=C , and each has 2 Cl bonded) and this molecule is symmetrical so there's no difference between the electronegtaivities so no permanent dipole..
  11. L

    Chemistry: Post your doubts here!

    mj/08 qp1 question 27: please tell me how to judge between the answer C&D question 38: please tell me what happens during these process http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s08_qp_1.pdf Thx a lot!!!!
  12. L

    A level Biology: Post your doubts here!

    for iii), the first codon is not AUG which is the initial codon and translation should start with AUG, so this one can't be the answer. for i) the second codon is UGA which is called a stop codon. and in iv), the 4th codon UAA is also a stop codon. Another stop codon is UAG which is not shown in...
  13. L

    A level Biology: Post your doubts here!

    for god's sake I always mix up those 2 words .... I swear the thing in my mind is prokaryote... Thanks for pointing out this stupid mistake...
  14. L

    A level Biology: Post your doubts here!

    well, here's my opinion.. since the eukaryotic cells do not have nucleus so mitosis cannot occur.. and the second question..I've seen that question before but I forgot from which paper it is in.. RER has ribosomes so mRNA can also be found there
  15. L

    A level Biology: Post your doubts here!

    well, I think the answer is C and A, am I correct?
  16. L

    A level Biology: Post your doubts here!

    thank you anyway >w<
  17. L

    A level Biology: Post your doubts here!

    thank you!! when I saw the question I thought it meant break the disulfide bonds in the hinge region ORZ...So the hydrolysis is occurring at the polypeptide chains but not at the bonds, right?
  18. L

    A level Biology: Post your doubts here!

    There is a question in the pastpapers that says an enzyme will hydrolyze the hinge region of antibodies and break the antibodies into "3" fragments. How can they break into 3????? Shouldn't the antibodies break into 2 parts each contains one heavy chain and one light chain if hydrolysis occurs...
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