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  1. J

    AS Biology paper 22 May 13th 2013

    Yes the enzyme is inactive, but we had to describe why it was inactive. There wasnt really any other viable definition coming to mind considering he said the enzymes never worked even when returned to their normal working temperatures. We were only taught one definition in the syllabus, that of...
  2. J

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20%289702%29/9702_w08_qp_4.pdf Hey guys, could someone please help me out in the above paper? :) firstly i dont get in question 3 why are we multiplying v by 11? shouldnt the amplitude be 8 mm above...
  3. J

    AS Biology paper 22 May 13th 2013

    Im pretty sure thats wrong, sorry :/ Artificial passive would've been injecting antibodies..
  4. J

    AS Biology paper 22 May 13th 2013

    Bhai CHD was a seperate question, the one relating to how doctors treated the disease. calm down, im sure you'll do fine, focus on other papers instead of worrying over this one.
  5. J

    AS Biology paper 22 May 13th 2013

    No problem, remember me in your prayers :)
  6. J

    AS Biology paper 22 May 13th 2013

    Artificial Active. Everyones were different, mine were that the product is DNA and mRNA, the product stays in nucleus [DNA] or leaves [mRNA], and whereas replication only involves AD, THY, CYT, GUA, transcription also has URA in it.
  7. J

    AS Biology paper 22 May 13th 2013

    Well like i said we had to number the stages of heart beat and then tell why left side is thicker then the right [Ventricles].
  8. J

    AS Biology paper 22 May 13th 2013

    That made no sense o_O. Explain? And the surface antigens one was so annoying because of such little space -_- it was basically that vaccine exposes the body to one kind of antigen and if the disease carrier changes his antigens then its effectively a new disease as B lymphocytes are specific...
  9. J

    AS Biology paper 22 May 13th 2013

    Hassan it was question number 6 in variant 22....are you sure you did variant 22?
  10. J

    AS Biology paper 22 May 13th 2013

    It was indeed made of alpha glucose but the very last sugar was an alpha glucose pair as well, and as far as i remember, the structure was not one likely of maltose or sucrose. Actually, here you go: http://upload.wikimedia.org/wikipedia/commons/0/09/Trehalose_Haworth.svg Shows that...
  11. J

    AS Biology paper 22 May 13th 2013

    I just wrote what happens in natural denaturation, nothing else was really making any sense.
  12. J

    AS Biology paper 22 May 13th 2013

    Yes, it was one of the last questions. The disaccharides according to me were: cellobiose, sucrose, maltose, trehalose, from A down D.
  13. J

    AS Biology paper 22 May 13th 2013

    Smoking caused TB because: 1) the tar paralyzed cilia and incites mucus production enabling the TB pathogen to live in the mucus and grow. Carbon Monoxide would also combine with Heamoglobin giving carboxyheamoglobin, impairing the bodies ability to transport oxygen and inducing lethargy...
  14. J

    AS Biology paper 22 May 13th 2013

    Keep in mind the question asked us to DESCRIBE the difference as well! Secondly, the sequence for heart beat was : SAN sends signal -> atria contract -> avn sends signal -> Purkyne send signal -> ventricals contract
  15. J

    A level Biology: Post your doubts here!

    I have a pretty silly question :P if we encounter a question for say, 5 marks, and the marking scheme gives 10 seperate points which are relevant to the question, does that mean we need to tell them all 10 separate points?
  16. J

    AS Biology paper 22 May 13th 2013

    Is the 24 hour period up yet? This was one of the more confusing papers imo, quite different from the papers of 3-4 years back and more :o
  17. J

    Complete AS Biology Notes (P1 and P2)

    :D np and im pretty sure SOME xylem cells are still alive despite being lignified...but maybe thats too deep to be in the AS syllabus
  18. J

    How was Chemistry P5?

    i wrote just the value and i was right but i forgot to explain :( I hope it gets marks...
  19. J

    AS LEVEL BIOLOGY... discuss here AS students only :)

    you missed human heart :P which is a seperate chapter for some reason.
  20. J

    AS LEVEL BIOLOGY... discuss here AS students only :)

    I think he means where the parasite and host both benefit from each other like rhizobium and a few trees which need nitrogen in nitrogen-scarce areas....but i dont think that relationship is part of AS or even A2.
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