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  1. Mahnoorfatima

    A level Biology: Post your doubts here!

    Why is there a greater resistance in the systemic circulation than pulmonary?
  2. Mahnoorfatima

    A level Biology: Post your doubts here!

    In a question asking about mutation, do we have to write about the change in tRNA due to a change in mRNA as well? And, how there's an altered mRNA condon bring a wrong a.a attached to tRNA which has an altered anticodon complementary to the mRNA's codon? Also leading to a wrong sequence of...
  3. Mahnoorfatima

    A level Biology: Post your doubts here!

    Does someone have the Grade thresholds and ER's for Oct/NOv 14? Please I need it!
  4. Mahnoorfatima

    A level Biology: Post your doubts here!

    So you mean that during cold denaturation bonds do not break?
  5. Mahnoorfatima

    A level Biology: Post your doubts here!

    When enzymes are inactive do their Hydrogen bonds break distorting the shape of it?Can someone explain the complete effect of temperature on enzyme activity i.e what bonds break if the enzyme's inactive(though I think bonds are not broken during inactivity) and when the temperature is increased...
  6. Mahnoorfatima

    Chemistry: Post your doubts here!

    http://freeexampapers.com/A-Level/Chemistry/CIE/2010-Jun/9701_s10_qp_22.pdf For Question 4 part c can one of the esters of C4H8O2 he CH3CO2(CH3)CH3? please someone help!??
  7. Mahnoorfatima

    A level Biology: Post your doubts here!

    Better late than never! Thanks a BUNCH for sharing it. We'll have an idea about what to write! :)
  8. Mahnoorfatima

    A level Biology: Post your doubts here!

    Oh yes! thanks for reminding. :) What about T supresser? And, aren't T memory released as a reult of the action of T helper or no they're seperate?
  9. Mahnoorfatima

    A level Biology: Post your doubts here!

    Okay, so first thing u should know is that B and T lymphocytes work when an immune response is generated when a forgein pathogen enters the body. When a foreign pathogen enters the body, macrophages engulfs it and exposes the cell surface antigens on the pathogen's surface thus macrophages are...
  10. Mahnoorfatima

    A level Biology: Post your doubts here!

    I thought it was A as well but it's D idk why!?
  11. Mahnoorfatima

    A level Biology: Post your doubts here!

    https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9700_w14_qp_12.pdf QUESTION 6 ANYONE?
  12. Mahnoorfatima

    A level Biology: Post your doubts here!

    https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9700_w14_qp_11.pdf Question 29? There's no diagram in Mary Jones book showing the labelling of smooth muscles trachea e.t.c? How am I supposed to recognize it? Question 40? UGHHH I HATE ECOLOGY. :(
  13. Mahnoorfatima

    Chemistry: Post your doubts here!

    https://docs.google.com/viewerng/viewer?url=http://maxpapers.com/wp-content/uploads/2012/11/9701_w14_qp_33.pdf Q1 part f. HOW ARE WE SUPPOSED TO DRAW THE HESS CYCLE!!!?? Anyone?
  14. Mahnoorfatima

    Chemistry: Post your doubts here!

    AND.. There's this expt hwere you have to find enthalpy of change using NH4CL, it's an endothermic reaction then there is a question where it says describe one major source of error of the expt. Exolain why ur suggestion would produce a more accurate value?
  15. Mahnoorfatima

    Chemistry: Post your doubts here!

    PLEASE SOMEONE HELP ME OUT ON THESE: Okay so first, in a practical paper there is given a table where on the top it is written FA5, FA6 FA7 and on the side(vertical) it's written FA8 and FA9. And then it says that identify which of these ions are in which of these solutions. How am I supposed to...
  16. Mahnoorfatima

    Chemistry: Post your doubts here!

    U= C4H6O Draw the displayed formula of two structural isomers of U that each contain the same functional groups as U: IS THIS CORRECT??? If not can anyone explain WHY?? :rolleyes: https://sketch.io/sketchpad/
  17. Mahnoorfatima

    A level Biology: Post your doubts here!

    Sombody? :rolleyes:
  18. Mahnoorfatima

    A level Biology: Post your doubts here!

    There's this question where it says: Explain how it is possible to reduce the no. of deaths during a cholera epidemic in countries such as those in W.Afrrica. In the ER it says that writing about washing hands and stuff is inappropriate. But why? I wrote that people who're infected should be...
  19. Mahnoorfatima

    Chemistry: Post your doubts here!

    http://studyguide.pk/Past%20Papers/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_s08_qp_2.pdf In this same paper part aii, why can't we write the structural formula like CO2H CO2H? why do we have to writeHO2CCO2H? I always get confused while writting structural formulas...
  20. Mahnoorfatima

    Chemistry: Post your doubts here!

    So, if it's an alcohol then it'll be C2(OH)H2 with double bond between C=C?
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