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  1. G

    Physics: Post your doubts here!

    thanx a ton brotha!
  2. G

    Physics: Post your doubts here!

    can anyone please explain how brightness is linked with the formula a = lambda x D/x :(
  3. G

    Physics: Post your doubts here!

    ok thnx!
  4. G

    Physics: Post your doubts here!

    ms: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_ms_22.pdf qp: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_22.pdf for 4a can someone please very very kindly give a picture of...
  5. G

    Physics: Post your doubts here!

    but we know that a frictional force will act on the other raindrop too, its impossible that it doesnt.... i read the examiners report and i understand. thank you though!
  6. G

    Physics: Post your doubts here!

    so you arnt supposed to use the formula :confused:
  7. G

    Physics: Post your doubts here!

    ms: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_ms_22.pdf qp: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_22.pdf in question 2bii, if you rearrange the equation you get that r...
  8. G

    Physics: Post your doubts here!

    ms: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_ms_22.pdf qp: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_22.pdf in question 2bii, if you rearrange the equation you get that r...
  9. G

    A level Biology: Post your doubts here!

    GOOD LUCK everybody, this thread was some great help for the past few days :D
  10. G

    A level Biology: Post your doubts here!

    in this question you are not going into the deep details of the immune response, its outlining the method, so we know that both B and T cells are activated...you can mention the B cells here since they are the ones which divide to produce the antibodies, so it will be understood that they were...
  11. G

    A level Biology: Post your doubts here!

    According to what i understand the T cells release cytokines which activate B cells. so T cells are activated first when the phagocyte displays the non self antigens.
  12. G

    A level Biology: Post your doubts here!

    hilicase: breaks the H bonds between the bases when ''unzipping'' occurs before replication. DNA polymerase: it attaches every incoming nucleotide to the previous strand being formed complementary to the template. (forms the sugar-phosphate backbone)
  13. G

    A level Biology: Post your doubts here!

    Carboxyhaemoglobin is when haemoglobin reacts with CO (carbon monoxide)... and carbino haemoglobin is when some of the CO2 inside the RBCs reacts with the amine -NH2 groups in haemoglobin. 10% of carbon dioxide is transported in this form.
  14. G

    A level Biology: Post your doubts here!

    i dont think so, J is the nucleolus, this is where the ribosomes are manufactured. while transcription is the formation of the mRNA molecule..this takes place in the nucleoplasm (nucleus) >> H.
  15. G

    A level Biology: Post your doubts here!

    my bad...ur right, T killer cells. thank you.
  16. G

    A level Biology: Post your doubts here!

    this is posted by a member on the previous few pages you can see it there...good luck!
  17. G

    A level Biology: Post your doubts here!

    Primary response 1) the pathogen invades the body 2) it damages or weakens body cells 3) the weakened body cells produce proteins called histamines 4) the phagocytes in the blood are attracted to these proteins...(chemotaxis) 5) the phagocytes (macrophages) engulf the pathogen by phagocytosis...
  18. G

    A level Biology: Post your doubts here!

    oh i wrote potential difference somewhere there...ignore that, physics and bio are taking over me :P
  19. G

    A level Biology: Post your doubts here!

    The mark scheme says, (water) moves out of, cell / Q. This is true, the water potential inside cell Q is more than the empty space in the spongy mesophyll layer, a potential gradient is created, and water moves down the potential difference, via a cell membrane out of Cell Q and onto the cell...
  20. G

    A level Biology: Post your doubts here!

    In semi conservative replication, the two strands of DNA unwind and each serves as a template for a new double helix to form. This produces two DNA molecules which are exact copies of each other, this helps maintain the genetic stability of the organism, and prevents any mutations from...
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