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  1. D

    A level Biology: Post your doubts here!

    Thanks for your advices! Can someone show me how should I draw 2 adjacent plant cells? Especially the area where the plant cell walls are and the middle lamella...
  2. D

    A level Biology: Post your doubts here!

    Those are the cells that must be drawn, right? And it the mark scheme says that do not give points if mitochondria are drawn... which are the mitochondria? dark blue? and the nucleus light blue?
  3. D

    A level Biology: Post your doubts here!

    Can someone check my drawing? I know it has a lot of mistakes, but I have no one to check it. It is the exercise 2. c) from this paper: http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w12_qp_35.pdf Here's my drawing...
  4. D

    A level Biology: Post your doubts here!

    Thanks a lot!!
  5. D

    A level Biology: Post your doubts here!

    Yes, I did it in the same way. But the mark scheme says that volumes of R (in cm^3) and 0.375, 0.25, 0.125...
  6. D

    A level Biology: Post your doubts here!

    Can someone help with 1. a) iii) from here http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w12_qp_33.pdf I'm trying for an hour already to make those solutions and I don't know how to complete the table... in the mark scheme it states...
  7. D

    A level Biology: Post your doubts here!

    I downloaded and readed it, but it is far too long
  8. D

    A level Biology: Post your doubts here!

    Can someone help me with this? "Explain the meaning of the term immune response making reference to the terms antigen, self and non-self."
  9. D

    A level Biology: Post your doubts here!

    can you tell me the paper, please?
  10. D

    A level Biology: Post your doubts here!

    Thanks a lot! :D do you know anything about the point regarding the preventions and cure of CHD?
  11. D

    A level Biology: Post your doubts here!

    Can anyone explain me the following point in the syllabus? " . (a) explain the need for transport systems in multicellular plants and animals in terms of size and surface area to volume ratios; " And also this one: (j) discuss the difficulties in achieving a balance between preventions...
  12. D

    A level Biology: Post your doubts here!

    I see. What about errors and ways of improvements?
  13. D

    A level Biology: Post your doubts here!

    Thanks man!! Can you tell me where I can get some infos about drawing those tables for paper 3?
  14. D

    A level Biology: Post your doubts here!

    Amy Bloom, thanks. Can someone help me with this point in the syllabus? "Outline the need for communication systems within mammals to respond to changes in the internal and external environment"
  15. D

    A level Biology: Post your doubts here!

    how can I prepare for paper 5? I know about past papers, but is there anything else?
  16. D

    A level Biology: Post your doubts here!

    Are there some specific diagrams I should know how to draw or in the exam I can have virtually anything?
  17. D

    A level Biology: Post your doubts here!

    I also have a question regarding respiration and oxygen debt. So when oxygen is not available, the pyruvate obtained from the glycolytic pathway does not enter the link reaction, right? Because of this, it is not combined with coenzyme A to form acetyl coenzyme A therefore the Krebs cycle will...
  18. D

    A level Biology: Post your doubts here!

    are there any notes for the paper 4 chapters? I haven't found any. Thanks!
  19. D

    A level Biology: Post your doubts here!

    Especially immunity if you can...
  20. D

    A level Biology: Post your doubts here!

    Hey, thank you for the infectious disease notes! Do you have notes on any other chapter, AS or A2?
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