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  1. xtremeforums

    biology paper 1 doubts

    ok so lets just all stick to what Ranoosh said: At low power, u can see the cytoplasm with many dense granular bodies (refer to june 2012 question 2.) At high power u can see, chloroplasts, nucleus, starch grains, vacuoles. u cant see the ER, ribosomes, mitochondria, lysosomes or cell membrane
  2. xtremeforums

    biology paper 1 doubts

    lol :p or maybe the blurry structures you saw using the microscope were just specks of dust? But jokes apart! If this question does come up... what would u all choose??
  3. xtremeforums

    biology paper 1 doubts

    hmmm.. x400 means using the x40 lense on the microscope right? because x10 is the fixed magnification of the ocular. Am i right? Anyway, lets just stick to mitochondria not being visible with a light microscope... ?
  4. xtremeforums

    biology paper 1 doubts

    Thanks!!
  5. xtremeforums

    biology paper 1 doubts

    In november 10 variant 1 question 1... The answer is D. Stating that mitochondria are not visible under high power x400 light microscope. Can u please clarify that?
  6. xtremeforums

    biology paper 1 doubts

    Can someone please make a list of organelles that can be viewed with a light microscope?
  7. xtremeforums

    biology paper 1 doubts

    Hmm makes sense! Thanks!
  8. xtremeforums

    biology paper 1 doubts

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w07_qp_1.pdf Nov 07 question 34. Which disease is not likely to pass directly from parent to child? A. Cholera B. AIDS C. malaria D. tuberculosis. Why is the correct answer C? The only sense i...
  9. xtremeforums

    biology paper 1 doubts

    because the habitat of the tree is not mentioned. The tree "provides" a habitat for other organisms, yet again, another role of the tree, i.e. its niche.
  10. xtremeforums

    biology paper 1 doubts

    Can somebody please post may june 2012 papers? thanks!
  11. xtremeforums

    biology paper 1 doubts

    Thankyou so much! Great explanation!
  12. xtremeforums

    biology paper 1 doubts

    Variant 1....
  13. xtremeforums

    Nov 09. ques 13 Pleeease explain why the answer is A and not C? Thanks...

    Nov 09. ques 13 Pleeease explain why the answer is A and not C? Thanks...
  14. xtremeforums

    biology paper 1 doubts

    Nov 09. ques 13 Please explain why the answer is A and not C? thanks..
  15. xtremeforums

    A level Biology: Post your doubts here!

    http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_w08_qp_1.pdf Question 36. :unsure: Why does increasing resistance to antibiotics and other drugs increase the spreading of malaria? Malaria is caused by a protoctista not a bacterium... ? Please answer...
  16. xtremeforums

    biology paper 1 doubts

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w08_qp_1.pdf Question 36. Why does increasing resistance to antibiotics and other drugs increase the spreading of malaria? Malaria is caused by a protoctista not a bacterium...
  17. xtremeforums

    biology paper 1 doubts

    t tRNA molecule is specific to one type of aminoacid. Since the polypeptide contains four different types of aminoacids, the minimum number of tRNA molecules needed would be 4. One for each type of amino acid.
  18. xtremeforums

    I answered that on the thread. Hope that helps :)

    I answered that on the thread. Hope that helps :)
  19. xtremeforums

    biology paper 1 doubts

    A DNA molecule is double stranded. And only one strand is used as a template for transcription. So 120/2=60. This would give you the number of nucleotides on one strand of the DNA. 3 codons on the mRNA code for one amino acid. So 60 would code for how many aminoacids? Cross multiply. 60/3=20...
  20. xtremeforums

    biology paper 1 doubts

    may/june 08. Q27. Why is the answer C and not A? i understand that lignin is absent. But why is the solute potential low? phloem sieve tubes have sucrose, which lowers the water potential, so the sucrose potential should be higher right? Thanks...
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