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  1. Vounn Rose

    A level Biology: Post your doubts here!

    Yeah. Totally. I am merely confused with the mark allocation. And you solved that. And I also refer to your explanation about the "male without tail won't pass his phenotype to his male offspring if it is sex-linked gene" it's perfect.
  2. Vounn Rose

    A level Biology: Post your doubts here!

    knowitall10 Thank you for your explanation help. I totally get it. =)
  3. Vounn Rose

    A level Biology: Post your doubts here!

    May I know what it means by 9:3:3:1?
  4. Vounn Rose

    A level Biology: Post your doubts here!

    So for part (ii) of the section I just have to write about this?
  5. Vounn Rose

    A level Biology: Post your doubts here!

    Ok. I assumed if the gene is sex-linked, then the ratio of "with tail" to "without tail" in each sex is 1:3, if I have to take into account both types of allele combination for the "without tail" female, which is either X(H)X(N) or X(N)X(N), ( X(H) stands for X chromosome with allele coding for...
  6. Vounn Rose

    A level Biology: Post your doubts here!

    Where is it exactly? Could you bother to send me the link please? Thank you.
  7. Vounn Rose

    A level Biology: Post your doubts here!

    I have one website providing short notes for biodiversity, once you reach the link I am giving you, go to "Classification", http://www.s-cool.co.uk/a-level/biology Otherwise, I don't seem to have a really detailed A-Level guide notes available in Internet. I would recommend you to read over...
  8. Vounn Rose

    A level Biology: Post your doubts here!

    Can anyone help out for this past year question?
  9. Vounn Rose

    Chemistry: Post your doubts here!

    I will try. Your 1st question: The answer is "D", simply divide the number of moles of oxygen by the volume of bleach (in dm^3 unit), as the number of moles of oxygen correspond to the number of moles of NaClO, provided that hydrogen peroxide is in excess 2nd: To answer this, try to write...
  10. Vounn Rose

    A Level Biology: About the Genetics and Allele Dominance

    Hi everyone!! I would like to ask one question from the past year Paper 5. Here's the link, http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w11_qp_53.pdf It is question no. 2, section (a), part (ii), about cross 3 and 4. I attempted the question and referred to the mark...
  11. Vounn Rose

    A level Biology: Post your doubts here!

    The sequence says "glycine - arginine - lysine - serine", so it maybe possible that the sequence of amino acids in the polypeptide is in the reverse order, so that it is "serine - lysine - arginine - glycine ", because it doesn't matter as the polypeptide can be flipped around in the three...
  12. Vounn Rose

    A level Biology: Post your doubts here!

    For q14, the answer scheme provided says "c", but I personally think 1,2 and 3, but no option having such combination there. An enzyme-substrate complex is dismantled when the active site changes shape and repels the substrate before a reaction can be performed in time. For q25, the scheme...
  13. Vounn Rose

    Hi It's Vounn

    Hi everyone my name is Vounn. I'm studying CIE A Levels Pre-Med course and would like to share ideas with everyone here, as much as I will try my best. Nice to meet you all. And have a nice day.
  14. Vounn Rose

    A level Biology: Post your doubts here!

    Hi everyone!! I would like to ask one question from the past year Paper 5. Here's the link, http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20%289700%29/9700_w11_qp_53.pdf It is question no. 2, section (a), part (ii), about cross 3 and 4. I...
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