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Recent content by imissknow2

  1. I

    Biology 12 discussion

    Hey, im a 5th year med student. I take the CIE every 2 years as a gauge so i can better tutor my students. Anyways, i will confirm with my prof again :)
  2. I

    Biology 12 discussion

    The answer would be 1 and 3 . The capillaries are attached DIRECTLY to the wall of the alveoli, a reduction in expansion will not affect the diffusion distance.
  3. I

    Biology 12 discussion

    The answer is symplast as the question mentioned that the water molecules are from the vacuole. So in order to osmosis to another neighbouring cells, the water molecules have to pass through the cell membrane, thus symplast .
  4. I

    A* Grade

    I just found out from my college registrar that the bell curve grading system has been abolished in 2010 last year... now Cambridge is strictly following the percentage grading ie 80 = A etc. It seems more easy for you to loss the A now if somehow you slipped a little during a paper ..
  5. I

    Biology MCQ thread..!!

    Answer is D Question asked for the FALSE statement. A is correct (optimal temperature) B is correct (denturation of protein) C is correct (increase in pH disrupt bonds such as H-bond, ionic bond in enzyme) D is false (increase in substrate concentration means that more substrate is presence...
  6. I

    Biology MCQ thread..!!

    I would quite confidently say that the answer is B The saturated fats do not have double bonds unlike unsaturated fats. This double bonds allow formation of kinks, which disrupt the orderly pattern of cell membrane arrangement. Thus these kinks in unsaturated fats help increase fluidity. The...
  7. I

    Biology MCQ thread..!!

    Answer to Hassam's qn Answer is C Explanation: Using simple ratio calculation we know that on a 132nm DNA there is 388 pairs of bases calculation : (132/3.4) x 10 = 388 base pairs You know that each amino acid is coded by 3 base pair (codon) so divide 388 by 3 = 129.333= 129 amino acids...
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    Biology MCQ thread..!!

    I do not know which variation are you refering to thus I provide the explanations for all of them. Hope this helps. 9700/11 Winter QN24 answer is C Explanation: mature phloem sieve tube cells are living cells thus have cytoplasm, the presence of end wall is to prevent the sap to flow out in...
  9. I

    Biology MCQ thread..!!

    if the person have a lowest resting heart beat per min, it means that his heart is able to pump the largest amount of blood (oxygenated and deoxygenated) circulating around the body per pump. same goes to the heart beat per minute after sport, the lower the better cause this means that the...
  10. I

    Biology MCQ thread..!!

    The answer to your question is C 400 dipeptide means that the chain is only made up of 2 amino acid. using math permutation calculation the 1st amino acid can be one out of the 20 possible amino acid the second one can also be one of the 20 amino acid. thus by multiplying 20 by 20 ie 20 x 20...
  11. I

    HOW WAS BIOLOGY 42??

    there is no clear diff in photosyn rate at low and high co2 condition because other factors such as light intensity, concentration of RuBP, number of stomata are now becoming the limiting factors difference in rate of photosyn fr 0700 and 1900 is probably due to weather condition eg. cloud...
  12. I

    HOW WAS BIOLOGY 42??

    Yup, tat is why you shud actually answer the question the other way round .. but explaining in the form of ABA Absence will also be accepted as long as the candidate qualify that in the presence of ABA the opposite process occurs
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    A* Grade

    hi ! does this mean that the grading system for the year will be based on the overall performance of the candidates? ie. the grading will be based on a bell shaped graph? if the paper for eg Biology is particularly hard this year it will have a lower gt for A grade ? Thank you :)
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