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  1. Komail Sabba'

    A level Biology: Post your doubts here!

    im not sure though if we MUST use the optimum temperature or not.
  2. Komail Sabba'

    A level Biology: Post your doubts here!

    the question said "the solution contained : subtilisin A, and enzyme of optimum temperature of 60C and pH of about 7.0-7.2 buffer solution or so EDTA " something like this
  3. Komail Sabba'

    Biology P51

    what were the suggestions for some of the results not being valid in q2 e? (prenatal alcohol exposure group)?
  4. Komail Sabba'

    A level Biology: Post your doubts here!

    By the way, you should perform the experiment with the same conditions. Not using the results that they gave (in 35C), but in your standard temperature.
  5. Komail Sabba'

    A level Biology: Post your doubts here!

    what were the difficulties in judging when to stop the stopwatch? I wrote that it is difficult to judge when gelatin is fully gone and the dye may dissolve in the solution, so it is difficult to judge transperancy.. was out of my league.
  6. Komail Sabba'

    A level Biology: Post your doubts here!

    repeat the same procedure for the actual solution to find the rate of the enzyme, and compare it to the values of the graph. The corresponding value on the x-axis is the concentration of the solution.
  7. Komail Sabba'

    A level Biology: Post your doubts here!

    five concentrations of subtilisin A ranging from 20um to 100 um temp. constant at 60C pH constant at 7.0 area of plastic sheet constant equal volume of concentrations time to equilibrate the solution in a water bath length of strings (to suspend the sheets) constant that's all i remember
  8. Komail Sabba'

    Biology paper 51 anyone?

    the one with sensory and motor neurones?
  9. Komail Sabba'

    A level Biology: Post your doubts here!

    i did that as well
  10. Komail Sabba'

    Last minute Preparation Tips for [9709] Mechanics (P4/M1)

    I didnt prepare them. I have bio along with mechanics, same day. Ill see if i get time..
  11. Komail Sabba'

    Last minute Preparation Tips for [9709] Mechanics (P4/M1)

    :)
  12. Komail Sabba'

    Biology paper 51 anyone?

    yeah
  13. Komail Sabba'

    Last minute Preparation Tips for [9709] Mechanics (P4/M1)

    Here are the questions upto 2010 chapter-wise. Best of luck, and post your doubts here so we all can benefit:) (these are from the link in my signature)
  14. Komail Sabba'

    Last minute Preparation Tips for [9709] Mechanics (P4/M1)

    Resolving is more reliable though. (to me)
  15. Komail Sabba'

    Biology paper 51 anyone?

    How was the paper? No public discussion please.
  16. Komail Sabba'

    How did Maths 12 go? No discussion

    Q8 part ii is wrong as well. S= a/(1-r) not r-1 and they substituted the value of k instead of r..
  17. Komail Sabba'

    Biology 52 Tips and Guesses!

    The A2 practical skills paper In this case, students must concentrate on planning, data analysis and interpretation and evaluation. They must know about descriptive statistics and also when and how to use two statistical tests: the χ2 test and the t-test. To prepare for this paper, students...
  18. Komail Sabba'

    *Biology Paper 5 tips*

    think of it like this: *as temperature increases, the electron acceptor changes to colorless more quickly; more electron uptake per unit time; rate of light-dependent reaction increases (enzyme activity) *until it reaches a maximum, where the enzymes are denatured; less electrons accepted per...
  19. Komail Sabba'

    How did Maths 12 go? No discussion

    i did a silly mistake there. the second time is 20
  20. Komail Sabba'

    How did Maths 12 go? No discussion

    actually i divided. but i tried to be cool and simplify it further, and turns out i made a stupid mistake xD anyhow, still hoping for an a
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