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  1. I

    *Biology Paper 5 tips*

    to find the value of X^2 for the chi squared test.. you add up all the (O-E)^2 / E values and divide it by what? n+1?
  2. I

    *Biology Paper 5 tips*

    Ohh. isn't that the standard deviation? showing how it disperses about the mean? (+/-)
  3. I

    *Biology Paper 5 tips*

    no bio and chem.
  4. I

    *Biology Paper 5 tips*

    what are those?
  5. I

    *Biology Paper 5 tips*

    error bars?!
  6. I

    *Biology Paper 5 tips*

    Your values are switched up. in the marking scheme with a tail is 28. and without is 84. =S soo yeah.
  7. I

    psychology help

    Which studies?
  8. I

    AS Biology P1 MCQs Preparation Thread

    can someone please answer my questionss 1) What to T killer and T helper cells do ? 2) does the loading of sucrose in the phloem seive tube require active transport? or massflow? :S
  9. I

    AS Biology P1 MCQs Preparation Thread

    Dipeptide ; Di means 2. therefore 12^2.
  10. I

    AS Biology P1 MCQs Preparation Thread

    The answer should be C.. 12^2 = 144. whats the answer?
  11. I

    AS Biology P1 MCQs Preparation Thread

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w08_qp_1.pdf 1,3,4 and 6. For question 3 why isnt the answer C? and for question 6 why cant the answer be C? Is it because in glycogen the alpha glucose are linked by 1-4 glycosidic...
  12. I

    AS Biology P1 MCQs Preparation Thread

    With adding more substrate the reaction rate increases in presence of a competitive inhibitor. however in presence of a non competitive inhibitor does the reaction rate decrease? or remain the same??
  13. I

    AS Biology P1 MCQs Preparation Thread

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w06_qp_1.pdf questions 13, 21 and 32!!
  14. I

    AS Biology P1 MCQs Preparation Thread

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_w05_qp_1.pdf questions 23,24 and 37.
  15. I

    AS Biology P1 MCQs Preparation Thread

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w04_qp_1.pdf questions 20,29 and 32 pleasee and 30!
  16. I

    AS Biology P1 MCQs Preparation Thread

    for Q 15 the answer is B because they are talking about Active Transport, in which energy is required. so molecules move from a lower concentration to a higher concentration, AGAINST the concentration gradient (using up energy) .. like climbing up a steep hill. =p
  17. I

    AS Biology P1 MCQs Preparation Thread

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20(9700)/9700_s07_qp_1.pdf please explain questions 3 and 4
  18. I

    AS Biology P1 MCQs Preparation Thread

    Thaaaanks =D
  19. I

    AS Biology P1 MCQs Preparation Thread

    The rate of enzyme catalysed reactions in human cells is regulated. Which of the following may be involved in such regulation? 1 a change in enzyme concentration 2 a change in substrate concentration 3 inhibition by the final product of the reaction A 1 only B 3 only C 1 and 2 only D...
  20. I

    AS Biology P1 MCQs Preparation Thread

    17 When cylinders of potato tissue were immersed in a 0.35mol dm –3 sucrose solution, they showed no change in mass. What will happen when cylinders are immersed in a 0.1moldm –3 sucrose solution? A The pressure potential of the cells will become more positive. B The solute potential of...
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