TOTAL QUESTION 2 [12]

  QUESTION 5  

5. Dialysis tubing is an artificial membrane, which is similar to the lining of the intestine. A student investigated the diffusion of glucose through dialysis tubing by using the apparatus shown in Fig. 5.1.     Right-click on the blue button to open Fig. 5.1           The student took samples of the water outside the dialysis tubing at 5 minute intervals and tested the samples with Benedict’s solution. The results are shown in Table 5.1.     time/minutes results of the Benedict’s test on the water outside the dialysis tubing 0 blue 5 green 10 yellow 15 red    

2. Fig. 2.1 shows the transfer of materials between blood and tissues.     Right-click on the blue button to open Fig. 2.1      

3.3.4 Describe two effects of adrenaline on the body, other than a change in blood glucose concentration. (2)

1.3.1 Calculate the percentage of women in group 2 in Table 1.1 [A] who died from lung cancer.  Write down your answer for [A] to two significant figures. Show /explain your working (2)

4.2.1 Calculate the percentage decrease in the total number of children admitted to the hospital between 1998 and 2002. Give your answer to the nearest whole number. (show your working) …………………………………………………… % (3)

4.2.2 Health workers in the communities near the hospital were trained in the prevention and treatment of diarrhoea. This affected the total number of children being admitted to the hospital. Use the data in Table 4.1 to suggest the year in which the training took place. Give a reason for your answer. (2)

5.1.2 The student repeated the investigation with a higher concentration of glucose in the dialysis tubing. Predict the results that the student would observe. (1)

39.    The most rapid “saltitory” propagation or “hopping” of an action potential (“nerve impulse”) down an axon occurs only in what type of neurons? a.    myelinated type A and non-myelinated type C neuronsb.    unmyelinated and myelinated type A and B neuronsc.    type C neurons onlyd.    type B neurons onlye.    myelinated type A neurons only