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QUESTION 7  

  TOTAL QUESTION 8 [13]

4.2 Reflexes in animals and phototropism in plants are both responses to stimuli.   4.2.1 Give two similarities between the mechanisms involved in each response (2)

4. A person touches a sharp pin.     The diagram shows the reflex arc involved in the response to this stimulus.     Right-click on the following button to open Figure 4.1         4.1.1 Name the parts labelled A, B, C and D.     [partA] [partB] [partC] [partD] (4)

  TOTAL QUESTION 9  [16]

6.2.1 Use the information in the diagram to compare the Davson-Danielli model with the fluid mosaic model. (2)

7.2 The formula below shows Fick’s law. Rate of diffusion = (area of diffusion x difference in concentration) ÷ ( thickness of surface area over which diffusion takes place) Use the information in the formula to explain how the rate of diffusion is affected by asthma. (2)

8.3 Explain what determines the shape of the active site of an enzyme. (1)

8. Proteases are enzymes used in biological washing powders.  

  TOTAL QUESTION 4 [8]