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2 marksNutrition in Living Organisms

CSEC Biology · May/June 2012 · Paper 2 · Question 1(a)(iii)

Figure 1 illustrates how temperature affects the rate at which the enzyme amylase breaks down starch.

Explain what happens to the enzyme at temperatures above 37 °C.

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Other parts of this question

  1. 1(a)(i)Construct a table to represent the data shown on the graph in Figure 1, using FOUR temperature values from the graph.[4 marks]
  2. 1(a)(ii)Describe the trend in enzyme activity as shown by the graph in Figure 1.[3 marks]
  3. 1(b)Design an experiment to determine the rate at which starch is broken down under different pH conditions.[5 marks]
  4. 1(c)(i)Name TWO parts of the human digestive system where amylase may be found.[2 marks]
  5. 1(c)(ii)Explain why the digestion of starch stops when food reaches the stomach.[2 marks]
  6. 1(c)(iii)Name an enzyme which works best in the stomach.[1 mark]
  7. 1(d)(i)Amylase is also found in plants. Suggest THREE plant structures in which amylase may be found.[3 marks]
  8. 1(d)(ii)How is the starch produced in leaves converted to a substance which can be transported to other parts of the plant?[2 marks]
  9. 1(d)(iii)Give ONE benefit of the storage of starch in plants.[1 mark]

More practice: the rest of this paper · more Nutrition in Living Organisms questions · all CSEC Biology past papers