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3 marksAspects of Biochemistry

CAPE Biology Unit 1 · 2007 · Paper 2 · Question 1(a)(i)

Table 1 shows the results of food tests conducted on three solutions (X, Y, Z) using Biuret Reagent, Benedict's Solution, and Iodine in Potassium Iodide.

What conclusions can you draw about the contents of the solutions? X: Y:

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Other parts of this question

  1. 1(a)(ii)Briefly explain the colour change recorded for Solution X when treated with Benedict's solution.[2 marks]
  2. 1(b)Suggest how you would determine the concentration of the substance in Solution X if given additional samples.[4 marks]
  3. 1(c)How would you determine the presence of lipid in a liquid foodstuff, using a test-tube based method?[1 mark]

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