Biology 9700 · AS & A Level · Testing for biological molecules

Testing for biological molecules — practice question

Four sugar solutions were examined using Benedict’s solution. The table shows the colours of the solutions after the test. What is the most appropriate interpretation of the results?

  • Asolution 1: 0.05% reducing sugar; solution 2: 0.5% non-reducing sugar; solution 3: 1.0% reducing sugar; solution 4: 0.1% reducing sugar
  • Bsolution 1: 0.5% reducing sugar; solution 2: 0.0% reducing sugar; solution 3: 1.0% reducing sugar; solution 4: 0.1% reducing sugar
  • Csolution 1: 1.0% reducing sugar; solution 2: 1.0% non-reducing sugar; solution 3: 1.5% reducing sugar; solution 4: 0.5% reducing sugar
  • Dsolution 1: 0.05% non-reducing sugar; solution 2: 0.5% reducing sugar; solution 3: 1.0% non-reducing sugar; solution 4: 0.1% non-reducing sugar

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