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

Testing for biological molecules — practice question

The diagram illustrates some stages in a laboratory procedure used to detect whether non-reducing sugars are present in a food sample. Several terms are omitted. Step X  Step Y  end colour Z. Which terms are correct for the expected result when the concentration of non-reducing sugar is very low?

  • AX: acid hydrolysis; Y: Benedict’s test; Z: orange
  • BX: Benedict’s test; Y: acid hydrolysis; Z: orange
  • CX: acid hydrolysis; Y: Benedict’s test; Z: green
  • DX: Benedict’s test; Y: acid hydrolysis; Z: green

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