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

Testing for biological molecules — practice question

A sample mixture of biological molecules was examined using Benedict’s solution and ethanol. Once the tests were completed, the solutions were blue with Benedict’s reagent, biuret and cloudy with ethanol. Which molecules might be present in the mixture?

  • AW, X and Y
  • BW, X and Z
  • CW, Y and Z
  • DX, Y and Z

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