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

Testing for biological molecules — practice question

A student investigated two milk samples, X and Y, using Benedict’s test. Each milk sample was heated in a water-bath to $100\,^{\circ}\text{C}$ with Benedict’s solution, and the time until the first colour change appeared was recorded. The findings are given in the table. X: 13 s Y: 26 s Which row identifies the biological molecule detected in each milk sample and the milk sample with the greater concentration of this biological molecule?

  • Aglucose; X
  • Bglucose; Y
  • Creducing sugar; X
  • Dreducing sugar; Y

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