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

Testing for biological molecules — practice question

A student performed tests on equal volumes of four different solutions to find out whether protein, starch and reducing sugar were present in each one. The results are displayed in the table. Which conclusion can be drawn from these results?

  • ASolution 1 has a lower protein and lower reducing sugar content than solution 2.
  • BSolution 2 has less starch compared to solutions 1, 3 and 4.
  • CSolution 3 has the most protein and the least starch.
  • DSolution 4 has a high reducing sugar content and no starch.

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