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

Testing for biological molecules — practice question

One portion of a sucrose solution is tested for reducing sugars and stays blue, but when a separate portion of the same solution is tested for non-reducing sugars the solution turns red. What accounts for these observations?

  • ADuring the non-reducing sugar test, an acid hydrolyses sucrose to glucose and fructose.
  • BDuring the non-reducing sugar test, sucrose molecules condense into polysaccharides.
  • CThe reducing sugar test converts sucrose into glucose and fructose.
  • DThe reducing sugar test hydrolyses monosaccharides to disaccharides.

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