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

Testing for biological molecules — practice question

A student was given a carbohydrate solution. Two portions were taken from it and tests were carried out on each portion, as shown. Which statement accounts for the results?

  • ACondensation reactions occur in sample two to release reducing sugar.
  • BGlycosidic bonds in a polysaccharide have been broken to release reducing sugar.
  • CSample one shows that sucrose is present in the carbohydrate solution.
  • DThe change in colour to a yellow solution shows that glucose is present.

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