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JAMB Biology 2010 Question 16

Question 16

Food Substances and Enzymes

When a mixture of a food substance and Benedict's solution was warmed, the solution changed from blue to brick-red. This indicates the presence of

  1. A.fatty acid
  2. B.sucrose
  3. C.amino acid
  4. D.reducing sugar.
Show the answer and explanation

Answer: D (reducing sugar.)

Explanation

Reducing sugars such as glucose reduce the blue copper(II) ions in Benedict's solution to a brick-red precipitate when heated. Sucrose is not a reducing sugar.