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JAMB Biology 1979 Question 22

Question 22

Food Substances and Enzymes

A sugar solution was boiled with Fehling's solutions A and B and the colour remained blue. The sugar tested was

  1. A.glucose
  2. B.maltose
  3. C.fructose
  4. D.sucrose
  5. E.lactose.
Show the answer and explanation

Answer: D (sucrose)

Explanation

Sucrose is a non-reducing sugar, so it does not turn Fehling's solution brick-red; the others are reducing sugars.