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WAEC Biology 2007 Question 29

Question 29

Food Substances and Enzymes

In a test for non-reducing sugars like sucrose, what is the significance of adding dilute hydrochloric acid to the original sugar solution? To

  1. A.hydrolyse the non-reducing sugar
  2. B.accelerate the rate of the reaction
  3. C.stabilize the medium
  4. D.sterilize the solution
Show the answer and explanation

Answer: A (hydrolyse the non-reducing sugar)

Explanation

Boiling with acid breaks sucrose into glucose and fructose, which are reducing sugars that then react with Fehling's or Benedict's solution.