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JAMB Biology 2011 Question 19

Question 19

Food Substances and Enzymes

I. Test tube containing cane sugar and water
II. Test tube containing cane sugar and dilute acid
III. Test tube containing cane sugar and its degrading enzyme
In which of the test tubes will glucose be detected after complete hydrolysis?

  1. A.I only.
  2. B.I, II and III.
  3. C.I and II only.
  4. D.II and III only.
Show the answer and explanation

Answer: D (II and III only.)

Explanation

Cane sugar (sucrose) is hydrolysed into glucose and fructose by boiling with dilute acid or by the enzyme sucrase. Plain water does not split it.