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JAMB Biology 1992 Question 14

Question 14

Food Substances and Enzymes

5 cm3 dilute sodium hydroxide solution and 5 cm3 one percent copper sulphate solution are added to a solution of food specimen. The purple colour which is observed shows the presence of

  1. A.glucose
  2. B.starch
  3. C.fat
  4. D.protein.
Show the answer and explanation

Answer: D (protein.)

Explanation

This is the Biuret test: sodium hydroxide and copper sulphate give a purple or violet colour with protein.