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WAEC Biology 2011 Question 32

Question 32

Food Substances and Enzymes

A purple colour was obtained when sodium hydroxide solution and a drop of copper sulphate solution were added to a food substance. The food substance is likely to be a

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

Answer: C (protein.)

Explanation

This is the biuret test; a purple (violet) colour shows protein.