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JAMB Biology 2000 Question 21

Question 21

Food Substances and Enzymes

The production of violet colouration, when dilute NaOH solution is added to a solution of food substance, followed by drops of 1% CuSO4 solution while shaking indicates the presence of

  1. A.protein
  2. B.carbohydrates
  3. C.fats
  4. D.reducing sugar.
Show the answer and explanation

Answer: A (protein)

Explanation

This is the Biuret test; a violet colour shows protein.