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JAMB Biology 1991 Question 21

Question 21

Food Substances and Enzymes

The element common to protein, carbohydrate and lipid is

  1. A.hydrogen
  2. B.sulphur
  3. C.nitrogen
  4. D.phosphorus
Show the answer and explanation

Answer: A (hydrogen)

Explanation

All three are made of carbon, hydrogen and oxygen; nitrogen and sulphur occur only in proteins.