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JAMB Biology 2001 Question 24

Question 24

Food Substances and Enzymes

When specimen X - is mixed with few drops of Iodine solution, the appearance of a blue-black colour confirms that X is

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

Answer: B (starch)

Explanation

Iodine turns blue-black with starch.