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WAEC Biology 2009 Question 9

Question 9

Respiration

The overall reaction in glycolysis can be summarised as

  1. A.C6H12O6 → C3H4O3 + 4H + ATP
  2. B.C6H12O6 → 2C3H4O3 + 4H + 2ATP
  3. C.C6H12O6 → 2C3H4O3 + 4H + ADP
  4. D.C6H12O6 → 2C3H4O3 + 4H + 2ADP
Show the answer and explanation

Answer: B (C6H12O6 → 2C3H4O3 + 4H + 2ATP)

Explanation

Glycolysis splits one glucose into two molecules of pyruvic acid (C3H4O3), releasing hydrogen and a net gain of 2 ATP.